Stacked Drying Tumbler Troubleshooting manual

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INDUSTRIAL TUMBLE DRYERS
13/13kg
TROUBLESHOOTING MANUAL
70304901R6
Publication date: March 2013
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Table of
Contents
Section 1 – Safety Information ...............................................................4
Locating an Authorized Service Person ................................................6
Safety Warnings and Decals..................................................................6
Safety Precautions for Servicing Tumble Dryers ..................................6
Section 2 – Introduction ..........................................................................7
Model Identification ..............................................................................7
Serial Plate Location..............................................................................9
Customer Service...................................................................................9
Wiring Diagram.....................................................................................9
How A Tumble Dryer Works ..............................................................10
Section 3 – Troubleshooting..................................................................11
1. Tumble Dryer Does Not Start .....................................................12
2. Motor Does Not Start..................................................................13
3. Motor Overload Protector Cycles Repeatedly ............................14
4. Motor Runs But Cylinder Does Not Turn...................................15
5. Motor Does Not Stop ..................................................................16
6. No Heat Condition (Non-CE and Non-Australian Models)........17
7. Burner Does Not Ignite ...............................................................19
8. Burner Ignites and Goes Out Repeatedly....................................22
9. Burner Does Not Shut Off ..........................................................23
10. Clothes Do Not Dry ....................................................................24
11. Tumble Dryer Overheating .........................................................26
12. Burner Not Burning Properly......................................................27
13. Loading Door Opens During Operation......................................28
14. Cylinder Continues to Spin with Door Open ..............................29
15. Coin Does Not Fall into Coin Vault or Coin Drop Sensor
Does Not Register That Coin Has Been Entered ........................30
16. Cylinder Is “Stained” ..................................................................33
Section 4 – Adjustments ........................................................................34
17. Loading Door Switch ..................................................................34
18. Loading Door Strike....................................................................34
19. Aligning Door Strike...................................................................35
20. Cleaning Coin Drop ....................................................................35
Section 5 – Micro Display Control (MDC) Troubleshooting.............38
Models with BC, BG, BL, BX and BY Control Suffixes
21. Coins Ignored When Entered......................................................38
22. Control Has No Display..............................................................39
23. Door Open Indicator ...................................................................41
24. Motor Will Not Start/Run ...........................................................43
25. Unit Will Not Heat – Gas............................................................47
26. Unit Will Not Heat – Steam (T30 Models Only)........................50
27. Unit Will Not Heat – Electric (T30 Models Only) ....................53
28. Error Codes .................................................................................56
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Gas and Steam Models
Control Circuit Schematic.................................................................57
Control Circuit Connection Diagram ................................................58
Control Box Schematic .....................................................................59
Control Box Connection Diagram ....................................................60
Electric Models
Control Circuit Schematic.................................................................61
Control Circuit Connection Diagram ................................................62
Contactor Box Schematic..................................................................63
Contactor Box Connection Diagram.................................................64
Section 6 – NetMaster Troubleshooting ..............................................65
Models with NC, NJ, NR, NX, NY, ZC, ZR, ZX and ZY
Control Suffixes
29. No Infra-red (IR) Communication ..............................................65
30. Coins Ignored When Entered......................................................66
31. Control Has No Display..............................................................67
32. Door Open Indicator ...................................................................70
33. Motor Will Not Start/Run ...........................................................73
34. Unit Will Not Heat – Gas............................................................79
Section 7 – Hybrid Timer Control Troubleshooting ..........................83
Models with QT, SD and SX Control Suffixes
35. Coins Ignored When Entered......................................................83
36. Control Has No Display – OPL Models .....................................84
37. Display Flashes “dr” With Door Closed – OPL Models ............87
38. Vend Satisfied, No In Use LED – Coin Models .........................90
39. In Use LED Lit, No Motor Run – Coin Models .........................94
40. Motor Will Not Start/Run – Coin Models ..................................97
41. Motor Will Not Start/Run – OPL Models.................................102
42. Unit Will Not Heat – Gas – Coin Models.................................107
43. Unit Will Not Heat – Gas – OPL Models .................................110
44. Unit Will Not Heat – Steam – OPL Models
(T30 Models Only)....................................................................113
45. Unit Will Not Heat – Electric Coin (T30 Models Only) ..........115
46. Unit Will Not Heat – Electric OPL (T30 Models Only) ..........119
47. Error Codes ...............................................................................123
Section 8 – Electronic Control Troubleshooting...............................124
Models with KC, KX, KY, LC, LX, LY, WC, WX and
WY Control Suffixes
48. No Infrared CommunicationL and W Control
Suffixes Only ............................................................................125
49. Coins Ignored When EnteredL and W Control
Suffixes Only ............................................................................126
50. No Display ................................................................................127
51. “Door Open” Indicator..............................................................129
52. No Start/Run .............................................................................131
53. Unit Will Not Heat – Gas..........................................................133
54. Unit Will Not Heat – Steam......................................................136
55. Unit Will Not Heat – Electric ...................................................138
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56. CE Models No Display .............................................................141
57. CE Models No Start/Run ..........................................................145
58. CE Models Will Not Heat – Electric ........................................150
Section 9 – LED OPL Control Troubleshooting...............................153
Models with EO Control Suffix
59. No Fan and/or Drive Motor Rotation........................................154
60. Stove and Cabinet Limit Errors ................................................157
61. No Display ................................................................................159
62. Airflow Errors ...........................................................................161
63. Fan Motor Centrifugal Switch Error.........................................163
64. Close Door Indication ...............................................................165
65. Moisture Sensor Error...............................................................167
Troubleshooting the Moisture Sensor Circuit ...................................169
66. Troubleshooting at the Control .................................................169
67. Troubleshooting From Control to Slip Ring Assembly ............171
68. Troubleshooting At Slip Ring Assembly ..................................173
69. Troubleshooting From Slip Ring Assembly to Moisture
Sensing Baffle and Basket ........................................................173
70. Troubleshooting from Basket Shaft to Moisture Sensing
Baffle with Machine Basket Removed .....................................173
71. Troubleshooting at the Moisture Sensing Baffles with
Machine Basket Removed ........................................................174
72. Fan Motor Contactor Error .......................................................175
73. Rotation Sensor Error................................................................177
74. Shorted or Open Thermistor .....................................................179
75. Fuses and Transformer Configuration Jumper..........................181
76. Dip Switch/Harness Index Mismatch .......................................182
77. Electronic Control Testing ........................................................183
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Section 1
Safety Information
Throughout this manual and on machine decals, you
will find precautionary statements (“CAUTION”,
“WARNING”, and “DANGER”) followed by specific
instructions. These precautions are intended for the
personal safety of the operator, user, servicer, and those
maintaining the machine.
DANGER
Danger indicates an imminently hazardous
situation that, if not avoided, will cause
severe personal injury or death.
WARNING
Warning indicates a hazardous situation
that, if not avoided, could cause severe
personal injury or death.
CAUTION
In the interest of safety, some general precautions
relating to the operation of this machine follow.
WARNING
• Failure to install, maintain, and/or operate
this product according to the
manufacturer’s instructions may result in
conditions which can produce serious
injury, death and/or property damage.
• Do not repair or replace any part of the
product or attempt any servicing unless
specifically recommended or published
in this Service Manual and that you
understand and have the skills to carry
out.
• Whenever ground wires are removed
during servicing, these ground wires
must be reconnected to ensure that the
product is properly grounded and to
reduce the risk of fire, electric shock,
serious injury, or death.
W006R1
Caution indicates a hazardous situation
that, if not avoided, may cause minor or
moderate personal injury or property
damage.
Additional precautionary statements (“IMPORTANT”
and “NOTE”) are followed by specific instructions.
IMPORTANT: The word “IMPORTANT” is used
to inform the reader of specific procedures where
minor machine damage will occur if the procedure
is not followed.
NOTE: The word “NOTE” is used to communicate
installation, operation, maintenance or servicing
information that is important but not hazard
related.
4
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Safety Information
IMPORTANT INFORMATION: During the
lifetime of a tumble dryer, it may require service.
The information contained in this manual was
written and is intended for use by qualified service
technicians who are familiar with the safety
procedures required in the repair of a tumble dryer,
and who are equipped with the proper tools and
testing equipment.
WARNING
To reduce the risk of electric shock, fire,
explosion, serious injury or death:
• Disconnect electric power to the tumble
dryer before servicing.
• Never start the tumble dryer with any
guards/panels removed.
• Whenever ground wires are removed
during servicing, these ground wires
must be reconnected to ensure that the
tumble dryer is properly grounded.
NOTE: The WARNING and IMPORTANT
instructions appearing in this manual are not meant
to cover all possible conditions and situations that
may occur. It must be understood that common
sense, caution and carefulness are factors which
CANNOT be built into this tumble dryer. These
factors MUST BE supplied by the person(s)
installing, maintaining or operating the tumble
dryer.
Always contact your dealer, distributor, service agent
or the manufacturer on any problems or conditions you
do not understand.
W240R1
WARNING
Repairs that are made to your products by
unqualified persons can result in hazards
due to improper assembly or adjustments
subjecting you, or the inexperienced
person making such repairs, to the risk of
serious injury, electrical shock, or death.
W007
CAUTION
If you or an unqualified person perform
service on your product, you must assume
the responsibility for any personal injury or
property damage which may result. The
manufacturer will not be responsible for
any injury or property damage arising from
improper service and/or service
procedures.
W008
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Safety Information
Locating an Authorized Service
Person
Manufacturer is not responsible for
personal injury or property damage resulting from
improper service. Review all service information
before beginning repairs.
Warranty service must be performed by an
authorized technician, using authorized factory
parts. If service is required after the warranty
expires, manufacturer also
recommends contacting an authorized technician
and using authorized factory parts.
Safety Warnings and Decals
SAFETY WARNINGS and decals have been provided
in key locations to remind you of important precautions
for the safe operation and maintenance of your tumble
dryer. Please take the time to review these warnings
before proceeding with service work.
All decals have been designed and applied to withstand
washing and cleaning. Decals should be checked
periodically to be sure they have not been damaged,
removed, or painted.
6
Safety Precautions for Servicing
Tumble Dryers
Prior to servicing tumble dryer:
• Disconnect electrical service and “lockout” to
prevent unintentional connection.
• Shut off supply gas valve.
• Allow machine to cool prior to servicing.
After servicing tumble dryer:
• Control/access panels must be reinstalled.
• Motor/drive/belt guards must be reinstalled.
• Contactor/junction/accessory box covers must
be reinstalled.
• Use a non-corrosive leak detection solution to
check all pipe connections for gas leaks. DO
NOT USE AN OPEN FLAME TO CHECK
FOR GAS LEAKS!
• The loading door switch, lint door switch and
airflow switch must be operating properly.
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Section 2
Introduction
Model Identification
Information in this manual is applicable to these models.
Gas
Steam
T30
CHD30STG2-CAT30L
CHD30STG2-CAT30N
CHD30STG2-CTT30L
CHD30STG2-CTT30N
CHD30STG2-CUT30L
CHD30STG2-CUT30N
CKT30N
DR335
DR335G2-BKT30N
DRST30G2-BAT30L
DRST30G2-BAT30N
DRST30G2-BTT30D
DRST30G2-BTT30L
DRST30G2-BTT30N
DRST30G2-BUT30L
DRST30G2-BUT30N
GAT30L
GAT30N
GKT30N
GTT30L
GTT30N
GUT30L
GUT30N
HAT30L
HAT30N
HKT30N
HTT30D
HTT30L
HTT30N
HUT30L
HUT30N
IPD30STG2
ITT30L
ITT30N
KAT30L
KAT30N
KKT30N
KTT30L
KTT30N
KUT30L
KUT30N
LAT30L
LAT30N
LKT30N
LTT30L
LTT30N
LUT30L
LUT30N
MTT30N
NTT30N
PAT30L
PAT30N
PKT30N
PTT30L
PTT30N
PUT30L
PUT30N
SAT30L
SAT30N
SKT30N
STT30D
STT30L
STT30N
SUT30L
SUT30N
UAT30L
UAT30N
UKT30N
UTT30L
UTT30N
UUT30L
UUT30N
T45
CKT45N
CTT45L
CTT45N
DR445G2-BAT45L
DR445G2-BAT45N
DR445G2-BKT45N
DR445G2-BTT45D
DR445G2-BTT45L
DR445G2-BTT45N
DR445G2-BUT45L
DR445G2-BUT45N
DRST45G2-BAT45L
DRST45G2-BAT45N
DRST45G2-BTT45D
DRST45G2-BTT45L
DRST45G2-BTT45N
DRST45G2-BUT45L
DRST45G2-BUT45N
GAT45L
GAT45N
GKT45N
GTT45L
GTT45N
GUT45L
GUT45N
HAT45L
HAT45N
HKT45N
HTT45D
HTT45L
HTT45N
HUT45L
HUT45N
IPD45STG2
ITT45L
ITT45N
KAT45L
KAT45N
KKT45N
KTT45L
KTT45N
KUT45L
KUT45N
MTT45N
NTT45N
SAT45L
SAT45N
SKT45N
STT45D
STT45L
STT45N
SUT45L
SUT45N
UAT45L
UAT45N
UKT45N
UTT45L
UTT45N
UUT45L
UUT45N
CHD30STS2-CTT30S
CHD30STS2-CUT30S
DRST30S2-BTT30S
DRST30S2-BUT30S
GTT30S
GUT30S
HTT30S
HUT30S
IPD30STS2
ITT30S
KTT30S
KUT30S
LTT30S
LUT30S
PTT30S
PUT30S
STT30S
SUT30S
UTT30S
UUT30S
Not Applicable
Electric
CHD30STE2-CTT30E
CHD30STE2-CUT30E
DRST30E2-BTT30E
DRST30E2-BUT30E
GTT30E
GUT30E
HTT30E
HUT30E
IPD30STE2
ITT30E
KTT30E
KUT30E
LTT30E
LUT30E
PTT30E
PUT30E
STT30E
SUT30E
UTT30E
UUT30E
Not Applicable
See next page for Control Suffixes
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Introduction
Includes models with the following control suffixes:
3O – DX4 OPL
3V – DX4 vended
3X – DX4 prep for coin
BC – basic electronic, coin
BG – basic electronic, OPL mode
BL – basic electronic, central pay
BX – basic electronic, prep for coin
BY – basic electronic, prep for card
DO – DMP OPL
DV – DMP vended
DX – DMP prep for coin
8
EO – LED OPL
KC – single coin
KX – prep for coin
KY – prep for card
LC – network adaptable coin
LX – network adaptable, prep for coin
LY – network adaptable, prep for card
NC – NetMaster coin
NJ – micro, prep single card reader
NR – NetMaster card
NX – NetMaster, prep for coin
NY – NetMaster, prep for card
QT – dual digital timer
SD – single drop
SX – single drop, prep for coin
WC – network ready coin
WX – network ready, prep for coin
WY – network ready, prep for card
ZC – NetMaster network coin
ZR – NetMaster network card
ZX – NetMaster network, prep for coin
ZY – NetMaster network, prep for card
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Introduction
Serial Plate Location
When calling or writing for information about your
product, be sure to mention model and serial numbers.
Model and serial numbers are found on the serial plate
on the rear of the machine and inside the upper loading
door hinge.
1
TMB1974N
1
Serial Plate
Customer Service
Wiring Diagram
If literature or replacement parts are required, contact
the source from which the machine was purchased.
The wiring diagram is located inside the contactor or
junction box.
The wiring diagram part number is located in the lower
portion of the electrical data on the serial plate.
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Introduction
How A Tumble Dryer Works
A tumble dryer uses heated air to dry loads of laundry.
1
When the motor is started, the exhaust fan pulls
room temperature air in through the air intake at
the rear of the tumble dryer and over the heat
source (burner flame for gas, heating element for
electric, and coil for steam).
2
The heated air moves into the cylinder, where it is
circulated through the wet load by the tumbling
action of the cylinder.
3
The air then passes through the lint filter, exhaust
fan, and is vented to the outdoors.
1
2
3
T002CE3A
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Section 3
Troubleshooting
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
IMPORTANT: Refer to wiring diagram for aid in
testing tumble dryer components.
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Troubleshooting
1. Tumble Dryer Does Not Start
Tumble Dryer
does not start
Is motor
relay
inoperative?
Yes
Test relay and
replace if
necessary.
Is the
PUSH-TO-START
button not properly
activated (Manual
Timer Models)?
Yes
No
Is
loading door
open?
Close loading
door
completely.
Yes
No
Is
drying timer in
an off position
(Manual Timer
Models)?
Turn drying
timer on.
No
Is there an
incorrect
amount of coins
inserted into
coin drop?
Yes
Check that
proper amount
of coins are
inserted.
Check power
supply, or
replace fuses.
Yes
Close and
lock lint
panel.
No
Is
there a
blown fuse
on tumble
dryer?
Yes
Yes
No
Is the lint
panel
open?
No
Is coin drop
inoperative?
No
Is the
electrical power
off or circuit
breaker or fuse
blown?
Yes
Press and
hold
PUSH-TOSTART button
for three
seconds.
Yes
Check fuse
(in junction box)
and replace if
necessary.
Test coin drop
and replace if
inoperative.
No
TMB19102SR1
TMB1902SR1
12
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Troubleshooting
2. Motor Does Not Start
Motor does
not start
Is the
electrical power
off or circuit
breaker fuse
blown?
Is there
broken, loose,
or incorrect
wiring?
Yes
Refer to wiring
diagram.
No
Yes
Check power
supply, or replace
fuses.
Is
the fan or fan
motor
binding?
Yes
Replace fan or
motor assembly.
No
No
Is the
loading door
switch or lint
panel switch not
closed or switch
inoperative?
Yes
Close door, panel
or test switch and
replace if
inoperative.
Yes
Refer to Adjustments
Section for door
switch adjustment.
Is the
transformer
inoperative?
Yes
Test and replace if
necessary.
Yes
Test relay and replace
if inoperative.
No
No
Is the start
circuit not
complete?
Replace cylinder,
bearing, rollers, or
motor assembly.
Yes
No
No
Is the
door switch
improperly
adjusted?
Is the
cylinder or
cylinder motor
binding?
Yes
Press and hold
PUSH-TO-START
button for three
seconds.
Is the
motor relay
inoperative?
No
No
Is the motor
inoperative?
No
Yes
Have motor tested
and replace if
inoperative.
Is the
airflow switch
inoperative? (Only
on manual timer and
rotary coin
drop.)
Yes
Test switch,
replace or adjust
as required.
TMB1903S
TMB1903S
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Troubleshooting
3. Motor Overload Protector Cycles Repeatedly
Motor Overload
Protector
Cycles
Repeatedly
Yes
Is voltage
correct?
No
Is clothes
load too
large?
Yes
Refer to
Installation
Manual for
electrical
requirements.
Remove part of
load.
No
Is clothes
cylinder
binding?
Yes
Check cylinder
for binding.
No
Check with
local power
company to
ensure that
wiring is
adequate.
Yes
Is wiring
adequate?
No
Yes
Is make-up
air adequate?
No
Is
there lint
buildup around
tumble dryer or poor
maintenance?
No
Refer to
Installation
Manual for
make-up air
requirements.
Clean lint
accumulation
on and around
the motors.
Yes
Is there
broken, loose
or incorrect
wiring?
Yes
Refer to wiring
diagram.
TMB1904S
TMB1904S
14
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Troubleshooting
4. Motor Runs But Cylinder Does Not Turn
Motor Runs
But Cylinder
Does Not Turn
Is cylinder
belt
broken?
Yes
Replace
cylinder belt.
Yes
Check cylinder
for binding.
No
Is cylinder
binding?
TMB1905S
TMB1905S
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Troubleshooting
5. Motor Does Not Stop
Motor Does
Not Stop
Is the door
switch or lint
drawer switch
not working
properly?
Yes
Test switches
and replace if
inoperative.
No
Is coin drop
not working
properly?
Yes
Test coin drop
and replace if
inoperative.
No
Is wiring
incorrect?
Yes
Refer to wiring
diagram.
No
Is electronic
control
inoperative?
Yes
Replace
electronic
control.
Yes
Test relay and
replace if
inoperative.
No
Is motor
relay
inoperative?
TMB1906S
TMB1906S
16
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Troubleshooting
6. No Heat Condition (Non-CE and Non-Australian Models)
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
Ignition Control Module Function
There are four components to the ignition system: the
module, the spark igniter, the high voltage cable and
ground wire. When 24 VAC is applied between the TH
and GND terminals on the module, the module will
send the high voltage signal to the igniter and 24 VAC
to the gas valve coils. Gas will hit the sparking igniter
and flame will be established. The igniter being
engulfed in flame will create a millivolt electric signal
that is sent back to the module by the high voltage
cable; this is what the module sees as flame
recognition. If the millivolt signal is not at the module
in ten seconds, the module will go into safety lockout.
The voltage will be cut from the igniter and gas valve
coils and will not be restored until voltage is cycled at
the module.
Intermittent Heat Test Procedure
On ignition control modules with date codes higher
than 08t2, perform the following test.
Start the tumble dryer and run for 10 minutes (verify
that the tumble dryer is heating properly). After the 10
minute cycle, re-start the tumble dryer and once again
verify the unit is heating. Repeat this procedure 3 times.
If the tumble dryer passes this test, the ignition control
module is operating properly and SHOULD NOT be
changed. Refer to Troubleshooting Manual for
additional service procedures.
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Troubleshooting
6. No Heat Condition (continued)
Is the Ignition Control
Module’s red light on?
No
Refer to
Paragraph 7.
Yes
Does the igniter
spark?
No
Is there
24 volts AC between
the TH and GND terminals
on the module?
No
Refer to Paragraph 7
for heat circuit
troubleshooting.
No
Check wiring between
gas valve and module.
If wiring is good,
replace module.
Yes
Yes
Replace igniter and high
voltage lead. Retest unit. If
unit still does not spark,
replace module.
Does the igniter
spark but no
flame is produced?
Yes
Is there
24 volts AC at the gas
valve coils when igniter
is sparking?
Yes
No
Verify that gas is supplied
to the machine. If gas and
voltage are present,
replace gas valve or coils.
Does the flame turn
off after igniter
stops sparking?
No
Replace module.
Yes
Is the igniter
positioned properly
in the flame, and does the
flame look good?
No
Adjust position of
igniter and retest.
Yes
Is there continuity
between GND terminal on
module and machine?
No
Verify machine is
properly grounded.
Yes
Replace igniter and
high voltage lead.
Retest unit. If it still
does not sense flame,
replace module.
TMB2395S
18
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Troubleshooting
7. Burner Does Not Ignite
Burner Does
Not Ignite
Is there
an improper or
inadequate exhaust
system?
Is
stove limit
thermostat 2
inoperative?
Yes
Refer to
Installation
Manual for
exhaust system
requirements.
Is
there an
insufficient gas
supply?
No
Are there
blown fuses or
Yes
tripped circuit breakers
in external electric
supply line?
No
Check fuses or
circuit breaker.
No
No
Is
drying
selector in the
“Cool Down”
portion of
cycle?
Yes
Reset switch on
microprocessor.
Are the
orifices
incorrect?
No
Yes
Test thermostat 2
and replace if
inoperative.
Open partially closed
gas shut-off valve, or
correct low gas
pressure. Check
manifold pressure
and adjust to
Yes
pressure specified on
serial plate. If
pressure cannot be
obtained, have your
local gas company
check main gas
pressure.
Tumbler is equipped
for type of gas
specified on serial
Yes
plate. If orifices are
different from that
specified on serial
plate, obtain and
install correct orifices.
No
Is
the cabinet
thermostat
inoperative?
Yes
Test thermostat
and replace if
inoperative.
Is there
lint
buildup?
Yes
No
Clean lint
compartment. Check
damper for lint
accumulation. Check
ductwork for lint
buildup.
No
Is
stove limit
thermostat 1
inoperative?
Yes
Test thermostat 1
and replace if
inoperative.
Is there
inadequate
ductwork and
make-up
air?
No
No
Yes
Refer to Installation
Manual to ensure
that ductwork and
make-up air
openings are sized
accurately.
Continued on
next page
TMB1907S-A -
TMB1907S-a
70304901R6
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Troubleshooting
7. Burner Does Not Ignite (continued)
Continued from
previous page
Is the IEI
control
inoperative?
Is there an
improper igniter to
burner
clearance?
Yes
Refer to
Paragraph 43.
Are valve coils
inoperative?
Check valve
coils and
replace if
necessary.
Yes
No
Is
there a blown
fuse on
tumbler?
Check fuse
(located in
control box)
and replace if
necessary.
Yes
No
Is
Gas shut-off
valve in the
closed
position?
Yes
Open shutoff valve.
Replace IEI
control.
No
Is
motor switch
inoperative?
No
Yes
Yes
Replace motor.
No
Is there
an inoperative
microprocessor,
accumulator switch
(rotary coin drop) or
C1 relay (timer
models)?
Yes
Test and
replace as
needed.
No
Is
wrong
transformer
configuration
harness
installed?
Yes
Check incoming
voltage and install
correct
configuration
harness.
No
No
Is the
ground wire from
Instant Electronic
Ignition (IEI) board
not connected to
ground
terminal?
No
20
Yes
Connect
ground wire
to ground
terminal.
Is Instant
Electronic
Ignition (IEI)
control in safety
lockout?
Yes
Reset IEI control by
opening and closing
loading door. (NonCE models only)
Reset IEI by
pressing reset
button on back of
unit. (CE models
only)
TMB1907S-b
TMB1907S-B
70304901R6
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Troubleshooting
7. Burner Does Not Ignite (continued)
Continued from
previous page
Is there
an inoperative
microprocessor or
hybrid timer?
Yes
Test and replace
as needed.
No
Is
wrong
transformer
configuration
harness
installed?
Yes
Check incoming
voltage and install
correct
configuration
harness.
No
Is Instant
Electronic
Ignition (IEI)
control in safety
lockout?
Yes
Reset IEI control by
opening and closing
loading door. (NonCE models only)
Reset IEI by
pressing reset
button on back of
unit. (CE models
only)
TMB1907S-c
TMB1907S-C
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Troubleshooting
8. Burner Ignites and Goes Out Repeatedly
Burner Ignites
and Goes Out
Repeatedly
Is
Yes
there excessive
igniter to burner
clearance?
Is there
insufficient
gas
pressure?
Yes
Check gas
supply and
pressure.
Is the
cabinet
thermostat
inoperative?
Yes
Test thermostat
and replace if
inoperative.
No
Is the
exhaust system
improper or
inadequate?
Yes
No
Does
tumble dryer have
improper
orifices?
Yes
No
Is there
broken, loose
or incorrect
wiring?
No
22
No
Is
there inadequate
make-up air?
No
Yes
Refer to
Installation
Manual for
exhaust
system
requirements.
Tumble Dryer is
equipped for
type of gas
specified on serial
plate. If orifices are
different from that
specified on serial
plate, obtain and
install correct
orifices.
Refer to wiring
diagram.
Refer to
Paragraph 43.
Yes
Refer to
Installation
Manual for
make-up air
requirements.
No
Is the
thermistor
inoperative?
Yes
Replace
thermistor.
No
Is the control
heater relay
malfunctioning?
Yes
Replace control.
No
Are the back
draft dampers
locked in close
position?
Yes
Repair damper to
working order.
TMB1908S
TMB1908S
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Troubleshooting
9. Burner Does Not Shut Off
Burner Does
Not Shut Off
Are there
impurities on gas
valve seat,
preventing valve
from closing?
Yes
Replace gas
valve.
No
Is wiring
correct?
Yes
Refer to wiring
diagram.
No
Is control heater
relay
malfunctioning?
Yes
Replace
control.
TMB1909S
TMB1909S
70304901R6
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Troubleshooting
10. Clothes Do Not Dry
Clothes Do Not
Dry
Is there
enough heating
time allocated for
the load?
No
Start cycle again
with enough time to
dry load.
Does
the burner ignite
and go out
repeatedly?
Refer to
Burner Ignites
and Goes Out
Repeatedly
flowchart.
Yes
No
Yes
Is the burner not
igniting?
No
Refer to
Burner Does Not
Ignite flowchart.
Is
the drying
selector
improperly
set?
Set selector
for higher
setting.
Yes
No
Yes
Is there
too much water in
articles being
dried?
Is
the voltage
incorrect?
Yes
Remove excess
water.
No
Is
the clothes
load too
large?
Yes
Remove part of
load. Maximum
load is 30 pound
dry weight (cotton
load) for 30 pound
Tumbler, etc.
No
Is the
exhaust system
improper or
inadequate?
Yes
Refer to Installation
Manual for exhaust
system equirements.
Yes
Refer to Installation
Manual for electrical
requirements.
Yes
Refer to Installation
Manual for make-up
air requirements.
No
Is there
inadequate
make-up
air?
No
Is the
exhaust duct to
the outside
blocked?
Yes
Clean duct to
remove blockage.
No
Continued on
next page
No
TMB2188S-a
TMB2188S-A
24
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Troubleshooting
10. Clothes Do Not Dry (continued)
Continued from
previous page
Is the lint screen
clogged?
Yes
Clean lint screen.
Yes
Adjust damper so it
turns freely.
No
No
Is the thermistor
inoperative?
Is the
exhaust
damper
binding?
Yes
Replace thermistor.
Is the
cylinder speed
too fast?
Yes
Check belt is not
riding on outer
diameter of motor
pulley.
No
No
Is airflow switch
bracket mounted
improperly?
Yes
Check for proper
alignment: make
sure locator pins
are securely in
place and tighten
mounting screws.
TMB2188S-B
TMB2188S-b
70304901R6
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Troubleshooting
11. Tumble Dryer Overheating
Tumble Dryer
Overheating
Does
tumble dryer
have incorrect
main burner
orifices?
Is the
thermistor
sensor
inoperative?
Yes
Obtain and install
correct orifices.
No
Is the
exhaust
damper
binding?
No
Is gas
Yes
pressure too high or
low?
Adjust gas pressure
as specified on
serial plate.
Yes
Refer to Installation
Manual for make-up
air requirements.
No
Is there
lint buildup?
Yes
Clean lint
compartment. Check
damper for lint
accumulation. Check
ductwork for lint
buildup.
No
Is the
exhaust system
restricted or
inadequate?
No
Yes
Remove obstruction
or lint build up from
exhaust ductwork.
Refer to Installation
Manual for exhaust
system
requirements.
Yes
Adjust damper
so it turns
freely.
No
Is the
control heater
relay
malfunctioning?
No
Is the
make-up air
inadequate?
Yes
Check wiring to
ensure thermistor
is connected.
Replace
thermistor if
necessary.
Remove lint buildup on thermistor.
Yes
Replace control.
No
Are
the safety
covers missing,
allowing
cool air to enter
tumble
dryer?
Yes
Replace covers.
No
Is the
lint screen
clogged with
fabric
softener?
Yes
Replace lint
screen.
No
Are there
holes in cabinets
due to foreign
objects?
Yes
Repair/replace
cabinet
components.
TMB1911S
TMB1911S
26
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Troubleshooting
12. Burner Not Burning Properly
Burner Not Burning
Properly
Is there lint/dirt in
burner tube?
Yes
Disassemble
burner and
blow out lint/dirt.
No
No
Yes
No
Is the
exhaust duct
restricted or
blocked?
Yes
Replace airflow
switch.
No
Is the gas
Yes
pressure too high
or low?
Does
the tumbler have
incorrect
orifices?
Is
the airflow
switch not
functioning
properly?
Yes
Check serial
plate on back of
tumbler for
correct gas
pressure.
Tumbler is equipped
for the type of gas
specified on serial
plate. If orifices are
different from that
specified on serial
plate, obtain and
install correct
orifices.
Is there
inadequate
make-up
air?
Yes
Refer to
Installation Manual
for make-up air
requirements.
No
Is there lint buildup
around gas valve
spud?
Yes
Clean off lint.
Disassemble
and clean
exhaust system.
No
TMB2189S
70304901R6
TMB2189S
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Troubleshooting
13. Loading Door Opens During Operation
Loading Door
Opens During
Operation
Is
tumble dryer
improperly
leveled?
Yes
Refer to Installation
Manual for leveling
leg adjustment.
Yes
Remove part of load and
restart tumble dryer.
No
Is clothes
load too
large?
No
Is loading
door strike
adjusted
incorrectly?
Yes
Refer to
Adjustments
Section for strike
adjustment.
TMB1913S
TMB1913S
28
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Troubleshooting
14. Cylinder Continues to Spin with Door Open
Cylinder
Continues To
Spin With Door
Open
Is relay
inoperative?
NOTE: All tumble dryer panels must be in place and on the
machine for proper operation.
Yes
Replace relay
in control box.
TMB1914S
TMB1914S
70304901R6
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Troubleshooting
15. Coin Does Not Fall into Coin Vault or Coin Drop Sensor Does Not Register
That Coin Has Been Entered
Coin Does Not Fall
Into Coin Vault or Coin
Drop Sensor Does Not
Register That Coin
Has Been Entered
Is proper
electrical
power
supplied to
coin drop?
No
Yes
Is
machine
level?
No
Incorrect electrical
connection may
prevent coins from
registering in coin drop.
Refer to wiring
diagram.
Machines that are not
level may prevent coins
from following through
required check stages
of drop. Refer to
Installation Manual
for instructions on
leveling machine.
Yes
Is coin
drop
clean?
No
Residue or lint build-up
may prevent coins from
following through
required check stages
of drop. Clean coin
drop.
Yes
Is sensor
operative?
No
Replace coin drop
sensor.
TMB1915S
TMB1915S
IMPORTANT: Never use oil to correct coin drop problem. Oil residue will prevent coins from rolling
properly.
IMPORTANT: Do not bend or damage mechanical parts within coin drop.
30
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Troubleshooting
Troubleshooting Coin Drop
Replace Tension Spring
If coin drop is not accepting coins, perform the
following:
1. Move tension spring downward until cover catch
is free. Refer to Figure 3.
1. Clean coin drop. Refer to Paragraph 20.
2. On electronic coin drops with an old-style
tension spring (shown in Figure 1 and Figure 3),
test and replace tension spring using the
following instructions.
Tension Spring
Remove Coin Drop From Machine
1. Disconnect electrical power to machine and drop.
2. Remove coin drop from machine.
1. Push coin return button to open and close coin
drop cover to clear possible coin jams. Refer to
Figure 1.
Coin Drop
Cover
Coin Return
Button
DRY2088N
Cover Catch
Test Tension Spring
DRY2088N
Figure 3
2. Open cover for coin drop.
3. Place a small flathead screwdriver under right
side of tension spring and lift up. Refer to
Figure 4.
Small Flathead
Screwdriver
Tension Spring
MIX7B
MIX7B
Figure 1
2. Manually hold down coin drop cover and insert
coin. Refer to Figure 2.
Left Tab
Right Side of
Tension Spring
MIX2B
MIX2B
Figure 4
Coin Drop
Cover
MIX6B
4. Use screwdriver to move spring approximately
3 mm to left.
5. Lift spring over left tab. Refer to Figure 4.
6. Rotate spring clockwise, 40 to 60 degrees, until it
is free from right tabs. Refer to Figure 5.
MIX6B
Figure 2
3. If coin drop now operates properly, replace
tension spring using instructions on following
pages.
Tabs
Center Tab
MIX3B
MIX3B
Figure 5
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Troubleshooting
7. Use screwdriver to remove spring from center
tab. Refer to Figure 5.
8. Lift spring, with attached clip, off drop.
9. Remove clip from spring. Refer to Figure 6.
13. Lift spring gently to place in position under left
tab.
14. Push spring to right until it snaps into position.
Refer to Figure 4.
15. Close coin drop cover.
16. Move tension spring over cover catch. Refer to
Figure 3.
Reinstall Coin Drop Into Machine
Clip
MIX4B
MIX4B
Figure 6
10. Attach clip to new tension spring, Part No. 209/
00598/02.
11. Place clip, installed on spring, in slot on coin
drop. Refer to Figure 7.
Slot
MIX8B
1. Reinstall coin drop into machine.
2. Reconnect electrical power to machine and drop.
3. Add a coin to drop to verify that coin drop is
operating properly and that electrical connection
is working properly.
MIX8B
Figure 7
12. Use a small flathead screwdriver to push spring
under center tab. Refer to Figure 8.
Center
Tab
Small Flat
Screwdriver
Left Tab
MIX5B
MIX5B
Figure 8
32
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Troubleshooting
16. Cylinder Is “Stained”
Over time, the cylinder and cylinder backs of tumble
dryers can become “stained” from various melted
fabrics. These discolored areas can be removed by
scrubbing the inside of the cylinder with cleaner and a
cleaning pad, such as Scotch- Brite®.
IMPORTANT: Do not use a steel wool pad to clean
the cylinder. Steel wool can damage your machine.
Galvanized Cylinders
For galvanized cylinders, use an all-purpose cleaner
(such as 409®) and a cleaning pad (such as ScotchBrite®) to clean the inside of the cylinder.
Stainless Steel Cylinders
For stainless steel cylinders, use a heavy duty powder
cleanser (such as Zud®) and a cleaning pad (such as
Scotch- Brite®) to clean the inside of the cylinder.
1. Using a water spray bottle, wet the cylinder and
cylinder back.
2. Sprinkle cleanser onto the pad and scrub the
discolored areas.
3. Repeat steps 1-2 as necessary.
4. Thoroughly wipe the entire cylinder after
cleaning to insure the cleanser has been removed.
1. Spray the cleaner on the discolored areas and let
soak for a few minutes.
2. Using the pad, scrub the areas until the
discoloration is removed.
3. Repeat steps 1-2 as necessary.
4. Thoroughly wipe the entire cylinder after
cleaning to insure the cleaner has been removed.
70304901R6
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Section 4
Adjustments
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
17. Loading Door Switch
switch actuator OUTWARD and repeat steps
“a” and “b”.
The door switch should be adjusted so the
cylinder stops when door is opened 2 inches
(51 mm), plus or minus 1/4 inch (6 mm). The
switch is normally open and is closed when the
door is closed. If adjustment is needed, proceed
as follows: Refer to Figure 9.
18. Loading Door Strike
Refer to Figure 9.
a. Close door and start tumble dryer. Slowly
open loading door. Cylinder and heat system
should shut off when door is open 2 inches
(51 mm), plus or minus 1/4 inch (6 mm).
b. Slowly close loading door. When door is
2 inches or less from being fully closed, the
switch actuator on the door should contact the
switch plunger and depress it enough to close
the switch with an audible “click”.
c. If switch actuator does not depress the switch
plunger enough to operate the switch, bend
The door strike must be adjusted so that sufficient
tension holds loading door closed against the
force of a load tumbling against it. The door is
properly adjusted when 8-15 lbs. (3.60-6.75 kg)
of pull is required to open door.
If adjustment is needed, follow these steps:
a.
b.
c.
d.
Open loading door.
Loosen jamnut.
Turn door strike screw in or out as required.
Retighten jamnut.
.
Loading
Door
Switch
Actuator
Jamnut
Door Strike
Screw
T280SE3C
DRY2088N
Figure 9
34
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Adjustments
19. Aligning Door Strike
If the door acorn nut is breaking or the door catch
is prematurely wearing (refer to Figure 9), a door
adjustment may be necessary to align the two
striking surfaces.
(2) Open cover for coin drop. Refer to
Figure 11.
Cover
a. Visually check door strike to catch position to
determine if door is striking low or high.
b. Make sure the door frame to the tumble dryer
hinge mounting screws are secure.
c. To adjust the strike position slightly, loosen
both hinge hex bolts until the door frame can
be moved. If the door is striking low, lift up
on the door and while maintaining pressure
tighten both hinge bolts. If the door is striking
high, push down on the door and while
maintaing pressure tighten both hinge bolts.
Re-check strike position and repeat until
position is correct.
DRY2089N
Figure 11
20. Cleaning Coin Drop
NOTE: The coin drop should be cleaned once a
year. Clean the drop more often if it is exposed to
high levels of residue or lint build-up.
Coin Drops with New-Style Spring
(refer to Figure 12):
a. Disconnect electrical power to machine and
drop.
b. Remove coin drop from machine.
c. Check the spring style of coin drop.
Coin Drops with Old-Style Spring
(refer to Figure 10):
(1) Move spring downward until cover catch is
free. Refer to Figure 10.
Spring
NOTE: Do not lift or overbend the spring in any
direction.
DRY2404N
Spring
Figure 12
(3) Open cover of coin drop. Refer to
Figure 13.
DRY208
Catch
DRY2088N
Figure 10
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Adjustments
NOTE: Do not overbend the spring by opening
cover too far.
Spring
DRY2405N
New-Style Spring Coin Drop
DRY2405N
DRY2408N
Figure 15
DRY2408N
Figure 13
e. Clean residue from coin rail with an alcohol
moistened cloth. Refer to Figure 16.
d. Clean the coin path with a soft brush and wipe
exposed surfaces with an alcohol moistened
cloth. Refer to Figure 14 or Figure 15.
Alcohol
Moistened
Cloth
DRY2090N
DRY2406N
Figure 16
Old-Style Spring Coin Drop
DRY2090N
Figure 14
36
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Adjustments
f. Clean light sensors with a soft brush or air
spray duster. Refer to Figure 17.
Light
Sensors
DRY2407N
DRY2407N
Figure 17
g. Close cover for coin drop.
h. Coin Drops with OLD-Style Spring - Move
spring back over cover catch.
i. Reinstall coin drop into machine.
j. Reconnect electrical power to machine and
drop.
k. Add a coin to drop to verify that coin drop is
operating properly and that electrical
connection is working properly.
70304901R6
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Section 5
Micro Display Control (MDC)
Troubleshooting
Models with BC, BG, BL, BX and BY Control Suffixes
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
21. Coins Ignored When Entered
Gas and electric heat.
Single and three phase
power supply.
Start coin drop
diagnostic tests.
Does the display on the
electronic control
increment properly?
YES
Exit diagnostic
testing and reset
control. (Prompting
for vend price)
NO
Reconnect and run
diagnostic test
again.
NO
Reconnect and run
diagnostic test
again.
NO
Is connector H2 on the
control firmly seated in
its receptacle?
YES
Is the 3 pin connector
between coin drop and
control connected
correctly?
YES
Are wires exiting coin
drop optical sensor
cracked or broken?
YES
Replace coin drop
or optic switch.
NO
Replace coin drop.
If problem still exists
then replace the
electronic control.
38
TMB1978S
TMB1978S
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Micro Display Control (MDC) Troubleshooting
22. Control Has No Display
Control has no display
Gas, steam and electric heat.
Single and three phase power supply.
(1)
(6)
Is there voltage across
H1-1 & H1-3 on
the control?
YES
Replace electronic
control.
Is there voltage at
the input of the
secondary fuse?
NO
Correct wiring
between secondary
fuse and
transformer.
YES
NO
(7)
Is there power supplied
to the unit?
NO
Plug unit in and run
it.
YES
Is there voltage at
output side of
secondary fuse?
NO
Replace secondary
fuse.
YES
(2)
Is there voltage at input
of primary fuses?
NO
Correct wiring
between primary
fuse and power
supply.
Correct wiring
between control and
secondary fuse.
YES
(3)
Is there voltage at
output side of the
primary fuses?
NO
Replace primary
fuse(s).
YES
(4)
Is there voltage across
terminals 1 & 2 of
transformer primary?
NO
Correct wiring
between primary
fuse and
transformer.
YES
(5)
Is there voltage across
terminals 1 &
4 of transformer
secondary?
NO
Replace
transformer.
YES
TMB1979S
TMB1979S
Please see following page for wiring diagram information.
70304901R6
39
L2
4
7
SECONDARY
FUSE
MDL-3.5A
250V
6
2
BLK
BLK
RED
RED
RED/WHT
120V
1
N.O.
COM
LT. BLU
4
2
3
RED/WHT
RED/BLU
5
N.O.
COM
LINT
DRAWER
SWITCH
SECONDARY
FUSE
1.25 T
250V
WHT
24V
1.5A
DOOR
SWITCH
3
24V
3.5A
1
250V
AGC-2A
FUSE
PRIMARY
2
RED
RED
N
RED/BLK
RED/BLK
RED/BLK
FS-2
H2-1
H2-2
H2-5
3
2
1
5
H5
6 8
7
9
10 11 12
HEAT RELAY
MOTOR RELAY
COIN DROPS
4
RED
WHT/BLU
DOOR SENSING CIRCUIT ALLOWS
CONTROL TO TURN ON MOTOR
RELAY ONLY WHEN DOOR IS
CLOSED & SWITCH IS PRESSED
VOLTAGE CONFIGURATION INPUT
JUMPER H2-2 TO H2-5 AS FOLLOWS:
24Vac - WIRE JUMPER
120Vac - 6.8K ohm 5 watt
240Vac - 13.6K ohm 10 watt
MDC CONTROL
24Vac
H1-2
2
H6
3 4
5
6
SEE VEND
APPLICATION DETAIL
1
24VAC
H4
10 9
7
6
H3
5
4
7
6
WHT
5
4
3
3
2
2
100 OHM
1/4 watt
1
Door Sense Ret
TEMP. REGULATING
CIRCUIT CONTROLS
HEAT RELAY
8
START PULSE INPUT
H3-1 & H3-2
Iin= 3-30ma
TIME 20msec MIN.
AVAILABLE OUTPUT
H3-3 & H3-4
OPTO OFF WHEN
MACHINE RUNNING
Vmax=28Vdc
Imax=5ma
CONTROL
POWER
SUPPLY
1
H1-1
CONNECTION
24Vac Ret
H1-4
H1-3
24Vac Ret
L1
4N25
SERVICE
FS-1
H2-4
H2-3
H2-6
1
H4
10 9
COM
AIR FLOW
SWITCH
ORG/BRN
WHT
8
TMB1977S
TMB1977S
CABINET
LIMIT
THERMOSTAT
N.O.
N.C.
BRN/RED
CHASSIS GROUND
GRN/YEL
BLK
THERMISTOR
WHT
H11L1
40
WHT/VLT
TB1
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Micro Display Control (MDC) Troubleshooting
Control Has No Display
70304901R6
www.groupdynamics-laundry.com
sales@groupdynamics.lv
Micro Display Control (MDC) Troubleshooting
23. Door Open Indicator
(1)
Gas, steam and electric heat.
Single and three phase
power supply.
Is there voltage at
H2-1 on the Electronic
control?
Reference voltage
checks to transformer
neutral.
YES
Replace control.
NO
(6)
Is there voltage at
the input of the
secondary fuse?
NO
Correct wiring
between secondary
fuse and
transformer.
YES
(7)
Is there power supplied
to the unit?
NO
Plug unit in and run
it.
YES
NO
Replace secondary
fuse.
YES
(2)
Is there voltage at input
of primary fuses?
(8)
NO
Correct wiring
between primary
fuses and power
supply.
YES
Is there voltage at
N.O. of door
switch?
NO
Correct wiring
between N.O. and
output of secondary
fuse.
NO
Check for proper
function of door
switch replace if
necessary.
NO
Correct wiring
between N.O. on lint
drawer and COM on
door switch.
NO
Check for proper
operation replace if
necessary.
YES
(3)
Is there voltage at
output side of the
primary fuses?
(9)
NO
Replace primary
fuse(s).
YES
With door closed is
there voltage to
COM of door
switch?
YES
(4)
Is there voltage across
terminals 1 & 2 of
transformer primary?
(10)
NO
Correct wiring
between primary
fuses and
transformer.
YES
Is there voltage at
N.O. of lint drawer
switch?
YES
(5)
Is there voltage across
terminals 2 & 3 of
transformer
secondary?
YES
Is there voltage at
output side of
secondary fuse?
(11)
NO
Replace
transformer.
Is there voltage at
COM of lint drawer
switch with lint
drawer closed?
YES
Correct wiring
between H2-1 of
electronic control
and COM of lint
drawer switch.
TMB1980S
TMB1980S
Please see following page for wiring diagram information.
70304901R6
41
7
L2
SECONDARY
FUSE
MDL-3.5A
250V
6
2
BLK
BLK
RED
RED
RED/WHT
FUSE
9
1
N.O.
COM
LT. BLU
4
2
4
RED/WHT
N.O.
COM
LINT
DRAWER
SWITCH
11
RED/BLU
10
SECONDARY
FUSE
1.25 T
250V
WHT
24V
1.5A
DOOR
SWITCH
8
3
120V
250V
AGC-2A
24V
3.5A
1
3
PRIMARY
2
RED
RED
N
RED/BLK
RED/BLK
RED/BLK
5
FS-2
H2-1
H2-2
H2-5
3
2
1
5
H5
6 8
7
9
10 11 12
HEAT RELAY
MOTOR RELAY
COIN DROPS
4
RED
WHT/BLU
DOOR SENSING CIRCUIT ALLOWS
CONTROL TO TURN ON MOTOR
RELAY ONLY WHEN DOOR IS
CLOSED & SWITCH IS PRESSED
VOLTAGE CONFIGURATION INPUT
JUMPER H2-2 TO H2-5 AS FOLLOWS:
24Vac - WIRE JUMPER
120Vac - 6.8K ohm 5 watt
240Vac - 13.6K ohm 10 watt
MDC CONTROL
24Vac
H1-2
2
H6
3 4
5
6
SEE VEND
APPLICATION DETAIL
1
24VAC
H4
10 9
7
6
H3
5
4
7
6
WHT
5
4
3
3
2
2
100 OHM
1/4 watt
1
Door Sense Ret
TEMP. REGULATING
CIRCUIT CONTROLS
HEAT RELAY
8
START PULSE INPUT
H3-1 & H3-2
Iin= 3-30ma
TIME 20msec MIN.
AVAILABLE OUTPUT
H3-3 & H3-4
OPTO OFF WHEN
MACHINE RUNNING
Vmax=28Vdc
Imax=5ma
CONTROL
POWER
SUPPLY
1
H1-1
CONNECTION
24Vac Ret
H1-4
H1-3
24Vac Ret
L1
4N25
SERVICE
FS-1
H2-4
H2-3
H2-6
1
H4
10 9
COM
AIR FLOW
SWITCH
ORG/BRN
WHT
8
TMB1981S
TMB1981S
CABINET
LIMIT
THERMOSTAT
N.O.
N.C.
BRN/RED
CHASSIS GROUND
GRN/YEL
BLK
THERMISTOR
WHT
H11L1
42
WHT/VLT
TB1
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Micro Display Control (MDC) Troubleshooting
Door Open Indicator
70304901R6
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Micro Display Control (MDC) Troubleshooting
24. Motor Will Not Start/Run
Note: test conducted with vend
(1) price satisfied and start button
pressed.
Is there voltage across
H2-1 and H2-6 on
the electronic control ?
NO
Gas, electric and steam heat.
Single and three phase power supply.
Refer to Door
Open Indicator
flowchart.
(2)
NO
Replace
control.
Does the fan motor
run?
NO
Correct wiring to coil
of motor relay .
3 phase. Also
see Note on
next page
NO
Replace fan motor.
Single phase
Three phase. Also
see Note on next
page.
(12)
Is the unit equipped
with single phase or
three phase power?
Is there supply voltage
between L2 & L3 of
motor control relay?
Single phase
(4)
NO
Correct wiring
between terminal 5
and power supply.
NO
Replace motor
control relay.
NO
Correct wiring
between L2, L3 and
supply.
YES
(13)
Is there voltage across
terminals L2 & T2 and
L3 & T3?
YES
(5)
Is there voltage at
terminal 8 of motor
control relay?
Correct wiring
between fan motor
and motor control
relay.
YES
Is unit equipped with
single phase or three
phase power supply?
YES
Is there voltage at
terminal 5 of the
motor control relay?
NO
YES
YES
(3)
Is there voltage
across the coil of
the motor control
relay?
(6)
Is there voltage across
terminals 1 & 4 of
the fan motor?
YES
Is there voltage
across H2-4 and H2-6
on the electronic control?
Replace MDC
control.
YES
Replace motor
control relay.
NO
(7)
YES
Is there voltage at
terminal 6 of motor
control relay?
(10)
Is there supply voltage
to L1 and L2 of the
motor control relay?
NO
Correct wiring
between L1, L2 and
power supply.
YES
(11)
Is there votlage across
L1 & T1 and L2 & T2?
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
YES
(8)
Is there voltage at
terminal 9 of motor
control relay?
YES
NO
NO
Replace motor
control relay.
YES
NO
70304901R6
43
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Micro Display Control (MDC) Troubleshooting
24. Motor Will Not Start/Run (continued)
(9)
Is there voltage across
terminals 1 & 4 of
cylinder motor?
NO
Correct wiring
between fan motor
and motor control
relay.
NO
Correct wiring
between cylinder
motor and motor
control relay.
YES
Does the cylinder
motor run?
NO
Replace cylinder
motor.
NO
Replace fan motor.
YES
Motors are
operational.
Single phase
Note: For high voltage three phase supply (380 volts
or higher), the cylinder and fan motors are supplied
by L1, L2, L3 through the motor relay terminals T1,
T2, T3. Make the appropriate adjustments when
doing voltage checks.
Also
n next
NO
YES
NO
NO
Correct wiring
between L2, L3 and
supply.
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
Replace motor
control relay.
TMB1982S
TMB1982S
Please see following 2 pages for wiring diagram information.
44
70304901R6
RED/BLK
RED/BLK
RED/BLK
FS-2
3
H2-1
H2-2
2
1
5
4
H5
6 8
7
COIN DROPS
9
10 11 12
HEAT RELAY
MOTOR RELAY
DOOR SENSING CIRCUIT ALLOWS
CONTROL TO TURN ON MOTOR
RELAY ONLY WHEN DOOR IS
CLOSED & SWITCH IS PRESSED
VOLTAGE CONFIGURATION INPUT
JUMPER H2-2 TO H2-5 AS FOLLOWS:
24Vac - WIRE JUMPER
120Vac - 6.8K ohm 5 watt
240Vac - 13.6K ohm 10 watt
24Vac
H1-2
H2-5
MDC CONTROL
RED
24Vac Ret
1
2
24VAC
H6
3 4
5
6
H4
10 9
7
6
H3
5
4
7
6
WHT
5
4
3
3
2
1
2
100 OHM
1/4 watt
1
FS-1
H2-4
H2-3
H4
10 9
COM
AIR FLOW
SWITCH
ORG/BRN
WHT
8
7
CABINET
LIMIT
THERMOSTAT
N.O.
M
3
4
BRN
5
A
3
7
2
M
1
4
VLT
ORG/
WHT
WHT
WHT
BLK
WHT/
BRN
3
GRN/YEL
STOVE
LIMIT
THERMOSTAT 2
VLT/WHT
FAN MOTOR
CENTRIFUGAL
SWITCH
THERMISTOR
WHT
STOVE
LIMIT
THERMOSTAT 1
BRN/WHT
B
6
WHT
VLT
WHT
N.C.
ORG
BRN/RED
2
CHASSIS GROUND
GRN/YEL
BLK
THERMISTOR
WHT
H2-6
Door Sense Ret
TEMP. REGULATING
CIRCUIT CONTROLS
HEAT RELAY
8
START PULSE INPUT
H3-1 & H3-2
Iin= 3-30ma
TIME 20msec MIN.
AVAILABLE OUTPUT
H3-3 & H3-4
OPTO OFF WHEN
MACHINE RUNNING
Vmax=28Vdc
Imax=5ma
CONTROL
POWER
SUPPLY
H1-1
SEE VEND
APPLICATION DETAIL
H1-4
H1-3
24Vac Ret
WHT/BLU
4N25
1
H11L1
5
4
GND
2
TH
IGN
1
ICM
8
5
BLK
GRY/BLK
3
RUN
1
VALV
GND
3
MAIN 1
THERM
PROT.
5
WHT
BLK
WHT/
6
MAIN 2
AUX
FAN
MOTOR
GND
3
M
5
4
WHT
4
1
7
LT. BLU
FIRST COIL
SECOND COIL
RUN
MAIN 1
THERM
PROT.
8
TB1-L1
9
4
TB1-N
TMB1983S
MAIN 2
AUX
CYLINDER
MOTOR
M
BLK/RED
208-240V
SERVICE
TB1-L2
120V
SERVICE
GAS VALVE
9
6
BLK/RED
BLU/BLK
70304901R6
WHT/VLT
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Micro Display Control (MDC) Troubleshooting
Motor Will Not Start/Run (Sheet 1 of 2)
45
T3
T2
H5
H3
2
SECONDARY
FUSE
MDL-3.5A
250V
HC1
BLK
1
250V
AGC-2A
FUSES
PRIMARY
BLK/
WHT
2
BLK/
WHT
1
3
3
4
1
N.O.
COM
6
4
RED/WHT
RED/BLU
N.O.
COM
LINT
DRAWER
SWITCH
SECONDARY
FUSE
1.25 T
250V
WHT
24V
1.5A
5
DOOR
SWITCH
24V
4.0A
2
SEE
TRANSFORMER
CONFIGURATION
JUMPER
BLK
RED
RED
RED/WHT
RED
RED
HC2
RED/BLK
RED/BLK
RED/BLK
FS-2
H2-1
H2-2
H2-5
3
MDC CONTROL
2
1
5
H5
6 8
7
9
10 11 12
HEAT RELAY
MOTOR RELAY
COIN DROPS
4
RED
WHT/BLU
1
DOOR SENSING CIRCUIT ALLOWS
CONTROL TO TURN ON MOTOR
RELAY ONLY WHEN DOOR IS
CLOSED & SWITCH IS PRESSED
VOLTAGE CONFIGURATION INPUT
JUMPER H2-2 TO H2-5 AS FOLLOWS:
24Vac - WIRE JUMPER
120Vac - 6.8K ohm 5 watt
240Vac - 13.6K ohm 10 watt
24Vac
H1-2
L3
24Vac Ret
1
2
24VAC
H6
3 4
5
6
H4
8
7
6
H3
5
4
7
6
WHT
5
4
3
3
2
2
100 OHM
1/4 watt
1
Door Sense Ret
TEMP. REGULATING
CIRCUIT CONTROLS
HEAT RELAY
10 9
START PULSE INPUT
H3-1 & H3-2
Iin= 3-30ma
TIME 20msec MIN.
AVAILABLE OUTPUT
H3-3 & H3-4
OPTO OFF WHEN
MACHINE RUNNING
Vmax=28Vdc
Imax=5ma
CONTROL
POWER
SUPPLY
H1-1
SEE VEND
APPLICATION DETAIL
H1-4
H1-3
24Vac Ret
L2
4N25
TB1-L3
FS-1
H2-4
H2-3
H2-6
1
WHT
H4
10 9
COM
AIR FLOW
SWITCH
ORG/BRN
WHT
8
7
CABINET
LIMIT
THERMOSTAT
N.O.
VLT
6
M
4
3
14
2
M
3
1
13
WHT
ORG/
WHT
WHT
WHT
BLK
WHT/
BRN
3
11
10
HC2
HC1
FAN MOTOR
CENTRIFUGAL
SWITCH
THERMISTOR
VLT/WHT
STOVE
LIMIT
THERMOSTAT
BRN/WHT
BRN
5
WHT
2
WHT
N.C.
ORG
BRN/RED
CHASSIS GROUND
GRN/YEL
BLK
THERMISTOR
H11L1
TB1-L2
WHT/VLT
5
T1
L1
BLK
GRY/BLK
46
1
M
3
BLK/WHT
4
1
13
RUN
MAIN 1
THERM
PROT.
AUX
MAIN 2
4
LT. BLU
TMB1984S
9
MAIN 2
AUX
5
M
12
6
T3
BLK/RED
CYLINDER
MOTOR
MAIN 1
THERM
PROT.
M
L3
LT. BLU
FAN
MOTOR
RUN
T2
L2
TB1-L3
TB1-L2
TB1-L1
BLU/BLK
TB1-L1
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Micro Display Control (MDC) Troubleshooting
Motor Will Not Start/Run (Sheet 2 of 2)
70304901R6
WHT
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Micro Display Control (MDC) Troubleshooting
25. Unit Will Not Heat – Gas
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
(7)
NO
Is there voltage at
FS-2 of MDC control?
Correct wiring
between FS-2 and
COM of lint drawer.
YES
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
YES
Replace MDC
control.
Replace
thermistor.
(2)
(8)
NO
Is there voltage
at FS-1 of MDC
control?
NO
Is the
thermistor
operational?
YES
Is there voltage across
terminals 3 & 5 of fan motor
centrifugal switch?
NO
(9)
NO
Correct wiring
between COM of
airflow switch and
FS-1 of MDC
control.
Is there voltage to the
input side of the
cabinet limit?
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
YES
YES
(10)
(4)
Is there voltage across
COM & N.C. terminal
of airflow switch?
Replace fan motor.
YES
(3)
Is there voltage at COM
of airflow switch?
YES
YES
Check for proper
function of airflow
switch and replace if
necessary.
YES
Is there voltage across
cabinet limit?
Replace cabinet
limit.
NO
NO
(5)
Is there voltage at
terminal 7 of motor
control relay?
(11)
NO
Correct wiring
between terminal 7
on motor control
relay and N.C.
terminal on airflow
switch.
Is there voltage to the
input side of the stove
limit?
NO
Correct wiring
between stove limit 1
and cabinet limit.
YES
YES
(6)
Is there voltage across
terminals 7 & 4 of
motor control relay?
YES
Replace motor
control relay.
NO
TMB1985S
70304901R6
47
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Micro Display Control (MDC) Troubleshooting
25. Unit Will Not Heat – Gas (continued)
(12)
Is there voltage across
the stove limit 1?
YES
YES
Replace the stove
limit.
NO
Is there gas flow
through the gas valve?
NO
Replace gas valve
coils or complete
gas valve.
NO
Replace high
voltage ignition
cable or igniter.
YES
(13)
NO
Is there voltage to
input side of
stove limit 2?
Correct wiring
between stove limit 1
and stove limit 2.
YES
Does the igniter spark?
YES
(14)
Is there voltage
across stove limit 2?
YES
YES
Replace stove limit 2.
Is there a flame?
Unit operational.
NO
NO
(15)
Is there voltage to
terminal 2 of
the Ignition Control
Module (ICM)?
NO
Correct wiring
between terminal 2
of ICM and stove
limit 2.
YES
Note: Make sure unit is
not in a lock out
condition.
(16)
NO
Is there voltage at
terminal 1 of ICM
board?
Replace ICM board.
YES
(17)
Is there voltage across
the coils of the gas
valve?
NO
Correct wiring
between gas valve
and ICM board.
YES
TMB1985S
TMB1985S
Please see following page for wiring diagram information.
48
70304901R6
RED/BLK
RED/BLK
RED/BLK
FS-2
H2-1
H2-2
3
2
1
5
4
H5
6 8
7
COIN DROPS
9
10 11 12
HEAT RELAY
MOTOR RELAY
DOOR SENSING CIRCUIT ALLOWS
CONTROL TO TURN ON MOTOR
RELAY ONLY WHEN DOOR IS
CLOSED & SWITCH IS PRESSED
24Vac
H1-2
H2-5
MDC CONTROL
VOLTAGE CONFIGURATION INPUT
JUMPER H2-2 TO H2-5 AS FOLLOWS:
24Vac - WIRE JUMPER
120Vac - 6.8K ohm 5 watt
240Vac - 13.6K ohm 10 watt
RED
24Vac Ret
1
2
24VAC
H6
3 4
5
6
H4
10 9
8
7
6
H3
5
4
7
6
WHT
5
4
3
3
2
2
2
100 OHM
1/4 watt
1
Door Sense Ret
TEMP. REGULATING
CIRCUIT CONTROLS
HEAT RELAY
START PULSE INPUT
H3-1 & H3-2
Iin= 3-30ma
TIME 20msec MIN.
AVAILABLE OUTPUT
H3-3 & H3-4
OPTO OFF WHEN
MACHINE RUNNING
Vmax=28Vdc
Imax=5ma
CONTROL
POWER
SUPPLY
H1-1
SEE VEND
APPLICATION DETAIL
H1-4
H1-3
24Vac Ret
WHT/BLU
4N25
1
FS-1
H2-4
H2-3
H2-6
1
H4
10 9
COM
AIR FLOW
SWITCH
ORG/BRN
3
WHT
8
N.O.
CABINET
LIMIT
THERMOSTAT
10
7
WHT
N.C.
ORG
BRN/RED
4
CHASSIS GROUND
GRN/YEL
BLK
THERMISTOR
WHT
H11L1
M
5
4
12
7
2
M
6
1
9
STOVE
LIMIT
THERMOSTAT 1
VLT
A
3
11
BRN
5
BRN/WHT
B
6
WHT
4
VLT
7
3
14
VLT/WHT
GRN/YEL
5
4
GND
2
TH
IGN
8
FAN MOTOR
CENTRIFUGAL
SWITCH
WHT/
BRN
STOVE
LIMIT
THERMOSTAT 2
13
ORG/
WHT
WHT
WHT
BLK
THERMISTOR
WHT
ICM
8
5
3
BLK
GRY/BLK
1
VALV
3
GND
3
GND
15
1
M
RUN
BLK
AUX
5
16
MAIN 2
WHT
WHT/
MAIN 1
THERM
PROT.
FAN
MOTOR
WHT
70304901R6
WHT/VLT
LT. BLU
17
TMB1986S
SECOND COIL
FIRST COIL
GAS VALVE
4
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Micro Display Control (MDC) Troubleshooting
Unit Will Not Heat – Gas
49
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Micro Display Control (MDC) Troubleshooting
26. Unit Will Not Heat – Steam (T30 Models Only)
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
Is there voltage on
FS-2 of MDC control?
(7)
NO
Correct wiring
between FS-2 and
COM of lint drawer.
YES
Replace MDC
control.
Replace
thermistor.
(2)
(9)
NO
Correct wiring
between COM of
airflow switch and
FS-1 of MDC
control.
Is there voltage to the
input side of the
cabinet limit?
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
YES
(10)
(4)
YES
Check for proper
function of airflow
switch and replace if
necessary.
Is there voltage across
cabinet limit?
YES
Replace cabinet
limit.
NO
NO
(5)
Is there voltage on
terminal 7 of motor
control relay?
Replace fan motor.
NO
YES
Is there voltage across
COM & N.C. terminal
of airflow switch?
YES
YES
(3)
Is there voltage on
COM of airflow
switch?
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
YES
Is there voltage across
terminals 3 & 5 of
fan motor centrifugal switch?
NO
Is the
thermistor
operational?
YES
NO
(8)
NO
Is there voltage
on FS-1 of
MDC control?
Is there voltage on
terminal 3 of fan
motor centrifugal switch?
(11)
NO
Correct wiring
between terminal 7
on motor control
relay and N.C.
terminal on airflow
switch.
YES
Is there voltage to the
input side of the stove
limit?
NO
Correct wiring
between stove limit
and cabinet limit.
YES
(6)
Is there voltage across
terminals 7 & 4 of
motor control relay?
YES
Replace motor
control relay.
TMB1987S
NO
50
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Micro Display Control (MDC) Troubleshooting
26. Unit Will Not Heat – Steam (T30 Models Only) (continued)
(12)
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
Is there voltage across
the stove limit?
YES
Replace the stove
limit.
NO
(13)
YES
Is there voltage across
the coil of the steam valve?
NO
Replace fan motor.
Correct wiring
between steam
valve and stove
limit.
YES
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
Does the steam valve
open allowing steam to flow?
No
Replace or rebuild
steam valve.
Unit operational.
YES
NO
Replace cabinet
limit.
Correct wiring
between stove limit
and cabinet limit.
TMB1987S
Please see following page for wiring diagram information.
70304901R6
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Micro Display Control (MDC) Troubleshooting
TMB1988S
1
2
3
9
4
10
5
12
11
6
7
13
8
Unit Will Not Heat – Steam (T30 Models Only)
52
70304901R6
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Micro Display Control (MDC) Troubleshooting
27. Unit Will Not Heat – Electric (T30 Models Only)
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
Is there voltage at
FS-2 of MDC control?
(7)
NO
Correct wiring
between FS-2 and
COM of lint drawer
switch.
YES
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 13 of
motor control relay.
YES
Replace MDC
control.
Replace
thermistor.
(2)
(8)
NO
Is there voltage
on FS-1 of
MDC control?
Is the
thermistor
operational?
YES
Is there voltage across
terminals 3 & 5 of
fan motor centrifugal switch?
NO
NO
(9)
NO
Correct wiring
between COM of
airflow switch and
FS-1 of MDC
control.
YES
Is there voltage to the
input side of the
cabinet limit?
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
YES
(10)
(4)
Is there voltage across
COM & N.C. terminal
of airflow switch?
Replace fan motor.
YES
(3)
Is there voltage at COM
of airflow switch?
YES
YES
Check for proper
function of airflow
switch and replace if
necessary.
NO
Is there voltage across
cabinet limit?
YES
Replace cabinet
limit.
NO
(5)
Is there voltage at
terminal 14 of motor
control relay?
(11)
NO
Correct wiring
between terminal 7
on motor control
relay and N.C.
terminal on airflow
switch.
YES
Is there voltage to the
input side of the stove
limit?
NO
Correct wiring
between stove limit
and cabinet limit.
YES
(6)
Is there voltage across
terminals 13 & 14 of
motor control relay?
YES
Replace motor
control relay.
NO
TMB1989S
70304901R6
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Micro Display Control (MDC) Troubleshooting
27. Unit Will Not Heat – Electric (T30 Models Only) (continued)
Note: Please make
the oppropriate
adjustments if your
unit is single phase.
(12)
Is there voltage across
the stove limit?
YES
Replace the stove
limit.
NO
(13)
Is there voltage across
the coil(s) of the heater
contactor(s)?
NO
Correct wiring
between heater
contactor and stove
limit.
NO
Correct wiring
between HC1 and
Line voltage.
NO
Correct wiring
between HC2 and
Line voltage.
NO
Check for
proper operation of
contactors, replace
them if necessary.
YES
(14)
Is there voltage to the
L1, L2 and L3
terminals of HC1?
YES
(15)
Is there voltage to the
L1, L2 and L3
terminals of HC2?
YES
(16)(17)(18)
Is there voltage across
T1 & T2, T2 & T3 and
T3 & T1?
Unit is operational
YES
Do all elements
produce heat?
NO
Check elements for
shorts or opens.
Check wires
between contactors
and elements.
YES
TMB1989S
TMB1989S
Please see following page for wiring diagram information.
54
70304901R6
16
L3
CONNECTION
L2
T2
HC1
L2
H4
H2
T3
T2
17
15
18
H5
2
SECONDARY
FUSE
MDL-3.5A
250V
HC1
H3
TB1-L3
L3
HC2
L2
HEATING ELEMENTS
H6
T1
T3
H1
HC2
L1
HC1
HC2
T1
L1
L3
TB1-L2
250V
2
1
3
3
4
1
N.O.
COM
6
4
RED/WHT
RED/BLU
N.O.
COM
LINT
DRAWER
SWITCH
SECONDARY
FUSE
1.25 T
250V
WHT
24V
1.5A
5
DOOR
SWITCH
24V
4.0A
2
SEE
TRANSFORMER
CONFIGURATION
JUMPER
1
AGC-2A
FUSES
PRIMARY
BLK/
WHT
BLK/
WHT
SERVICE
BLK
BLK
RED
RED
RED/WHT
RED
RED
TB1-L1
RED/BLK
RED/BLK
RED/BLK
FS-2
H2-1
H2-2
H2-5
3
2
1
5
H5
6 8
7
9
10 11 12
HEAT RELAY
MOTOR RELAY
COIN DROPS
4
RED
WHT/BLU
1
DOOR SENSING CIRCUIT ALLOWS
CONTROL TO TURN ON MOTOR
RELAY ONLY WHEN DOOR IS
CLOSED & SWITCH IS PRESSED
VOLTAGE CONFIGURATION INPUT
JUMPER H2-2 TO H2-5 AS FOLLOWS:
24Vac - WIRE JUMPER
120Vac - 6.8K ohm 5 watt
240Vac - 13.6K ohm 10 watt
MDC CONTROL
24Vac
H1-2
L1
24Vac Ret
1
2
24VAC
H6
3 4
5
6
H4
8
7
6
H3
5
4
7
6
WHT
5
4
3
2
3
2
2
100 OHM
1/4 watt
1
Door Sense Ret
TEMP. REGULATING
CIRCUIT CONTROLS
HEAT RELAY
10 9
START PULSE INPUT
H3-1 & H3-2
Iin= 3-30ma
TIME 20msec MIN.
AVAILABLE OUTPUT
H3-3 & H3-4
OPTO OFF WHEN
MACHINE RUNNING
Vmax=28Vdc
Imax=5ma
CONTROL
POWER
SUPPLY
H1-1
SEE VEND
APPLICATION DETAIL
H1-4
H1-3
24Vac Ret
14
4N25
TB3
FS-1
H2-4
H2-3
H2-6
1
H4
10 9
COM
8
N.O.
9
CABINET
LIMIT
THERMOSTAT
10
7
VLT
4
BRN
M
5
5
12
BRN/WHT
6
WHT
3
14
2
11
M
6
1
13
7
ORG/
WHT
WHT
WHT
BLK
WHT/
BRN
3
8
5
TMB1990S
HC2
HC1
13
FAN MOTOR
CENTRIFUGAL
SWITCH
THERMISTOR
WHT
VLT/WHT
STOVE
LIMIT
THERMOSTAT
WHT
N.C.
ORG
BRN/RED
4
AIR FLOW
SWITCH
ORG/BRN
3
WHT
CHASSIS GROUND
GRN/YEL
BLK
THERMISTOR
WHT
H11L1
70304901R6
WHT/VLT
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Micro Display Control (MDC) Troubleshooting
Unit Will Not Heat – Electric (T30 Models Only)
55
WHT
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Micro Display Control (MDC) Troubleshooting
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumbler before servicing.
• Close gas shut-off valve to gas tumbler before servicing.
• Close steam valve to steam tumbler before servicing.
• Never start the tumbler with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumbler is properly grounded.
W002
28. Error Codes
OP - Indicates physical “open” in the thermistor
circuit. Possible causes are: 1) thermistor, 2)
wiring between control and thermistor, 3) control.
SH - Indicates a “short” in the thermistor circuit.
Possible causes are: 1) shorted thermistor, 2) a
short in the wiring between control and
thermistor, 3) control.
Display
EC:19 - Indicates no card reader communication.
The control and the reader cannot communicate.
Check reader, control and harness.
NOTE: For all other card reader errors, consult
the card reader manual provided by the
manufacturer.
Definition
Corrective Action
OP
Indicates an open circuit in the thermistor. • Check thermistor. Replace if inoperative.
• Check wiring between control and
thermistor. Refer to wiring diagram for
proper wiring.
• Check control. Replace if inoperative.
SH
Indicates a short circuit in the thermistor.
• Check thermistor. Replace if inoperative.
• Check wiring between control and
thermistor. Refer to wiring diagram for
proper wiring.
• Check control. Replace if inoperative.
Indicates no communication between
control and card reader.
• Check card reader. Replace if inoperative.
• Check wire harness connecting card reader
and control. Replace if inoperative.
• Check control. Replace if inoperative.
EC:19
*Card Reader
models only
56
Card Reader Machines: (In addition to the
above errors)
70304901R6
Micro Display Control (MDC) Troubleshooting
TMB2010S
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Gas and Steam Models
Control Circuit Schematic
70304901R6
57
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TMB2011S
Micro Display Control (MDC) Troubleshooting
Gas and Steam Models
Control Circuit Connection Diagram
58
70304901R6
Micro Display Control (MDC) Troubleshooting
TMB2012S
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Gas and Steam Models
Control Box Schematic
70304901R6
59
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TMB2013S
Micro Display Control (MDC) Troubleshooting
Gas and Steam Models
Control Box Connection Diagram
60
70304901R6
Micro Display Control (MDC) Troubleshooting
TMB2014S
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Electric Models
Control Circuit Schematic
70304901R6
61
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TMB2015S
Micro Display Control (MDC) Troubleshooting
Electric Models
Control Circuit Connection Diagram
62
70304901R6
Micro Display Control (MDC) Troubleshooting
TMB2016S
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Electric Models
Contactor Box Schematic
70304901R6
63
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TMB2017S
Micro Display Control (MDC) Troubleshooting
Electric Models
Contactor Box Connection Diagram
64
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Section 6
NetMaster Troubleshooting
Models with NC, NJ, NR, NX, NY, ZC, ZR, ZX and ZY
Control Suffixes
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
29. No Infra-red (IR) Communication
Gas and electric heat.
Single and three phase
power supply.
Attempt to
communicate with
the electronic
control from
the handheld
communication
device
Check the following:
Is there a response of
any kind from the
electronic control?
NO
Aim handheld
communication
device closer and
try again.
YES
Does the control
respond?
YES
NO
- low battery in handheld
communication device.
- low battery in the Symbol SPT 1800
infra-red box.
- poor connection between IR cup and
Micro-Wand.
- poor connection between IR box and
Symbol SPT 1800.
- is the IR window covered or blurred
on the control.
NO
Does the electronic
control display E:OF
or -C-?
-C-
Communication
sequence checks
out.
Replace the
electronic control.
"E:OF"
Check the following:
- IR communication disabled by
manual programming.
- Is the IR window on the control
covered or blocked.
- if needed, change control
board.
TMB1991S
TMB1991S
70304901R6
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NetMaster Troubleshooting
30. Coins Ignored When Entered
Gas and electric heat.
Single and three phase
power supply.
Start coin drop
diagnostic tests.
Does the display on the
electronic control
increment properly?
YES
Exit diagnostic
testing and reset
control. (Prompting
for vend price)
NO
Reconnect and run
diagnostic test
again.
NO
Reconnect and run
diagnostic test
again.
NO
Is connector H5 on the
control firmly seated in
its receptacle?
YES
Is the 3 pin connector
between coin drop and
control connected
correctly?
YES
Are wires exiting coin
drop optical sensor
cracked or broken?
YES
Replace coin drop
or optic switch.
NO
Replace coin drop.
If problem still exists
then replace the
electronic control.
66
TMB1992S
TMB1992S
70304901R6
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NetMaster Troubleshooting
31. Control Has No Display
Gas, steam and electric heat.
Single and three phase
power supply.
(1)
Is there voltage across
H1-1 & H1-3 on
the control?
YES
Replace electronic
control.
NO
(6)
Is there voltage at
the input of the
secondary fuse?
NO
Correct wiring
between secondary
fuse and
transformer.
YES
(7)
Is there power supplied
to the unit?
NO
Plug unit in and run
it.
Is there voltage at
output side of
secondary fuse?
NO
Replace secondary
fuse.
YES
YES
(2)
Is there voltage at input
of primary fuses?
NO
Correct wiring
between primary
fuse and power
supply.
Correct wiring
between control and
secondary fuse.
YES
(3)
Is there voltage at
output side of the
primary fuses?
NO
Replace primary
fuse(s).
YES
(4)
Is there voltage across
terminals 1 & 2 of
transformer primary?
NO
Correct wiring
between primary
fuse and
transformer.
YES
(5)
Is there voltage across
terminals 1 &
4 of transformer
secondary?
NO
Replace
transformer.
YES
TMB1993S
TMB1993S
Please see following 2 pages for wiring diagram information.
70304901R6
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NetMaster Troubleshooting
Control Has No Display (Sheet 1 of 2)
2
3
5
1
4
6
7
68
70304901R6
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NetMaster Troubleshooting
Control Has No Display (Sheet 2 of 2)
TMB2236S
TMB2236S
70304901R6
69
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NetMaster Troubleshooting
32. Door Open Indicator
(1)
Gas, steam and electric heat.
Single and three phase
power supply.
Is there voltage at
H2-1 on the electronic
control?
Reference voltage
checks to transformer
neutral.
YES
Replace control.
NO
(6)
Is there voltage at
the input of the
secondary fuse?
NO
Correct wiring
between secondary
fuse and
transformer.
YES
(7)
Is there power supplied
to the unit?
NO
Plug unit in and run
it.
Is there voltage at
output side of
secondary fuse?
NO
Replace secondary
fuse.
YES
YES
(8)
(2)
Is there voltage at input
of primary fuses?
NO
Correct wiring
between primary
fuses and power
supply.
Is there voltage at
N.O. of door
switch?
NO
Correct wiring
between N.O. and
output of secondary
fuse.
NO
Check for proper
function of door
switch replace if
necessary.
NO
Correct wiring
between N.O. on lint
drawer and COM on
door switch.
NO
Check for proper
operation replace if
necessary.
YES
YES
(9)
(3)
Is there voltage at
output side of the
primary fuses?
NO
Replace primary
fuse(s).
With door closed is
there voltage to
COM of door
switch?
YES
YES
(10)
(4)
Is there voltage across
terminals 1 & 2 of
transformer primary?
NO
Correct wiring
between primary
fuses and
transformer.
Is there voltage at
N.O. of lint drawer
switch?
YES
(11)
YES
(5)
Is there voltage across
terminals 2 & 3 of
transformer
secondary?
NO
Replace
transformer.
Is there voltage at
COM of lint drawer
switch with lint
drawer closed?
YES
YES
Correct wiring
between H2-1 of
electronic control
and COM of lint
drawer switch.
TMB1995S
TMB1995S
Please see following 2 pages for wiring diagram information.
70
70304901R6
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NetMaster Troubleshooting
Door Open Indicator (Sheet 1 of 2)
2
3
4
1
5
6
7
8
70304901R6
9
10
11
71
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NetMaster Troubleshooting
Door Open Indicator (Sheet 2 of 2)
TMB2237S
TMB2237S
72
70304901R6
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NetMaster Troubleshooting
33. Motor Will Not Start/Run
Note: test conducted with vend
(1) price satisfied and start button
pressed.
Is there voltage across
H2-1 and H2-6 on
the electronic control ?
NO
Gas, electric and steam heat
Single and three phase
power supply.
Refer to Door
Open Indicator
flowchart.
(2)
NO
Replace
control.
Does the fan motor
run?
NO
Correct wiring to coil
of motor relay .
3 phase. Also
see note on
next page
NO
Replace fan motor.
Single phase
Three phase. Also
see note on next
page.
(12)
Is the unit equipped
with single phase or
three phase power?
Is there supply voltage
between L2 & L3 of
motor control relay?
Single phase
(4)
NO
Correct wiring
between terminal 5
and power supply.
NO
Replace motor
control relay.
NO
Correct wiring
between L2, L3 and
supply.
YES
(13)
Is there voltage across
terminals L2 & T2 and
L3 & T3?
YES
(5)
Is there voltage at
terminal 8 of motor
control relay?
Correct wiring
between fan motor
and motor control
relay.
YES
Is unit equipped with
single phase or three
phase power supply?
YES
Is there voltage at
terminal 5 of the
motor control relay?
NO
YES
YES
(3)
Is there voltage
across the coil of
the motor control
relay?
(6)
Is there voltage across
terminals 1 & 4 of
the fan motor?
YES
Is there voltage
across H2-4 and H2-6
on the electronic control?
Replace electronic
Control.
YES
Replace motor
control relay.
NO
(7)
YES
Is there voltage at
terminal 6 of motor
control relay?
(10)
Is there supply voltage
to L1 and L2 of the
motor control relay?
NO
Correct wiring
between L1, L2 and
power supply.
YES
(11)
Is there votlage across
L1 & T1 and L2 & T2?
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
YES
(8)
Is there voltage at
terminal 9 of motor
control relay?
YES
NO
NO
Replace motor
control relay.
YES
NO
Note: tests conducted with vend
price satisfied and start button
pressed.
70304901R6
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NetMaster Troubleshooting
33. Motor Will Not Start/Run (continued)
(9)
Is there voltage across
terminals 1 & 4 of
cylinder motor?
NO
Correct wiring
between cylinder
motor and motor
control relay.
YES
Does the cylinder
motor run?
NO
Replace cylinder
motor.
YES
Motors are
operational.
Note: For high voltage three phase supply (380 volts
or higher), the cylinder and fan motors are supplied
by L1, L2, L3 through the motor relay terminals T1,
T2, T3. Make the appropriate adjustments when
doing voltage checks.
TMB1997S
TMB1997S
Please see following 4 pages for wiring diagram information.
74
70304901R6
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NetMaster Troubleshooting
Motor Will Not Start/Run (Sheet 1 of 2)
1 Phase Models
4
5
1
2
3
70304901R6
75
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NetMaster Troubleshooting
Motor Will Not Start/Run (Sheet 2 of 2)
1 Phase Models
7
4
5
8
6
9
TMB2238S
TMB2238S
76
70304901R6
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NetMaster Troubleshooting
Motor Will Not Start (Sheet 1 of 2)
3 Phase Models
1
70304901R6
77
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NetMaster Troubleshooting
Motor Will Not Start (Sheet 2 of 2)
3 Phase Models
12
10
13
11
2
3
6
9
TMB2239S
TMB2239S
78
70304901R6
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NetMaster Troubleshooting
34. Unit Will Not Heat – Gas
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
Is there voltage at
FS-2 of the control?
(7)
NO
Correct wiring
between FS-2 and
COM of lint drawer.
YES
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
YES
Replace
control.
Replace
thermistor.
(2)
(8)
NO
Is there voltage
at FS-1 of
control?
Is there voltage across
terminals 3 & 5 of fan motor
centrifugal switch?
NO
Is the
thermistor
operational?
YES
NO
(9)
NO
Correct wiring
between COM of
airflow switch
and FS-1 of the
control.
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
(10)
(4)
YES
Check for proper
function of airflow
switch and replace if
necessary.
Is there voltage across
cabinet limit?
YES
Replace cabinet
limit.
NO
NO
(5)
Is there voltage at
terminal 7 of motor
control relay?
Is there voltage to the
input side of the
cabinet limit?
YES
YES
Is there voltage across
COM & N.O. terminal
of airflow switch?
Replace fan motor.
YES
(3)
Is there voltage at COM
of airflow switch?
YES
(11)
NO
Correct wiring
between terminal 7
on motor control
relay and N.O.
terminal on airflow
switch.
YES
Is there voltage to
the input side of
stove limit 1?
NO
Correct wiring
between stove limit 1
and cabinet limit.
YES
(6)
Is there voltage across
terminals 7 & 4 of
motor control relay?
YES
Replace motor
control relay.
NO
70304901R6
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NetMaster Troubleshooting
34. Unit Will Not Heat – Gas (continued)
(12)
Is there voltage across
stove limit 1?
YES
Replace
stove limit 1.
NO
Is there gas flow
through the gas valve?
NO
Replace gas valve
coils or complete
gas valve.
NO
Replace high
voltage ignition
cable or igniter.
YES
(13)
Is there voltage to the
input side of the
stove limit 2?
NO
Correct wiring to
input side of
stove limit 2 and
stove limit 1.
YES
Does the igniter spark?
YES
(14)
Is there
voltage across
stove limit 2?
NO
Replace
stove limit 2.
YES
YES
Is there a flame?
Unit operational.
NO
(15)
Is there voltage to
terminal 2 of
the Ignition Control
Module (ICM)?
NO
Correct wiring
between terminal 2
of ICM and stove
limit.
YES
Note: Make sure unit is
not in a lock out
condition.
(16)
Is there voltage at
terminal 1 of ICM
board?
NO
Replace ICM board.
YES
(17)
Is there voltage across
the coils of the gas
valve?
NO
Correct wiring
between gas valve
and ICM board.
YES
TMB2235S
TMB2235S
Please see following 2 pages for wiring diagram information.
80
70304901R6
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NetMaster Troubleshooting
Unit Will Not Heat – Gas (Sheet 1 of 2)
1
7
2
5
4
6
3
10
8
12
99
14
13
11
70304901R6
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NetMaster Troubleshooting
Unit Will Not Heat – Gas (Sheet 2 of 2)
7
15
16
99
17
TMB2240S
TMB2240S
82
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Section 7
Hybrid Timer Control Troubleshooting
Models with QT, SD and SX Control Suffixes
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
35. Coins Ignored When Entered
Gas and electric heat.
Single and three phase
power supply.
Start coin drop
diagnostic tests.
Does the light
on the control
increment properly?
YES
Exit diagnostic
testing and reset
control. (Prompting
for vend price)
NO
Reconnect and run
diagnostic test
again.
NO
Reconnect and run
diagnostic test
again.
NO
Is connector H2 on the
control firmly seated in
its receptacle?
YES
Is the 3 pin connector
between coin drop and
control connected
correctly?
YES
Are wires exiting coin
drop optical sensor
cracked or broken?
YES
Replace coin drop
or optic switch.
NO
Replace coin drop.
If problem still exists
then replace the
electronic control.
70304901R6
TMB2051S
TMB2051S
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Hybrid Timer Control Troubleshooting
36. Control Has No Display – OPL Models
Gas, steam and electric heat.
Single and three phase supply.
Is there voltage
supplied to the unit?
NO
Connect supply
voltage and run unit.
YES
(6)
Check H6-1 (+) and
H6-2 (-) for +5 VDC.
NO
Replace hybrid
control assembly.
YES
Note : Reference voltage to
supply neutral.
(1)
Is there voltage to the
input side of the
primary fuse(s)?
NO
Correct wiring
between primary
fuse and supply.
Replace display
assembly.
YES
(2)
Is there voltage to the
output side of the
primary fuse(s)?
NO
Replace primary
fuse.
YES
(3)
Is there voltage
across the primary side
of the transformer?
NO
Correct wiring
between transformer
and primary fuse.
YES
(4)
Is there voltage across
2 & 3 of transformer
secondary?
NO
Replace transformer
YES
(5)
Is there volt age across
terminals H1-3 &
H1-1 on hybrid timer?
NO
Correct wiring
between hybrid timer
and transformer
secondary.
YES
TMB2000S
TMB2000S
Please see following 2 pages for wiring diagram information.
84
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Hybrid Timer Control Troubleshooting
Control Has No Display – OPL Models (Sheet 1 of 2)
1
2
4
3
TMB2019S
TMB2019S
70304901R6
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Hybrid Timer Control Troubleshooting
5
6
TMB1970S
Control Has No Display – OPL Models (Sheet 2 of 2)
86
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Hybrid Timer Control Troubleshooting
37. Display Flashes “dr” With Door Closed – OPL Models
Gas, steam and electric heat.
Single and three phase power supply.
(1)
(6)
Is there voltage between
H4-7 & H1-3 on
the control?
YES
Replace hybrid
control.
NO
Is there voltage at
the input of the
secondary fuse?
NO
Correct wiring
between secondary
fuse and
transformer.
YES
(7)
Is there power supplied
to the unit?
NO
Plug unit in and run
it.
Is there voltage at
output side of
secondary fuse?
NO
Replace secondary
fuse.
YES
YES
(8)
(2)
Is there voltage at input
of primary fuses?
NO
Correct wiring
between primary
fuse and power
supply.
Is there voltage
at COM of
door switch?
NO
Connect wiring
between COM and
output of secondary
fuse.
YES
YES
(9)
(3)
Is there voltage at
output side of the
primary fuses?
NO
Replace primary
fuse(s).
With door closed,
is there voltage
to NO of door
switch?
NO
Replace
door switch.
YES
YES
(4)
Is there voltage across
terminals 1 & 2 of
transformer primary?
NO
Correct wiring
between primary
fuse and
transformer.
Is there voltage
at COM of the
lint drawer
switch?
NO
Connect wiring
between door switch
and COM of lint
drawer switch.
YES
YES
With lint drawer
closed, is there
power at NO
connection?
(5)
Is there voltage across
terminals 2 &
3 of transformer
secondary?
YES
NO
NO
Replace
lint drawer switch.
Replace
transformer.
YES
Correct wiring between
lint drawer switch
and hybrid control.
TMB2001S
TMB2001S
Please see following 2 pages for wiring diagram information.
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Hybrid Timer Control Troubleshooting
Display Flashes “dr” With Door Closed – OPL Models (Sheet 1 of 2)
2
4
3
5
TMB1971S
TMB1971S
88
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Hybrid Timer Control Troubleshooting
11
7
6
8
9
10
1
TMB1970S
TMB1970S
Display Flashes “dr” With Door Closed – OPL Models (Sheet 2 of 2)
70304901R6
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Hybrid Timer Control Troubleshooting
38. Vend Satisfied, No In Use LED – Coin Models
Vend Satisfied,
No In Use LED –
Coin Models
(5)
(1)
Is
there voltage
at the input
side of the
primary fuse?
No
Correct wiring
between the
primary fuse
and the
terminal block.
Is
there voltage
at the input
side of the
secondary
fuse?
No
Correct wiring
between the
transformer
and the
secondary
fuse.
Yes
(6)
Yes
(2)
Is
there voltage
at the output
side of the
primary fuse?
No
Replace the
primary fuse.
No
Replace
secondary
fuse.
Yes
(7)
Yes
(3)
Is
there voltage
at the input
side of the
transformer?
Is
there voltage
at the output
side of the
secondary
fuse?
No
Correct wiring
between the
primary fuse
and the
transformer.
Is there
power to the
conrol of H1-1
and H1-3?
No
Correct wiring
between
fuse and
control.
Yes
(8)
Yes
(4)
Is
there voltage
at the output
side of the
transformer?
No
Replace
transformer.
Is
there voltage
at COM of the
door switch?
No
Correct wiring
between the
secondary
fuse and COM
of the door
switch.
Yes
Yes
continued on
next page
TMB2022S-a
TMB2022S-A
90
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Hybrid Timer Control Troubleshooting
38. Vend Satisfied, No In Use LED – Coin Models (continued)
continued from
previous page
(13)
(9)
Is
there voltage
at NO of the
door switch?
No
Replace the
door switch.
Is
the H6
connection
plugged in
securely on the
control?
No
Re-seat the
H6 connection
to the control.
Yes
Yes
(10)
Is
there voltage
at COM of the
lint drawer
switch?
No
Correct wiring
between the
door switch
and lint drawer
switch.
Yes
(11)
Is
there voltage
at NO of the
lint drawer
switch?
No
No
Replace the
lint drawer
switch.
Replace the
opto-coupler on
the coin drop.
No
Replace the
control.
Yes
No
Correct wiring
between the
lint drawer
switch and H3
on the control.
Unit is
operational.
Yes
Please see following 2 pages for wiring diagram information.
70304901R6
Re-seat the
optic-coupler
harness to the
control.
Yes
Yes
(12)
Is
there power at
H3-1 and H3-3
on the control?
Is the
optic-coupler
harness
connected
securely into the
control
harness?
TMB2022S-B
TMB2022S-b
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Hybrid Timer Control Troubleshooting
Vend Satisfied, No In Use LED – Coin Models (Sheet 1 of 2)
3
2
1
4
TMB1971S
TMB1971S
92
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Hybrid Timer Control Troubleshooting
10
6
5
7
8
9
11
12
TMB1972S
TMB1972S
Vend Satisfied, No In Use LED – Coin Models (Sheet 2 of 2)
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Hybrid Timer Control Troubleshooting
39. In Use LED Lit, No Motor Run – Coin Models
In Use LED Lit,
No Motor Run –
Coin Models
(5)
(1)
Is
there continuity
through the
start switch
circuit?
No
Correct or
replace the
start switch or
start switch
wiring.
Is
there voltage
at the input
side of the
motor relay?
No
Correct wiring
between the
motor relay
and terminal
block.
Yes
(6)
Yes
(2)
Is
there voltage
at H3-6 on the
control?
No
Replace the
control.
Is
there voltage
at the output
side of the
motor relay?
No
Replace the
motor relay.
Yes
(7)
Yes
(3)
Is
there voltage
at A1 on the
motor relay?
No
Correct wiring
between the
control and
the motor
relay A1.
Is
there voltage
across the
lines of the
motor?
No
Correct wiring
between the
motor and
motor relay.
Yes
Yes
Replace the
motor.
(4)
Is
there voltage
across A1 and
A2 on the
motor relay?
No
Correct wiring
between the
control and
the motor
relay A2.
Yes
TMB2023S
TMB2023S
Please see following 2 pages for wiring diagram information.
94
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Hybrid Timer Control Troubleshooting
1
2
3
4
TMB1972S
TMB1972S
In Use LED Lit, No Motor Run – Coin Models (Sheet 1 of 2)
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Hybrid Timer Control Troubleshooting
In Use LED Lit, No Motor Run – Coin Models (Sheet 2 of 2)
5
6
7
TMB1971S
TMB1971S
96
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Hybrid Timer Control Troubleshooting
40. Motor Will Not Start/Run – Coin Models
Note: test conducted with vend
(1) price satisfied and start button
pressed.
Is there voltage across
H3-1 and H3-6 on
the electronic control ?
NO
Gas, electric and steam heat.
Single and three phase power supply.
Refer to Vend Satisfied,
No In Use LED - Coin Models
flowchart.
Is there voltage across
terminals 1 & 4 of
the fan motor?
YES
(2)
Is there voltage
across H3-4 and H3-6
on the electronic control?
NO
Replace
control.
Does the fan motor
run?
NO
Correct wiring to coil
of motor relay .
3 phase. Also
see Note on
next page
NO
Replace fan motor.
Single phase
Three phase. Also
see Note on next
page.
(12)
Is the unit equipped
with single phase or
three phase power?
Is there supply voltage
between 3 & 1 of
motor control relay?
Single phase
(4)
NO
Correct wiring
between terminal 5
and power supply.
NO
Replace motor
control relay.
NO
Correct wiring
between 3, 1 and
.
power supply.
YES
(13)
Is there voltage across
terminals 3 & 4 and
1 & 2?
YES
(5)
Is there voltage at
terminal 6 of motor
control relay?
Correct wiring
between fan motor
and motor control
relay.
YES
Is unit equipped with
single phase or three
phase power supply?
YES
Is there voltage at
terminal 5 of the
motor control relay?
NO
YES
YES
(3)
Is there voltage
across the coil of
the motor control
relay?
(6)
YES
Replace motor
control relay.
NO
(7)
YES
Is there voltage at
terminal 1 of motor
control relay?
(10)
Is there supply voltage
to terminal 5 and 3 of the
motor control relay?
NO
Correct wiring
between 5, 3 and
power supply.
YES
(11)
Is there votlage across
5 & 6 and 3 & 4?
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
YES
(8)
Is there voltage at
terminal 2 of motor
control relay?
YES
NO
NO
Replace motor
control relay.
YES
NO
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Hybrid Timer Control Troubleshooting
40. Motor Will Not Start/Run – Coin Models (continued)
(9)
Is there voltage across
terminals 1 & 4 of
cylinder motor?
NO
Correct wiring
between fan motor
and motor control
relay.
NO
Correct wiring
between cylinder
motor and motor
control relay.
YES
Does the cylinder
motor run?
NO
Replace cylinder
motor.
NO
Replace fan motor.
YES
Motors are
operational.
Single phase
Note: For high voltage three phase supply (380 volts
or higher), the cylinder and fan motors are supplied
by L1, L2, L3 through the motor relay terminals T1,
T2, T3. Make the appropriate adjustments when
doing voltage checks.
Also
next
NO
YES
NO
NO
Correct wiring
between 3, 1 and
.
power supply.
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
Replace motor
control relay.
TMB2004S
TMB2004S
Please see following 3 pages for wiring diagram information.
98
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Hybrid Timer Control Troubleshooting
1
2
3
TMB1972S
TMB1972S
Motor Will Not Start/Run – Coin Models (Sheet 1 of 3)
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Hybrid Timer Control Troubleshooting
Motor Will Not Start/Run – Coin Models (Sheet 2 of 3)
4
7
5
8
9
6
TMB1971S
TMB1971S
1 Phase
100
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Hybrid Timer Control Troubleshooting
Motor Will Not Start/Run – Coin Models (Sheet 3 of 3)
10
12
13
11
11
13
TMB1973S
TMB1973S
3 Phase
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Hybrid Timer Control Troubleshooting
41. Motor Will Not Start/Run – OPL Models
Note: test conducted with vend
(1) price satisfied and start button
pressed.
Is there voltage across
H4-7 and H4-4 on
the electronic control ?
NO
Gas, electric and steam heat.
Single and three phase power supply.
Refer to Control Has No
Display - OPL Models
flowchart.
Is there voltage across
terminals 1 & 4 of
the fan motor?
YES
(2)
Is there voltage
across H4-3 and H4-4
on the electronic control?
NO
Replace
control.
Does the fan motor
run?
NO
Correct wiring to coil
of motor relay .
3 phase. Also
see Note on
next page
NO
Replace fan motor.
Single phase
Three phase. Also
see Note on next
page.
(12)
Is the unit equipped
with single phase or
three phase power?
Is there supply voltage
between 3 & 1 of
motor control relay?
Single phase
(4)
NO
Correct wiring
between terminal 5
and power supply.
NO
Replace motor
control relay.
NO
Correct wiring
between 3, 1 and
.
power supply.
YES
(13)
Is there voltage across
terminals 3 & 4 and
1 & 2?
YES
(5)
Is there voltage at
terminal 6 of motor
control relay?
Correct wiring
between fan motor
and motor control
relay.
YES
Is unit equipped with
single phase or three
phase power supply?
YES
Is there voltage at
terminal 5 of the
motor control relay?
NO
YES
YES
(3)
Is there voltage
across the coil of
the motor control
relay?
(6)
YES
Replace motor
control relay.
NO
(7)
YES
Is there voltage at
terminal 1 of motor
control relay?
(10)
Is there supply voltage
to terminal 5 and 3 of the
motor control relay?
NO
Correct wiring
between 5, 3 and
power supply.
YES
(11)
Is there votlage across
5 & 6 and 3 & 4?
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
YES
(8)
Is there voltage at
terminal 2 of motor
control relay?
YES
NO
NO
Replace motor
control relay.
YES
NO
102
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Hybrid Timer Control Troubleshooting
41. Motor Will Not Start/Run – OPL Models (continued)
(9)
Is there voltage across
terminals 1 & 4 of
cylinder motor?
NO
Correct wiring
between fan motor
and motor control
relay.
NO
Correct wiring
between cylinder
motor and motor
control relay.
YES
Does the cylinder
motor run?
NO
Replace cylinder
motor.
NO
Replace fan motor.
YES
Motors are
operational.
Single phase
Note: For high voltage three phase supply (380 volts
or higher), the cylinder and fan motors are supplied
by L1, L2, L3 through the motor relay terminals T1,
T2, T3. Make the appropriate adjustments when
doing voltage checks.
Also
next
NO
YES
NO
NO
Correct wiring
between 3, 1 and
.
power supply.
Replace motor
control relay.
Correct wiring
between terminal 6
of motor control
relay and supply.
Replace motor
control relay.
TMB2020S
TMB2020S
Please see following 3 pages for wiring diagram information.
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Hybrid Timer Control Troubleshooting
1
2
3
TMB1970S
TMB1970S
Motor Will Not Start/Run – OPL Models (Sheet 1 of 3)
104
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Hybrid Timer Control Troubleshooting
Motor Will Not Start/Run – OPL Models (Sheet 2 of 3)
4
7
5
8
9
6
TMB1971S
TMB1971S
1 Phase
70304901R6
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Hybrid Timer Control Troubleshooting
Motor Will Not Start/Run – OPL Models (Sheet 3 of 3)
10
12
13
11
11
13
TMB1973S
TMB1973S
3 Phase
106
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Hybrid Timer Control Troubleshooting
42. Unit Will Not Heat – Gas – Coin Models
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
(7)
Is there voltage at
FS-2 of hybrid control?
NO
Correct wiring
between FS-2 and
NO of lint drawer.
YES
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
YES
Replace hybrid
control.
Replace
thermistor.
(8)
(2)
NO
NO
Is there voltage
at FS-1 of hybrid
control?
Is the
thermistor
operational?
YES
Is there voltage across
terminals 3 & 5 of fan motor
centrifugal switch?
NO
(9)
NO
Correct wiring
between COM of
airflow switch and
FS-1 of hybrid
control.
Is there voltage to the
input side of the
cabinet limit?
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
YES
YES
(10)
(4)
Is there voltage across
COM & NO terminal
of airflow switch?
Replace fan motor.
YES
(3)
Is there voltage at COM
of airflow switch?
YES
YES
Check for proper
function of airflow
switch and replace if
necessary.
YES
Is there voltage across
cabinet limit?
Replace cabinet
limit.
NO
NO
(5)
Is there voltage at
terminal 13 of motor
control relay?
(11)
NO
Correct wiring
between terminal 7
on motor control
relay and NO
terminal on airflow
switch.
Is there voltage to the
input side of the stove
limit 1?
NO
Correct wiring
between stove limit 1
and cabinet limit.
YES
YES
(6)
Is there voltage across
terminals 13 & 14 of
motor control relay?
YES
Replace motor
control relay.
NO
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Hybrid Timer Control Troubleshooting
42. Unit Will Not Heat – Gas – Coin Models (continued)
(12)
Is there voltage across
the stove limit 1?
YES
YES
Replace the stove
limit.
NO
Is there gas flow
through the gas valve?
NO
Replace gas valve
coils or complete
gas valve.
NO
Replace high
voltage ignition
cable or igniter.
YES
(13)
NO
Is there voltage to
input side of
stove limit 2?
Correct wiring
between stove limit 1
and stove limit 2.
YES
Does the igniter spark?
YES
(14)
Is there voltage
across stove limit 2?
YES
YES
Replace stove limit 2.
Is there a flame?
Unit operational.
NO
NO
(15)
Is there voltage to
terminal 2 of
the Ignition Control
Module (ICM)?
NO
Correct wiring
between terminal 2
of ICM and stove
limit 2.
YES
Note: Make sure unit is
not in a lock out
condition.
(16)
NO
Is there voltage at
terminal 1 of ICM
board?
Replace ICM board.
YES
(17)
Is there voltage across
the coils of the gas
valve?
NO
Correct wiring
between gas valve
and ICM board.
YES
TMB2005S
TMB2005S
Please see following page for wiring diagram information.
108
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Hybrid Timer Control Troubleshooting
13
11
9
1
10
2
12
3
4
14
5
8
6
7
15
16
17
TMB1972S
TMB1972S
Unit Will Not Heat – Gas – Coin Models
70304901R6
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Hybrid Timer Control Troubleshooting
43. Unit Will Not Heat – Gas – OPL Models
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(7)
(1)
Is there
voltage at H4-1
of hybrid control?
NO
Is the
thermistor
operational?
NO
Replace
thermistor
YES
Is there voltage across
cabinet limit?
Replace cabinet
limit.
YES
YES
NO
Replace hybrid
control.
(2)
Is there voltage at
terminal 13 of motor
control relay?
(8)
NO
Correct wiring
between terminal 13
on motor control
and H4-1 on
hybrid control.
YES
Is there voltage to the
input side of the stove
limit 1?
NO
Correct wiring
between stove limit 1
and cabinet limit.
YES
(3)
Is there voltage across
terminals 13 & 14 of
motor control relay?
(9)
YES
Replace motor
control relay.
NO
Is there voltage across
the stove limit 1?
YES
Replace the stove
limit.
NO
(10)
(4)
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
YES
NO
Correct wiring
between stove limit 1
and stove limit 2.
YES
(5)
Is there voltage across
terminals 3 & 5 of fan motor
centrifugal switch?
Is there voltage to
input side of
stove limit 2?
(11)
YES
Replace fan motor.
Is there voltage
across stove limit 2?
YES
Replace stove limit 2.
NO
NO
(6)
Is there voltage to the
input side of the
cabinet limit?
YES
110
(12)
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
Is there voltage to
terminal 2 of
the Ignition Control
Module (ICM)?
NO
Correct wiring
between terminal 2
of ICM and stove
limit 2.
YES
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Hybrid Timer Control Troubleshooting
43. Unit Will Not Heat – Gas – OPL Models (continued)
Note: Make sure unit is
not in a lock out
condition.
(13)
Is there voltage at
terminal 1 of ICM
board?
NO
Replace ICM board.
YES
(14)
Is there voltage across
the coils of the gas
valve?
NO
Correct wiring
between gas valve
and ICM board.
YES
(15)
Is the airflow switch
working properly?
NO
Replace airflow
switch
YES
Is there gas flow
through the gas valve?
NO
Replace gas valve
coils or complete
gas valve.
NO
Replace high
voltage ignition
cable or igniter.
YES
Does the igniter spark?
YES
YES
Is there a flame?
Unit operational.
NO
TMB2006S
TMB2006S
Please see following page for wiring diagram information.
70304901R6
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Hybrid Timer Control Troubleshooting
10
8
6
1
9
2
3
11
4
7
5
12
13
14
TMB1970S
TMB1970S
Unit Will Not Heat – Gas – OPL Models
112
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Hybrid Timer Control Troubleshooting
44. Unit Will Not Heat – Steam – OPL Models (T30 Models Only)
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(6)
(1)
Is there
voltage at H4-1
of hybrid control?
NO
Is the
thermistor
operational?
NO
YES
YES
Replace hybrid
control.
Replace
thermistor
Is there voltage to the
input side of the
cabinet limit?
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
YES
(7)
(2)
NO
Is there voltage on
terminal 13 of motor
control relay?
Correct wiring
between terminal 7
on motor control
relay and N.C.
terminal on airflow
switch.
Is there voltage across
cabinet limit?
YES
Replace cabinet
limit.
NO
YES
(8)
(3)
YES
Is there voltage across
terminals 13 & 14 of
motor control relay?
Is there voltage across
the coil of the steam valve?
NO
Replace motor
control relay.
Correct wiring
between steam
valve and cabinet
limit.
YES
NO
(4)
Is there voltage on
terminal 3 of fan
motor centrifugal switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 4 of
motor control relay.
Does the steam valve
open allowing steam to flow?
No
Replace or rebuild
steam valve.
YES
(5)
Unit operational.
Is there voltage across
terminals 3 & 5 of
fan motor centrifugal switch?
YES
Replace fan motor.
TMB2007S
TMB2007S
NO
Please see following page for wiring diagram information.
70304901R6
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Hybrid Timer Control Troubleshooting
1
2
3
4
7
5
6
8
TMB1970S
TMB1970S
Unit Will Not Heat – Steam – OPL Models (T30 Models Only)
114
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Hybrid Timer Control Troubleshooting
45. Unit Will Not Heat – Electric Coin (T30 Models Only)
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(1)
Is there voltage at
FS-2 of hybrid control?
(7)
NO
Correct wiring
between FS-2 and
lint drawer switch NO.
YES
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 14 of
motor control relay.
YES
Replace hybrid
control.
Replace
thermistor.
(2)
(8)
NO
Is there voltage
on FS-1 of
hybrid control?
Is the
thermistor
operational?
YES
Is there voltage across
terminals 3 & 5 of
fan motor centrifugal switch?
NO
NO
(9)
NO
Correct wiring
between COM of
airflow switch and
FS-1 of hybrid
control.
YES
Is there voltage to the
input side of the
cabinet limit?
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
YES
(10)
(4)
Is there voltage across
COM & NO terminal
of airflow switch?
Replace fan motor.
YES
(3)
Is there voltage at COM
of airflow switch?
YES
YES
Check for proper
function of airflow
switch and replace if
necessary.
NO
Is there voltage across
cabinet limit?
YES
Replace cabinet
limit.
NO
(5)
Is there voltage at
terminal 13 of motor
control relay?
(11)
NO
Correct wiring
between terminal 13
on motor control
relay and hybrid
control.
YES
Is there voltage to the
input side of the stove
limit?
NO
Correct wiring
between stove limit
and cabinet limit.
YES
(6)
Is there voltage across
terminals 13 & 14 of
motor control relay?
YES
Replace motor
control relay.
NO
TMB1989S
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Hybrid Timer Control Troubleshooting
45. Unit Will Not Heat – Electric Coin (T30 Models Only) (continued)
Note: Please make
the oppropriate
adjustments if your
unit is single phase.
(12)
Is there voltage across
the stove limit?
YES
Replace the stove
limit.
NO
(13)
Is there voltage across
the coil(s) of the heater
contactor(s)?
NO
Correct wiring
between heater
contactor and stove
limit.
NO
Correct wiring
between HC1 and
line voltage.
NO
Correct wiring
between HC2 and
line voltage.
NO
Check for
proper operation of
contactors, replace
them if necessary.
YES
(14)
Is there voltage to the
T1, T2 and T3
terminals of HC1?
YES
(15)
Is there voltage to the
T1, T2 and T3
terminals of HC2?
YES
(16)(17)(18)
Is there voltage across
L3 & L1, L1 & L2 and
L2 & L3?
Unit is operational
YES
Do all elements
produce heat?
NO
Check elements for
shorts or opens.
Check wires
between contactors
and elements.
YES
TMB2008S
TMB2008S
Please see following 2 pages for wiring diagram information.
116
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Hybrid Timer Control Troubleshooting
TMB1974S
TMB1974S
11
2
1
10
3
12
4
9
8
6
5
13
7
Unit Will Not Heat – Electric Coin (T30 Models Only) (Sheet 1 of 2)
70304901R6
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Hybrid Timer Control Troubleshooting
Unit Will Not Heat – Electric Coin (T30 Models Only) (Sheet 2 of 2)
14
15
16
17
18
TMB1975S
TMB1975S
118
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Hybrid Timer Control Troubleshooting
46. Unit Will Not Heat – Electric OPL (T30 Models Only)
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(6)
(1)
Is there
voltage at H4-1
of hybrid control?
NO
Is the
thermistor
operational?
NO
Replace
thermistor
Is there voltage to the
input side of the
cabinet limit?
NO
Correct wiring
between cabinet
limit and terminal 5
of fan motor
centrifugal switch.
YES
YES
YES
Replace hybrid
control.
(7)
(2)
Is there voltage at
terminal 13 of motor
control relay?
NO
Correct wiring
between terminal 13
on motor control
relay and hybrid
control.
Is there voltage across
cabinet limit?
YES
Replace cabinet
limit.
NO
YES
(8)
(3)
Is there voltage across
terminals 13 & 14 of
motor control relay?
YES
Replace motor
control relay.
Is there voltage to the
input side of the stove
limit?
NO
Correct wiring
between stove limit
and cabinet limit.
YES
NO
(9)
(4)
Is there voltage at
terminal 3 of fan
motor centrifugal
switch?
NO
Correct wiring
between terminal 3
of fan motor
centrifugal switch
and terminal 14 of
motor control relay.
Is there voltage across
the stove limit?
YES
Replace the stove
limit.
NO
YES
(10)
(5)
Is there voltage across
terminals 3 & 5 of
fan motor centrifugal switch?
Is there voltage across
the coil(s) of the heater
contactor(s)?
YES
Replace fan motor.
NO
Correct wiring
between heater
contactor and stove
limit.
YES
NO
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Hybrid Timer Control Troubleshooting
46. Unit Will Not Heat – Electric OPL (T30 Models Only) (continued)
Note: Please make
the oppropriate
adjustments if your
unit is single phase.
(11)
Is there voltage to the
T1, T2 and T3
terminals of HC1?
NO
Correct wiring
between HC1 and
line voltage.
NO
Correct wiring
between HC2 and
line voltage.
NO
Check for
proper operation of
contactors, replace
them if necessary.
YES
(12)
Is there voltage to the
T1, T2 and T3
terminals of HC2?
YES
(13)(14)(15)
Is there voltage across
L3 & L1, L1 & L2 and
L2 & L3?
Unit is operational
YES
Do all elements
produce heat?
NO
Check elements for
shorts or opens.
Check wires
between contactors
and elements.
YES
TMB2009S
TMB2009S
Please see following 2 pages for wiring diagram information.
120
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Hybrid Timer Control Troubleshooting
8
1
2
3
9
4
7
5
6
10
TMB1976S
TMB1976S
Unit Will Not Heat – Electric OPL (T30 Models Only) (Sheet 1 of 2)
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Hybrid Timer Control Troubleshooting
Unit Will Not Heat – Electric OPL (T30 Models Only) (Sheet 2 of 2)
12
11
13
14
15
TMB1975S
TMB1975S
122
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Hybrid Timer Control Troubleshooting
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumbler before servicing.
• Close gas shut-off valve to gas tumbler before servicing.
• Close steam valve to steam tumbler before servicing.
• Never start the tumbler with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumbler is properly grounded.
W002
47. Error Codes
Display
Definition
Corrective Action
OP
Open thermistor error.
•
•
SH
Shorted thermistor error.
•
•
Check thermistor. Replace if inoperative.
Check wiring between control and
thermistor. Refer to wiring diagram for
proper wiring.
• Check control. Replace if inoperative.
Check thermistor. Replace if inoperative.
Check wiring between control and
thermistor. Refer to wiring diagram for
proper wiring.
• Check control. Replace if inoperative.
AF-1
Airflow switch closed when cycle started. • Check airflow switch. Replace if
inoperative.
AF-2
Airflow switch failed to closed after cycle • Check airflow switch. Replace if
inoperative.
started.
AF (flashing)
70304901R6
Airflow stich opened/closed 5 or more
times in a running cycle.
•
Check airflow switch. Replace if
inoperative.
123
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Section 8
Electronic Control Troubleshooting
Models with KC, KX, KY, LC, LX, LY, WC, WX and WY
Control Suffixes
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
124
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Electronic Control Troubleshooting
48. No Infrared Communication
L and W Control Suffixes Only
Gas and electric heat.
Single and three phase
power supply.
Attempt to
communicate with
the electronic
control from the
PDA.
Check the following:
Is there a response of
any kind from the
electronic control?
No
Aim PDA
closer and try again.
No
Yes
Yes
Does the electronic
control display E:OF
or -C-?
Does the control
respond?
- ls the battery low on the
PDA?
- Is the IR window covered or
blocked on the control?
- If needed, replace the
electronic control.
-C-
Communication
sequence checks
out.
E:OF
Check the following:
- Is IR communication disabled
by manual programming?
- Is the IR window on the control
covered or blocked?
- If needed, change control
board.
TMB2269S
TMB2269S
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Electronic Control Troubleshooting
49. Coins Ignored When Entered
L and W Control Suffixes Only
Gas and electric heat.
Single and three phase
power voltage.
Start coin drop
diagnostic tests.
Does the display on the
electronic control
increment properly?
NOTE: Refer to Programming Manual
for test procedures.
Yes
Exit diagnostic
testing and reset
control. (Prompting
for vend price)
No
Reconnect and run
diagnostic test
again.
No
Reconnect and run
diagnostic test
again.
No
Is connector H5 on the
control firmly seated in
its receptacle?
Yes
Is the 3 pin connector
between coin drop and
control connected
correctly?
Yes
Are wires exiting coin
drop optical sensor
cracked or broken?
Yes
Replace coin drop.
No
Replace coin drop.
If problem still exists,
then replace the
electronic control.
TMB1794S
TMB1794S
126
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Electronic Control Troubleshooting
50. No Display
(1)
Is there 24 volts AC
across terminals H1-1
and H1-3 on control?
Yes
Replace the
electronic control.
No
(2)
Is the secondary fuse
good?
No
Replace the fuse.
Yes
(3)
Is there 24 volts AC
across the red/blue and wht/blue
wires on the secondary side of
the transformer?
Yes
Correct the wiring
between the
transformer
secondary and the
electronic control.
No
(4)
Is line voltage present
across the black and lt blue wires
on the primary side of
the transformer?
Yes
Replace the
transformer.
No
(5)
Is the primary fuse
good?
No
Replace the primary
fuse.
Yes
Correct wiring from
terminal block to
transformer. Verify
that the unit is
connected to power
and the power is on.
TMB2299S
TMB2299S
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
No Display
5
1
4
2
3
TMB2300S
TMB2300S
128
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Electronic Control Troubleshooting
51. “Door Open” Indicator
Note: All voltages
are to be measured
to transformer
common, unless
otherwise stated.
“Door Open”
Indicator
(1)
Is the
primary fuse
good?
No
Replace the
primary fuse.
(6)
Is
there 24 volts
to the common
terminal of the door
switch?
Check door switch
No for proper operation.
Replace if
necessary.
Yes
Yes
(2)
Is
line voltage
present across the
black and lt blue wires
on the primary side of
the transformer?
No
Correct wiring
between the
transformer and
the fuse.
(7)
Is
there 24 volts
at the normally open
terminal of the door
switch with the door
closed?
No
Correct the wiring
between the door
switch and the lint
panel switch.
Yes
Yes
(3)
Is there
24 volts across
terminals 2 and 3
of the transformer
secondary?
No
Replace
transformer.
(8)
Is
there 24 volts
to the common
terminal of the
lint panel
switch?
No
Yes
(9)
Yes
(4)
Is
there 24 volts
to the input side
of the secondary
fuse?
Replace the lint
panel switch.
No
Check fuse.
Replace if
necessary.
Is
there 24 volts
to the contact on
the lint panel
switch?
No
Correct the wiring
between the N.O.
terminal on the lint
panel switch to
terminal H2-1 on
the control.
Yes
(10)
Yes
(5)
Is
there 24 volts
to the output side of
the secondary
fuse?
Yes
No
Correct the wiring
between the fuse
and the common
terminal of the
door switch.
Is there
24 volts across
terminals H5-7 and
H5-4 on the
control?
Yes
No
Replace
control.
Correct wiring from terminal
block to transformer. Verify
that unit is connected to
power and the power is on.
TMB2401S
TMB2401S
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
“Door Open” Indicator
10
1
2
3
4
9
8
7
6
5
TMB2300S
TMB2300S
130
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Electronic Control Troubleshooting
52. No Start/Run
*Note: For steps 2 and 3. For 208/240 1 phase, both lines to the motor
are controlled by contacts. Please check second set of contacts.
For 3 phase units, the three legs supplied to the moter will be
controlled by N.O. contacts. Please check all three legs.
(1)
Yes
Is there line voltage
across terminals 1 and
4 of the motor?
Check motor for
proper operation.
Replace if
necessary.
No
(2)
(5)
Yes
Is there voltage on the
output of the motor
relay?*
Correct wiring
between the motor
relay and the motor.
No
Is there 24 volts at
terminal H5-3 on the
control? Measured to
transformer neutral.
Yes
Correct wiring
between control and
motor relay coil.
No
(3)
(6)
Is there voltage to the
input side of the motor
relay?*
No
Correct wiring
supplying voltage to
the contacts of the
motor relay.
Is there 24 volts to
terminal H5-7 on the
control?
Yes
Press the start
button. If machine
does not start,
replace control.
No
Yes
(4)
Is there 24 Volts across
the coil of the relay?
Yes
Check relay for
proper operation.
Replace if
necessary.
Correct wiring to the
control. Refer to
“ ‘Door Open’
Indicator.”
No
TMB2272S
TMB2272S
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
No Start/Run
1
3
2
6
5
4
TMB2300S
TMB2300S
132
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Electronic Control Troubleshooting
53. Unit Will Not Heat – Gas
Note: Tests are conducted with unit running
and calling for heat.
(6)
All voltage checks are referenced to
transformer neutral.
Is there voltage at
terminal 5 of the fan
motor relay?
(1)
Is there voltage at
H5-13 of control?
Correct wiring
between H5-13 and
N.O. of airflow
switch.
No
No
Check motor
or replace if
necessary.
No
Correct wiring
between cabinet
limit and terminal 5
of fan motor.
No
Check cabinet
limit for proper
operation. Replace
if necessary.
Yes
(7)
Yes
Replace
control.
Replace
thermistor.
(2)
No
Is there voltage
at H5-1 of
control?
No
Is the
thermistor
operational?
Yes
Yes
Yes
(8)
Is there voltage to the
output of the cabinet
limit?
(3)
Is there voltage at input
terminal of the motor
control relay?
Is there voltage to the
input of the cabinet
limit?
No
Correct wiring
between input
and H5-1.
Yes
(9)
Yes
Is there voltage to the
input of the stove limit?
(4)
Is there voltage at
the output terminal
of the fan motor
relay?
No
Correct wiring
between cabinet limit
and stove limit
thermostat.
No
Replace relay.
Yes
(10)
Yes
Is there voltage to the
output side of the stove
limit?
(5)
Is there voltage at
terminal 3 of the fan
motor?
Yes
No
Check wiring
between
motor terminal 3
and motor
relay.
No
Check operation of
stove limit. Replace
if necessary.
Yes
Continued on next
page
TMB2275S-A
TMB2275S-a
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Electronic Control Troubleshooting
53. Unit Will Not Heat – Gas (continued)
Yes
Is there a flame?
Continued from
previous page
Unit operational.
No
(11)
Is there voltage to
terminal 2 of the
Ignition Control Module
(ICM)?
No
Correct wiring
between terminal 2
of ICM and stove
limit.
Yes
Note: Make sure unit is
not in a lockout
condition.
(12)
Is there voltage at
terminal 1 of ICM
board?
No
Replace ICM board.
Yes
(13)
Is there voltage across
the coils of the gas
valve?
No
Correct wiring
between gas valve
and ICM board.
No
Replace gas valve
coils or complete
gas valve.
No
Replace high
voltage ignition
cable or igniter.
Yes
Is there gas flow
through the gas valve?
Yes
Does the igniter spark?
Yes
TMB2275S-B
TMB2275S-b
Please see following page for wiring diagram information.
134
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Electronic Control Troubleshooting
Unit Will Not Heat – Gas
1
2
3
4
5
6
8
10
7
9
TMB2300S
TMB2300S
11
12
70304901R6
13
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Electronic Control Troubleshooting
54. Unit Will Not Heat – Steam
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(6)
(1)
Correct wiring
between H5-13 and
N.O. of airflow
switch.
No
Is there voltage at
H5-13 of control?
No
Check motor
or replace if
necessary.
No
Correct wiring
between cabinet
limit and terminal 5
of fan motor.
No
Check cabinet
limit for proper
operation. Replace
if necessary.
No
Check steam
valve for proper
operation. Replace
if necessary.
Yes
Yes
Replace
control.
Replace
thermistor.
(2)
(7)
No
Is there voltage
at H5-1 of
control?
Is there voltage at
terminal 5 of fan motor
relay?
Is there voltage to the
input of the cabinet
limit?
No
Is the
thermistor
operational?
Yes
Yes
Yes
(8)
(3)
Is there voltage at input
terminal of the motor
control relay?
No
Correct wiring
between input
terminal and H5-1.
Is there voltage to the
output of the cabinet
limit?
Yes
Yes
(9)
(4)
Is there
voltage at the
output terminal of the fan
motor relay?
No
Replace relay.
Does the
steam valve
open?
Yes
Yes
(5)
Is there voltage at
terminal 3 of the fan
motor?
No
Check wiring
between motor
terminal 3 and
motor relay.
Verify that the correct
steam is supplied to the
unit. Verify that the steam
valve and other items were
installed according to the
Installation Manual.
Yes
TMB2276S
TMB2276S
Please see following page for wiring diagram information.
136
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Electronic Control Troubleshooting
Unit Will Not Heat – Steam
1
2
3
4
5
6
8
7
9
70304901R6
TMB2300S
TMB2300S
137
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Electronic Control Troubleshooting
55. Unit Will Not Heat – Electric
Note: Tests are conducted with unit running
and calling for heat.
All voltage checks are referenced to
transformer neutral.
(6)
(1)
Correct wiring
between H5-13 and
N.O. of airflow
switch.
No
Is there voltage at
H5-13 of control?
Check motor
or replace if
necessary.
No
Correct wiring
between cabinet
limit and terminal 5
of fan motor.
No
Check cabinet
limit for proper
operation. Replace
if necessary.
Replace
control.
Replace
thermistor.
(2)
(7)
No
Is there voltage to the
input of the cabinet
limit?
No
Is the
thermistor
operational?
Yes
Yes
Yes
(8)
(3)
Is there voltage at input
terminal of the motor
control relay?
No
Correct wiring
between input
terminal and H5-1.
(9)
(4)
Is there
voltage at the
output terminal of the fan
motor relay?
No
Replace relay.
Is there voltage to the
input of the stove limit?
No
Correct wiring
between stove limit
and normally open
terminal of the
airflow switch.
Yes
Yes
(10)
(5)
Is there voltage at
terminal 3 of the fan
motor?
Is there voltage to the
output of the cabinet
limit?
Yes
Yes
Yes
No
Yes
Yes
Is there voltage
at H5-1 of
control?
Is there voltage at
terminal 5 of fan motor
relay?
No
Check motor for
proper operation.
Replace if
necessary
Is there voltage to the
output side of the stove
limit?
No
Check operation of
stove limit. Replace
if necessary.
Yes
Continued on next
page
TMB2277S-A
TMB2277S-a
138
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Electronic Control Troubleshooting
55. Unit Will Not Heat – Electric (continued)
Continued from
previous page
(11)
Is there voltage across
the coil(s) of the heater
contactor(s)?
No
Correct wiring
between heater
contactor and
stove limit.
No
Correct wiring
between HC1, HC2
and line voltage.
No
Check for proper
operation of
contactors. Replace
if necessary.
Yes
(12)
Is there voltage to the
input terminals of HC1
and/or HC2?
Yes
(13)
Is there voltage to the
output side of
HC1/HC2 contacts?
Yes
Do all elements
produce heat (glow a
slight orange color)?
No
Check elements for
shorts or opens.
Check wires
between contactors
and elements.
Yes
Unit is operational.
TMB2277S-B
TMB2277S-b
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
Unit Will Not Heat – Electric
12
13
1
2
5
6
4
3
8
7
9
10
11
140
TMB2301S
TMB2301S
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Electronic Control Troubleshooting
56. CE Models No Display
(1)
(5)
Yes
Is there voltage across
H1-1 and H1-3 on the
control?
Replace the control.
Is there
line voltage on the
output side of the
primary fuse?
Yes
Correct wiring
between primary
fuse and
transformer.
No
No
(2)
(6)
Is there voltage coming
out of fuse F4?
Yes
Correct wiring
between fuse F4
and control.
Is there
line voltage on the
input side of primary
fuse?
Yes
Replace primary
fuse.
No
No
(2)
No
Is fuse F4 good?
Replace fuse.
Verify that unit is
plugged in. Correct
wiring between
supply terminals
and fuse F1.
Yes
(3)
Is there voltage across
terminals 1 and 4 of
the transformer?
Yes
Correct wiring
between
transformer
and fuse.
No
(4)
Is line voltage supplied
to the transformer
primary?
Yes
Check transformer
for operation.
Replace if
necessary.
No
TMB2288S
TMB2288S
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
CE Models No Display
6
5
4
3
2
1
TMB2302S
TMB2302S
142
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Electronic Control Troubleshooting
CE Models “Door Open” Indicator
Note: All voltage checks
are referenced to the
transformer common
unless otherwise
stated.
(6)
(1)
Is there voltage across
terminals H5-7 and
H5-3 on the control?
Yes
Replace control.
No
Is there
voltage on
output side
of F3?
Yes
Correct wiring
between F3 and DS.
No
(7)
(2)
Is there
voltage at
COM terminal of lint
door switch
(LDS)?
Yes
Correct wiring
between loading
door and control.
Is
there voltage to
input side
of F3?
Yes
Replace fuse.
No
No
(8)
(3)
Is there voltage at
N.C. terminal
of LDS?
Yes
Make sure lint
door is closed.
Check function
of LDS.
Replace if
necessary.
Is
there voltage on
the secondary side
of transformer?
Yes
Correct wiring
between fuse
and transformer.
Yes
Replace
transformer.
No
No
(9)
(4)
Is
there voltage
at COM terminal
of door switch
(DS)?
Yes
Correct wiring
between DS
and LDS.
Is there
voltage supplied to the
primary of the
transformer?
No
No
(5)
Is there
voltage at N.C. terminal
of DS?
(10)
Yes
Make sure door
is closed.
Check function
of DS. Replace if
necessary.
Verify primary fuses are good. Replace
if necessary. Check and correct wiring
between power terminal block and
transformer. Verify machine has
supply voltage.
No
TMB2289S
TMB2289S
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
CE Models “Door Open” Indicator
10
7
8
9
6
1
5
4
3
2
TMB2302S
TMB2302S
144
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Electronic Control Troubleshooting
57. CE Models No Start/Run
Note: Common can be
neutral or live wire
depending on voltage
and phase.
Note: Voltage checks
referenced to
transformer
neutral unless
otherwise stated.
(4)
(1)
Is
there line voltage
supplied to the
motor?
Yes
Check operation of
motor. Replace if
necessary.
No
Is
there voltage across
the coil of the motor
relay?
Check for proper
operation of relay.
Replace if
necessary.
Yes
Correct wiring
between control and
motor relay.
Yes
Press start button.
If machine doesn’t
start, replace
control.
No
(5)
(2)
Is
there voltage on the
output side of the
motor relay terminals?
Check to common
line.
Yes
Correct wiring
between motor relay
and motor.
No
Is
there voltage across
H5-3 and H5-4 of the
control?
No
(6)
(3)
Is
there voltage on the
input side of the motor
relay terminals?
Check to common
line.
Yes
Yes
No
Correct wiring from
line supply voltage
to motor relay.
Is
there voltage to
H5-7 on the
control?
No
Correct wiring to
control. Refer to
“CE Models Door
Open Indicator.”
TMB2291S
TMB2291S
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
CE Models No Start/Run
2
3
3
1
2
6
5
4
TMB2302S
TMB2302S
146
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Electronic Control Troubleshooting
CE Models Will Not Heat – Gas/Steam
Note: Test conducted
with unit running and
calling for heat.
Note: Voltage checks
referenced to neutral
unless otherwise
stated.
(7)
(1)
Is there voltage on
H5-13 on the control?
No
Check airflow
switch (AFS) for
proper operation.
If needed correct
wiring between
AFS and H5-13.
Is there voltage to input
side of the cabinet limit
(CT)?
No
Correct wiring
between stove limit
and MCS.
No
Check CT for
proper operation.
Replace if
necessary.
Yes
Yes
(8)
(2)
Is there voltage at H5-1
of the control?
No
Check thermistor for
proper operation.
Replace if
necessary. Replace
control if thermistor
is good.
Is there voltage to the
output side of the CT?
Yes
Yes
Steam
See next
page
Gas
(9)
(3)
Is there voltage at
terminal 14 of the
K2 relay?
No
Correct wiring
between H5-1 on
the control and
terminal 14 of
K2.
Correct wiring
between ST-1
and CT.
No
Check function
of ST-1.
Replace if
necessary.
(10)
(4)
Is there voltage at
N.O. terminal of the
K2 relay?
No
Check for proper
operation of the
K2 relay.
Replace if
necessary.
Is there voltage on
output side of ST-1?
Yes
Yes
(11)
(5)
Is
there voltage to
the COM terminal of
motor centrifical switch
(MCS)?
No
Correct wiring
between K2 relay
and MCS.
Is there voltage on
terminal 4 of ignition
control module?
No
Correct wiring
between
terminal 4
and ST-1.
Yes
Yes
(12)
(6)
Is there voltage to the
output side of the MCS?
No
Check MCS
for proper operation.
Replace motor if
necessary.
Is there voltage on
terminal 2 of ignition
module?
No
Correct wiring
between terminal
2 and fuse F3.
Yes
Continued on next
page
70304901R6
No
Yes
Yes
Yes
Is there voltage to
input of ST-1?
TMB2292S-A
TMB2292S-a
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Electronic Control Troubleshooting
57. CE Models Will Not Heat – Gas/Steam (continued)
Continued from
previous page
(GAS)
(13)
Is there voltage
supplied to gas valve?
Yes
Check valve for proper operation.
Replace if necessary. Verify correct
pressure and gas supplied to machine.
Yes
Check SV for proper operation.
Replace if necessary. Verify steam is
properly supplied to machine.
No
Verify control is
NOT going into lock-out.
Correct wiring between
valve and ICM. Replace
ICM if necessary.
Continued from
previous page
(Steam)
(14)
Is there voltage
across steam valve (SV)?
No
Correct wiring between
SV and CT.
TMB2292S-B
TMB2292S-b
Please see following page for wiring diagram information.
148
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Electronic Control Troubleshooting
CE Models Will Not Heat – Gas/Steam
1
2
4
5
3
6
7
12
8
11
13
9
10
14
TMB2302S
TMB2302S
70304901R6
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Electronic Control Troubleshooting
58. CE Models Will Not Heat – Electric
Note: Test conducted
with unit running and
calling for heat.
Note: Voltage checks
referenced to neutral
unless otherwise
stated.
(7)
(1)
Is there voltage on
H5-13 on the control?
No
Check airflow
switch (AFS) for
proper operation.
If needed correct
wiring between
AFS and H5-13.
Is there voltage to input
side of the cabinet limit
(CT)?
No
Correct wiring
between stove limit
and MCS.
No
Check CT for
proper operation.
Replace if
necessary.
No
Correct wiring
between ST and
CT.
No
Check function
of ST. Replace
if necessary.
Yes
Yes
(8)
(2)
Is there voltage at H5-1
of the control?
No
Check thermistor for
proper operation.
Replace if
necessary. Replace
control if thermistor
is good.
Is there voltage to the
output side of the
CT?
Yes
Yes
(9)
(3)
Is there voltage at
terminal 14 of the
K2 relay?
No
Correct wiring
between H5-1 on
the control and
terminal 14 of K2.
Is
there voltage to
input of ST?
Yes
Yes
(10)
(4)
Is there voltage at
N.O. terminal of the
K2 relay?
No
Check for proper
operation of the
K2 relay.
Replace if
necessary.
Is
there voltage on
output side
of ST?
Yes
Yes
(5)
Is there voltage to the
COM terminal of
motor centrifical
switch (MCS)?
No
Correct wiring
between K2
relay and
MCS.
No
Check MCS
for proper operation.
Replace motor
if necessary.
Continued on next
page
Yes
(6)
Is there voltage to the
output side of the
MCS?
Yes
TMB2294S-A
TMB2294S-a
150
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Electronic Control Troubleshooting
58. CE Models Will Not Heat – Electric (continued)
Continued from
previous page
(11)
Is there line voltage
across element contactor
coils?
No
Correct wiring to
contact coils.
No
Replace
contactors.
Yes
Do the
contactors
pull in?
Yes
Is there voltage
on the output side
of the contactor?
No
Check for voltage to input side.
Correct wiring if necessary. Replace
contactor if voltage supplied to
input side.
Yes
Is there voltage
supplied to
elements?
No
Correct wiring between
elements and contactors.
Yes
No
Is heat produced?
Check element for open CK1.
Replace if necessary.
Yes
Unit operational.
TMB2294S-b
TMB2294S-B
Please see following page for wiring diagram information.
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Electronic Control Troubleshooting
CE Models Will Not Heat – Electric
2
1
4
5
3
6
7
9
11
TMB2303S
TMB2303S
8
10
152
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Section 9
LED OPL Control Troubleshooting
Models with EO Control Suffix
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
The control contains a comprehensive test cycle that can be used to verify machine configuration and
functionality.
Diagnostic LEDs
Before troubleshooting the following errors, verify that the front-end control is trying to turn the output on by
checking for the corresponding red diagnostic LED on the Input/Output (I/O) Board. Diagnostic LEDs can be
found for the following outputs:
• Forward Motor
• Reverse Motor
• Fan Motor
• Damper Motor
• External Alarm
• Heater
In addition, the I/O Board has a LED labeled “+5VDC” that indicates whether the I/O Board is powered.
When lit, the I/O Board and front-end control should both be powered. If the LED does not light and both
are powered, verify that the loading door and lint door are closed, and, if checking heater-related errors,
that the heat interlock chain is closed (AirFlow Switch, Fan Contactor, Fan Centrifugal Switch, Cabinet
Limit and Stove Limit). If the LED still does not light, check the connection between the front-end
control and the I/O Board. If they are connected properly and voltage is present at the pin corresponding
to the error with the ground pin on the same connector, the I/O Board must be replaced. If voltage is not
present, the front-end control must be replaced.
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LED OPL Control Troubleshooting
59. No Fan and/or Drive Motor Rotation
NOTE: All mechanical checks should be performed prior to starting the electrical checks. Ensure the belt(s), basket, idler
and pulleys are rotating freely.
(1)
No
Is there 24 volts AC at
H6-1 to H6-9?
Check Transformer
and Fuse F3.
NOTE: The following checks are DC voltage checks.
CAUTION: Always power down the machine PRIOR to
disconnecting or connecting the H3 harness. Once
harness is disconnected, you can power up the machine
for troubleshooting. Failure to do so may damage
the front-end control.
NOTE: If the voltage is present but
lower than 24volts AC, ensure the
correct transformer configuration
jumper is installed.
Yes
(3)
(2)
Is there 5 volts
DC at H3-1 to H3-11 with
contactor commanded to close
and 0 volts DC with
contactor not
commanded?
No
Is there 24 volts AC st
H6-5 to H6-11?
Yes
No
Check control harness
H3 and front-end control (AP2.)
Replace as required.
NOTE: The H3 harness will need to remain
connected during this test.
Yes
Check control harness
H3 and I/O board (API).
Replace or repair
as required.
(4)
Is there 24 volts AC at
contactor A1 to A2
(or Brown/Red to White)?
No
Replace or
repair harness.
(6)
Is there line voltage
on the motor side
of the contactor?
No
Replace contactor.
Yes
Yes
(7)
No
Is contactor
energizing?
Replace contactor.
Is
there line voltage
at the fan (F) and/or
drive (D) motor(s)?
No
Repair or replace
wiring harness.
Yes
Yes
(5)
Is there line voltage
on the line side of the
contactor?
Yes
No
Check incoming
power and wiring.
Replace or repair
as required.
Replace motor.
NOTE: The following checks are AC voltage
checks and should be equal to the line voltage
of the machine. Refer to the serial plate of the
machine for correct line voltage. The machine’s
motor(s) may be single or three phase.
TMB2405S
TMB2405S
Please see following 2 pages for wiring diagram information.
154
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LED OPL Control Troubleshooting
No Fan and/or Drive Motor Rotation (Drawing 1 of 2)
NOTE: The door and lint door must be closed for voltage to be present at the fan.
1
3
2
4
TMB2403S
TMB2403S
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LED OPL Control Troubleshooting
No Fan and/or Drive Motor Rotation (Drawing 2 of 2)
NOTE: The door and lint door must be closed for voltage to be present at the fan.
5C
6B
7C(F)
7A(F)
6A
5B
7B(F)
5A
7C(D)
7A(D)
6C
7B(D)
TMB2404S
TMB2404S
156
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LED OPL Control Troubleshooting
60. Stove and Cabinet Limit Errors
Error Display: E Cab
E SL
E SL2
NOTE: The machine must currently be trying to heat with airflow switch closed, fan motor contactor
engaged and fan motor centrifugal switch closed before checking the status of the cabinet, stove and stove 2
limits.
NOTE: The machine must currently be trying to heat with airflow switch closed, fan motor contactor engaged
and fan motor centrifigal switch closed before checking the status of the cabinet, cabinet store and store 2 limits.
NOTE: Not all machines have the stove limit or the secondary stove limit switch. Please refer to your machine’s
wiring diagram. Also, some machines have manual reset thermostats; these must be reset prior to attempting the
troubleshooting procedures.
(1)
(6)
No
Is there 24 volts AC at
H6-1 to H6-9?
Check Transformer
and Fuse F3.
NOTE: If the voltage is present but
lower than 24 volts AC, ensure the
correct transformer configuration
jumper is installed.
Yes
Is there 24 volts AC at
H2-7 to H6-9?
Replace
I/O Board (AP1).
Yes
Is there 24 volts AC at
H2-11 to H6-9?
Yes
Check harness and
secondary stove
limit switch. Repair
or replace as required.
NOTE: The following checks are DC
Voltage checks.
(3)
(8)
No
Check harness and
cabinet limit switch.
Repair or replace
as required.
Yes
Is there 5 volts DC at
H3-9 to H3-11 with cabinet
limit circuit open and 0 volts
DC with switch closed?
Yes
(4)
No
Is there 24 volts AC at
H2-8 to H6-9?
No
(7)
No
Is there 24 volts AC at
H2-2 to H6-9?
Replace
I/O Board (AP1).
Yes
(2)
Is there 24 volts AC st
H2-9 to H6-9?
No
Replace
I/O Board (AP1).
No
Check control harness
H3. Replace harness
or I/O Board (AP1)
as required.
NOTE: You will need to manually open
the circuit.
CAUTION: Always power down the machine
PRIOR to disconnecting or connecting the
H3 harness. Once disconnected, you can
power up the machine for troubleshooting.
Failure to do so may damage the front-end
control.
(9)
Is there 5 volts DC
at H3-20 to H3-11 with stove
limit circuit open and 0 volts
DC with switch closed?
Yes
(5)
Is there 24 volts AC at
H2-1 to H6-9?
Yes
No
Check harness and
stove limit switch.
Repair or replace
as required.
NOTE: Steam model machines will
utilize a jumper from pins H2-8 to H2-1.
Yes
No
Check control harness
H3. Replace harness
or I/O Board (AP1)
as required.
NOTE: You will need to manually open
the circuit.
(10)
Is there 5 volts DC at
H3-10 to H3-11 with
secondary stove limit circuit
open and 0 volts DC with
switch closed?
No
Check control harness
H3. Replace harness
or I/O Board (AP1)
as required.
Yes
Replace front-end
control (AP2).
TMB2376S
TMB2376S
Please see following page for wiring diagram information.
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LED OPL Control Troubleshooting
Stove Cabinet Limit Errors
1
8
9
10
2
3
4
5
6
H6-9
7
TMB2403S
TMB2403S
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LED OPL Control Troubleshooting
61. No Display
NOTE: On the UniLinc LCD-equipped machines, verify the contrast is set correctly prior to troubleshooting.
(1)
No
Is there 24 volts AC
at H1-1 to H1-3
Check Transformer
and Fuse F4.
NOTE: If the voltage is present but
lower than 24 volts AC, ensure the
correct transformer configuration
jumper is installed.
Yes
(2)
No
Is there 24 volts AC
at H1-2 to H1-4?
Replace
I/O Board (AP1).
NOTE: The pins H1-2 and H1-4 on I/O Board that connect
to pins H8-1 and H8-3 on the front-end control only provide
24 volts AC to the front-end control's network circuitry.
Yes
(3)
No
Is there 24 volts AC at
H8-1 to H8-3?
Replace or
repair harness.
NOTE: The following checks are DC
voltage checks.
Yes
(4a)
Is there 24 volts DC
at H3-13 to H3-11, closest
to the front-end control
(AP2?)
Yes
Verify correct transformer
configuration jumper is
installed. Check harness
and I/O Board (AP1).
Replace as necessary.
No
CAUTION: Always power down the machine
PRIOR to disconnecting or connecting the
H3 harness. Once disconnected, you can
power up the machine for troubleshooting.
Failure to do so may damage the front-end control.
(4b)
No
Is there 29 - 33 volts DC
at H3-14 to H3-11?
(4c)
Yes
Is there 5 volts DC at
H3-12 to H3-11?
Yes
No
Replace
front-end control (AP2.)
TMB2377S
Please see following page for wiring diagram information.
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No Display
1
3
2
4c
4b
4a
TMB2403S
TMB2403S
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62. Airflow Errors
Error Display: E AF1
E AF2
E AF
NOTE: Check airflow switch for proper mechanical operation; ensure there is no lint or other items interfering
with the proper operation.
NOTE: The airflow switch is required to be open prior to the beginning of the cycle. The switch is also required
to close within the cycle.
(1)
No
Is there 24 volts AC
at H6-1 to H6-9?
Check Transformer
and Fuse F3.
NOTE: If the voltage is present but
lower than 24 volts AC, ensure the
correct transformer configuration
jumper is installed.
Yes
(2)
No
Is there 24 volts AC
at H2-12 to H6-9?
Replace
I/O Board (AP1).
Yes
(3)
Is there 24 volts AC at
H2-5 to H6-9 with airflow
switch closed?
No
Check harness and
airflow switch.
Repair or replace
as required.
NOTE: The following checks are DC
voltage checks.
Yes
(4)
Is there 5 volts DC at H3-7
to H3-11 with switch open
and 0 volts DC with
switch closed?
Yes
No
Check control harness
H3 and I/O Board (AP1).
Replace as required.
CAUTION: Always power down the machine
PRIOR to disconnecting or connecting the
H3 harness. Once disconnected, you can
power up the machine for troubleshooting.
Failure to do so may damage the front-end control.
Replace front-end
control (AP2).
TMB2378S
Please see following page for wiring diagram information.
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Airflow Errors
1
4
2
3
TMB2403S
TMB2403S
162
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63. Fan Motor Centrifugal Switch Error
Error Display: E FnCs
NOTE: Before performing these checks, the airflow switch must be pulled in, the fan motor contactor
must be closed, and the motor must be running.
(1)
No
Is there 24 volts AC
at H6-1 to H6-9?
Check Transformer
and Fuse F3.
Yes
(2)
No
Is there 24 volts AC
at H2-10 to H6-9?
Replace
I/O Board (AP1).
Yes
(3)
No
Is there 24 volts AC at
H2-3 to H6-9 with fan
motor running?
Yes
Check harness and
wire connections at
the motor. Repair or
replace as necessary.
NOTE: The following checks are DC
voltage checks.
(4)
No
Yes
Check control harness
H3 and I/O Board (AP1).
Replace as required.
CAUTION: Always power down the machine
PRIOR to disconnecting or connecting the
H3 harness. Once disconnected, you can
power up the machine for troubleshooting.
Failure to do so may damage the front-end control.
Replace front-end
control (AP2.)
TMB2379S
Please see following page for wiring diagram information.
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Fan Motor Centrifugal Switch Error
1
4
2
3
TMB2403S
TMB2403S
164
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LED OPL Control Troubleshooting
64. Close Door Indication
NOTE: Before proceeding, check the lint door, loading doors and switches for proper mechanical operation.
(1)
No
Is there 24 volts AC at
H6-1 to H6-9?
Check Transformer
and Fuse F3.
NOTE: If the voltage is present but
lower than 24 volts AC, ensure the
correct transformer configuration
jumper is installed.
Yes
(2)
No
Is there 24 volts AC at
H6-8 to H6-9?
Replace
I/O Board (AP1).
NOTE: The following checks are DC
Voltage checks.
(6)
Is there 5 volts DC at
H3-6 to H3-11 closest to the
front-end control with loading
door open and 0 volts DC
with loading door
closed?
Yes
Yes
(3)
No
Check harness.
Replace harness
or I/O Board (AP1).
as required.
CAUTION: Always power down the machine
PRIOR to disconnecting or connecting the
H3 harness. Once disconnected, you can
power up the machine for troubleshooting.
Failure to do so may damage the front-end control.
(7)
No
Is there 24 volts AC at
H6-2 to H6-9?
Check harness and
loading door switch.
Repair or replace
as required.
Yes
Is there 5 volts DC
at H3-18 to H3-11 with either
loading or lint door open and
0 volts DC with both
doors closed?
No
Check harness and
I/O Board (AP1).
Repair or replace
as required.
Yes
(4)
No
Is there 24 volts AC at
H6-3 to H6-9 with loading
door and lint doors
closed?
Replace
I/O Board (AP1).
Replace front-end
control (AP2).
Yes
(5)
Is there 24 volts AC at
H6-4 to H6-9 with both
doors closed?
No
Check harness and
lint door switch.
Repair or replace
as required.
Yes
TMB2380S
Please see following page for wiring diagram information.
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Close Door Indication
1
2
3
4
5
6
7
TMB2403S
TMB2403S
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LED OPL Control Troubleshooting
65. Moisture Sensor Error
Error Display: EnoiST
NOTE: Before troubleshooting the Moisture Sensor Error, run the Moisture Sensor Tests found in Table 5.
NOTE: Before troubleshooting the Moisture Sensor Error. run the Moisture Sensor Tests found in Table 5.
NOTE: All testing must be done with an empty basket. Use the orange test jumper from Part No. 70468901 to
assist in troubleshooting.
NOTE: Test procedures should be verified on each insulated baffle independently.
NOTE: Loose or cut wires can cause intermittent shorts or opens. If this condition is suspected, a close
inspection of the wiring harnesses is required. Remove the basket for a proper wire harness inspection.
(2)
(1)
After disconnecting the
H5 connector, is there
any resistance into
the wire harness?
Yes
(3)
After disconnecting
2-wire slip ring harness
located at rear of trunnion shaft,
is there any resistance
into slip ring
harness?
No
After removing
3 screws from slip ring
assembly, is there any resistance
at bullet connector to
trunnion shaft?
Yes
No
Yes
Remove basket and
look for short
between basket and
each insulated baffle.
Repair or replace
wiring harness
as necessary.
No
Verify connections on
both ends of slip
ring assembly.
Replace as required.
Repair or replace
wiring harness
between control and
slip rings.
(4)
After creating a
direct short with orange
test jumper between basket
and insulated baffle,
is there any
ressistance?
Yes
If less than 2 ohms,
verify correct dipswitch
settings and perform
diagnostic test cycle.
No
(5)
After disconnecting the
2-wire slip ring harness located
at rear of trunnion shaft, is
there resistance into the
slip ring harness?
Yes
Repair or replace
wiring harness
between control
and slip rings.
(6)
No
After removing
3 screws from slip ring
assembly, is there any resistance
at bullet connector to
trunnion shaft?
Yes
Verify connections on
both ends of slip
ring assembly.
Replace as required.
No
Remove basket
and repair or
replace wiring harness.
TMB2381S
Please see following page for wiring diagram information.
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Moisture Sensor Error
1
3
4
6
5
2
TMB2403S
TMB2403S
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LED OPL Control Troubleshooting
Troubleshooting the Moisture Sensor Circuit
WARNING
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumble dryer before servicing.
• Close gas shut-off valve to gas tumble dryer before servicing.
• Close steam valve to steam tumble dryer before servicing.
• Never start the tumble dryer with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumble dryer is properly grounded.
W002R1
NOTE: Troubleshooting must be done with the machine basket empty.
66. Troubleshooting at the Control
1. On the control board, unplug the harness from header H5 (Refer to Figure 18).
1
2
TMB2396S
1
2
H5
Harness
Figure 18
2. Insert ohm meter probes into pins 1 and 2 of the harness. If the metered value is infinite resistance, open load
(OL), proceed to step 3. If not, proceed to Paragraph 67.
3. Create a direct short between machine basket and moisture sensing baffle/ground using test jumper (Refer to
Figure 19). If metered value is less than 1 ohm, circuit is functioning properly; double-check machine
configuration and cycle programming. If 1 ohm or greater, proceed to Paragraph 67.
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1
2
3
TMB2397S
1
2
3
Basket
Test Jumber
Moisture Sensing Baffle
Figure 19
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LED OPL Control Troubleshooting
67. Troubleshooting From Control to Slip Ring Assembly
1. At the control, unplug harness at header H5 (Refer to Figure 18).
2. At the slip ring assembly, unplug the moisture sensing harness on the control side of the slip ring assembly
(Refer to Figure 20).
3
1
4
2
5
6
7
TMB2398S
1
2
3
4
5
6
7
Connector
Black Wire
Moisture Sensing Harness
Slip Ring Assembly Harness
Set-Screw
White Wire
Screws
Figure 20
3. The harness from the control leads into a junction panel before reaching the slip ring assembly. Inspect
junction panel for intermittent connections or unplugged harnesses (Refer to Figure 21).
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TMB2399S
TMB2399S
Figure 21
4. An additional harness connection exists between the junction panel and the slip ring assembly. Inspect
connection for intermittent connections or unplugged harness.
5. Insert ohm meter probes into pins 1 and 2 of the harness unplugged from H5. If the metered value is infinite
resistance, open load (OL), proceed to Step 6. If not, replace harness and return to Paragraph 65.
6. Create a direct short between pin 1 and 2 of the moisture sensing harness on the control side of the slip ring
assembly (Refer to Figure 20). If the metered value is less than 1 ohm, proceed to Paragraph 67. If 1 ohm or
greater, replace harness and return to Paragraph 65.
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68. Troubleshooting At Slip Ring Assembly
1. At the slip ring assembly, unplug the slip ring assembly harness on the control side of the slip ring assembly
(Refer to Figure 20).
2. Remove the three (3) screws holding the slip ring assembly to basket shaft.
3. Carefully disconnect the white wire of the slip ring assembly from the set-screw on the basket shaft.
4. Carefully disconnect the black wire of the slip ring assembly from the connector in the basket shaft.
5. Connect one ohm meter probe to the black wire on the basket side of the slip ring assembly, and connect the
other ohm meter probe to the black wire of the slip ring assembly harness. If the metered value is less than 1
ohm, proceed to Step 6. If 1 ohm or greater, replace slip ring assembly and return to Paragraph 65.
6. Connect one ohm meter probe to white wire on the basket side of the slip ring assembly, and connect the other
ohm meter probe to the white wire of the slip ring assembly harness. If the metered value is less than 1 ohm,
proceed to Paragraph 68. If 1 ohm or greater, replace slip ring assembly and return to Paragraph 65.
69. Troubleshooting From Slip Ring Assembly to Moisture Sensing Baffle
and Basket
1. Remove three (3) screws holding slip ring assembly to basket shaft.
2. Carefully disconnect the white wire of the slip ring assembly from the set-screw on the basket shaft.
3. Carefully disconnect the black wire of slip ring assembly from the connector in the basket shaft.
4. Connect one ohm meter probe to the connector in the basket shaft. Connect the other ohm meter probe to the
basket shaft itself. If the metered value is infinite resistance, open load (OL), proceed to Step 5. If not, remove
machine basket and proceed to Paragraph 69.
5. Create a direct short between basket and moisture sensing baffle (Refer to Figure 19).
6. Connect one ohm meter probe to the connector in the basket shaft. Connect the other ohm meter probe to the
basket shaft itself. If the metered value is less than 1 ohm, circuit is functioning properly; double-check
machine configuration and cycle programming. If 1 ohm or greater, remove machine basket and proceed to
Paragraph 69.
70. Troubleshooting from Basket Shaft to Moisture Sensing Baffle with
Machine Basket Removed
1. Disconnect and remove slip ring assembly before removing machine basket.
2. Remove machine basket.
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3. Connect one ohm meter probe to the connector in the basket shaft (Refer to Figure 22).
2
1
TMB2400S
1
2
Connector
Gray Wire Harness Terminal
Figure 22
4. Connect the other ohm meter probe to one of the gray wire harness terminals on the back end of the machine
basket. If the metered value is less than 1 ohm, proceed to Step 5. If 1 ohm or greater, replace harness and
return to Paragraph 65.
5. Connect one ohm meter probe to the connector in the basket shaft.
6. Connect the other ohm meter probe to one of the moisture sensing baffles (Refer to Figure 19). If the metered
value is less than 1 ohm, proceed to Step 9. If 1 ohm or greater, proceed to Paragraph 70.
71. Troubleshooting at the Moisture Sensing Baffles with Machine Basket
Removed
1. Disassemble moisture sensing baffle and inspect for lint buildup and foreign objects. Verify wire harness
connections.
2. Disassemble other moisture sensing baffle and inspect for lint buildup and foreign objects. Verify wire
harness connections.
3. Double-check machine configuration and cycle programming.
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LED OPL Control Troubleshooting
72. Fan Motor Contactor Error
Error Display: E FCon
NOTE: Before performing these checks, the airflow switch must be pulled in, and the motor must be running.
(1)
No
Is there 24 volts AC
at H6-1 to H6-9?
Check Transformer
and Fuse F3.
NOTE: If the voltage is present but
lower than 24 volts AC, ensure the
correct transformer configuration
jumper is installed.
Yes
(2)
Is there 24 volts AC
at H2-6 to H6-9?
No
Replace
I/O Board (AP1).
Yes
(3)
Is there 24 volts AC at
H2-4 to H6-9 with fan
motor running?
Yes
(4)
Is there
5 volts DC at H3-8
to H3- 11 with motor
contactor not engaged and
0 volts DC with motor
contactor
engaged?
Yes
Replace front-end
control (AP2).
No
Check harness and
wire connections at
the motor contactor.
Repair or replace
as required.
NOTE: The following checks are DC
voltage checks.
No
Check control harness
H3 and I/O Board (AP1).
Replace as required.
CAUTION: Always power down the machine
PRIOR to disconnecting or connecting the
H3 harness. Once disconnected, you can
power up the machine for troubleshooting.
Failure to do so may damage the front-end control.
TMB2382S
Please see following page for wiring diagram information.
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Fan Motor Contactor Error
1
4
2
3
TMB2403S
TMB2403S
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LED OPL Control Troubleshooting
73. Rotation Sensor Error
Error Display: E rot
(1)
No
Is the gap from the pulley to
sensor less than 1/4 inch?
Yes
Adjust the gap to
less than 1/4 inch.
NOTE: The following checks are DC
voltage checks.
(2)
Replace harness and/or
sensor. If still not present,
replace front-end control (AP2).
No
Is there a constant 12
volts of DC at H6-1 to H6-3?
Yes
(3)
While turning
the basket by hand
slowly, is there 12 volts DC
at H6-3 to H6-2 when the pulley
spoke is in front of sensor and
0 volts DC as pulley spoke
clears sensor?
No
Replace harness and/or
sensor. If still not present,
replace front-end control (AP2).
Yes
Replace harness and/or
sensor. If still not present,
replace front-end control (AP2).
TMB2392S
TMB2392S
Please see following page for wiring diagram information.
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Rotation Sensor Error
3
2
TMB2389S
TMB2389S
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LED OPL Control Troubleshooting
74. Shorted or Open Thermistor
Error Display: ESH
EoP
(1)
Is there approximately
50k ohms of resistance at 77°F
across H7-1 and H7-2?
Yes
No
Check each wire for possible
ground fault. Replace temperature
sensor and/or harness.
NOTE: This resistance will vary with cabinet air temperature:
the higher the temperature, the lower the resistance.
Replace front-end
control (AP2).
TMB2393S
Please see following page for wiring diagram information.
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Shorted or Open Thermistor
1
TMB2390S
TMB2390S
180
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LED OPL Control Troubleshooting
75. Fuses and Transformer Configuration Jumper
55
66
66
88
11
22
33
44
ORG/WHT
F3
BRN
WHT
BRN/RED
RED
RED
WHT
WHT
RED/BLU
RED/BLU
WHT/BLU
WHT/BLU
2
3
1
4
F4
SEE VOLTAGE
OPTION DIAGRAM
Check F3 and F4 fuses and verify the jumper. Jumper options shown below.
T RAN SFOR MER
J UM PER D ETAIL S
1
2
230-240V
MODELS
BRN/WHT
WHT/BRN
WHT/BRN
240V JUMPER
F3
F4
SECONDARY FUSES
5 X 20mm 3.5A 250V
5 X 20mm 3.25A 250V
1
2
200V & 220V
MODELS
TR AN SFO R M ER
J U MPER DETAI LS
1
380V
MODELS
2
4
2 1
BRN/WHT
TR AN SFOR MER
J U MPER D ETAIL S
6
5
4
3
2
1
208V JUMPER
1
6
5
4
3
2
1
2
3
380V JUMPER
1
400-415V
MODELS
2
4
1
2
3
415V JUMPER
1
460-480V
MODELS
2
4
1
2
3
480V JUMPER
TMB2391S
TMB2391S
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76. Dip Switch/Harness Index Mismatch
Verify the dip switches are in the correct position and the jumper harness is installed on front-end control (AP2).
SW1
SW1
SW1
PROGRAMMING DIP SWITCHES
(SEE INSTALLATION MANUAL
FOR SWITCH DETAILS.)
TMB2388S
TMB2388S
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LED OPL Control Troubleshooting
77. Electronic Control Testing
This feature allows the owner to run diagnostic tests
on various tumble dryer operations without servicing
the tumble dryer. The tests that are available are shown
in Table 1.
For an overview of the manual diagnostic test feature,
refer to the flowchart on the following page.
How to Enter Testing Feature
1. Enter Manual Mode. Refer to Entering the
Manual Mode.
2. Press the Up ( ) or the Down ( ) keypad until
“” appears.
3. Press the Start (
) keypad. Display will
change to “” indicating the control
software version number test.
4. Press the Up ( ) or the Down ( ) keypad to
scroll through the diagnostic test options.
How to Start Tests
To start a diagnostic test, refer to the quick reference
chart below (Table 1). Press the Start (
) keypad
when the desired test is displayed. For detailed
information on each test, read the appropriate description.
How to Exit Testing Feature
Press the Back ( ) keypad. The display will return to
Idle Mode.
Diagnostic (Testing) Mode - Quick Reference Chart
Display
Diagnostic Mode
“”
Control Software Version
“”
Loading Door Status
“”
Lint Door Status
“”
Heater Interlock Test
“”
Fan Motor Contactor Status (  represents input status, open “” or closed “”
“”
Fan Motor Centrifugal Switch Status (  represents input status, open “” or closed “”
“ ”
Cabinet High Limit Thermostat Status (  represents input status, open “” or closed “”
“ ”
Stove High Limit Thermostat 1 Status (  represents input status, open “” or closed “”
“ ”
Stove High Limit Thermostat 2 Status (  represents input status, open “” or closed “”
“”
DIP Switch Status
“”
ICM Alarm Status
“”
ICM Reset Test
“”
External Alarm Test
“”
Dryer On Temperature Test
“”
Thermistor Temperature Test
“”
Machine Config #2 Display
“”
Machine Config #3 Display
“”
Airflow Switch Test
“”
Fan Motor Test
“”
Damper Motor Test*
“”
Reverse Motor Test*
“”
Rotation Sensor Test*
“ ”
Moisture Sensor Test (Shorted test jumper)*
Moisture Sensor Test (Resistance test jumper)*
“ ”
* = Tests only shown if enabled by the DIP switch configuration.
Table 1
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LED OPL Control Troubleshooting
“diAg”
Diagnostic Tests
Press the Start
( / ) keypad.
Press the Up () or
the Down () keypad
to scroll through the
Diagnostic Test options.
“dSoft”
Control Software Version Number Test
To enter a diagnostic test,
press the Start ( / ) keypad.
To exit, press the Back () keypad.
“ddoor”
Loading Door Status
“dLint”
Lint Door Status
“dHEAt”
Heater Interlock Test
“ddiP”
DIP Switch Status
“FCOnXX”
Fan Motor Contactor Status
“diCnAL”
ICM Alarm Status
“FnCSXX”
Fan Motor Centrifugal Switch Status
“diCnrS”
ICM Reset Test
“Cab XX”
Cabinet High Limit Thermostat Status
“dEALrn”
External Alarm Test
“SL XX”
Stove High Limit Thermostat 1 Status
“ddryon”
Dryer On Temperature Test
“SL2 XX”
Stove High Limit Thermostat 2 Status
“dtHEr”
Thermistor Temperature Test
“dConF2”
Machine Config #2 Display
“dConF3”
Machine Config #3 Display
“dAFS”
Airflow Switch Test
“dFAn”
Fan Motor Test
“ddAnPr”
Damper Motor Test
“drEuSE”
Reverse Motor Test
“drotAt”
Rotation Sensor Test
“drnC 1”
Moisture Sensor Test (Shorted)
“drnC 2”
Moisture Sensor Test (Resistance)
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LED OPL Control Troubleshooting
Diagnostic Test Descriptions
Heater Interlock Test “”
Control Software Version Number Test
While this test is running, the control will show the
status of the following inputs for two seconds each.
The control will continue scrolling through the input
status displays until the test is aborted.
This option displays the control software version
number. To start test, control must be in the Testing
Mode. Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “” where “” is the software version
number.
To exit the Software Version Number Test, press the
Back ( ) keypad. The control will return to the testing
mode.
Loading Door Test “”
This option tests the loading door switch. To start test,
control must be in the Testing Mode. Refer to “How to
Enter Testing Feature” at the beginning of this
section.
To start test, the control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press Start (
). Refer to five sections
below for more details on individual statuses.
NOTE: These switches are tested in sequence. If
one switch is sensed open, the rest will be open as
well. For example, if the fan motor contactor switch
is open, all of the switches will be open.
To exit the test, press the Back ( ) keypad. The
control will return to the testing mode.
Fan Motor Contactor Switch “”
To enter, press the Start (
) keypad. The display
will show “” when the loading door switch is
open and “” when the loading door switch is
closed.
The display will show “” if the switch is
sensed open and “” if the switch is sensed
closed.
The loading door switch has to be closed or open for at
least one second for the control to register the switch
as closed or open.
The display will show “” if the switch is
sensed open and “” if the switch is sensed
closed.
To exit the Loading Door Test, press the Back ( )
keypad. The control will return to the testing mode.
Cabinet High Limit Thermostat “ ”
Lint Door Test “ ”
This option tests the lint door switch. To start test,
control must be in the Testing Mode. Refer to “How to
Enter Testing Feature” at the beginning of this
section.
To enter, press the Start (
) keypad. The display
will show “ ” when the lint door switch is open
and “ ” when the lint door switch is closed.
The lint door switch has to be closed or open for at
least one second for the control to register the switch
as closed or open.
Fan Motor Centrifugal Switch “”
The display will show “ ” if sensed open for at
least 1.5 seconds and “ ” if sensed closed for at
least one second.
Stove High Limit Thermostat 1 “
”
The display will show “ ” if sensed open for at
least 1.5 seconds and “ ” if sensed closed for at
least one second.
Stove High Limit Thermostat 2 “ 
The display will show “ ” if sensed open for at
least 1.5 seconds and “ ” if sensed closed for at
least one second.
NOTE: Loading door must be closed while testing
lint door.
To exit the Lint Door Test, press the Back ( ) keypad.
The control will return to the testing mode.
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LED OPL Control Troubleshooting
Dip Switch Status “ ”
The control will show the displays in Table 2
according to the DIP switch configuration. The control
will show which switches are in the ON position. For
example, to verify that DS3, DS5 and DS7 are in the
ON position, the display will show “” (DS3=4,
DS5=16 and DS7 = 64, 4+16+64 =84).
DS8
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
DS7
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
DS6
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
DS5
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
DS4
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
DS3
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
DS2
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
DS1
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Display









Table 2
ICM Alarm Status “ ”
External Alarm Test “”
This option shows the status of the ICM (Ignition
Control Module) Alarm.
This option tests whether the external alarm is
working.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “  ” if the alarm is active for at least
one second or “ ” if the alarm is not active for
one second.
To enter, press the Start (
) keypad. The display
will show “” and the external alarm will
sound until the test is exited.
To exit the test, press the Back ( ) keypad. The
control will return to the testing mode.
To exit this test, press the Back ( ) keypad. The
control will return to the testing mode.
ICM Reset Test “ ”
The ICM Reset Test can be used to both activate the
ICM alarm signal and reset the ICM alarm. When this
test is started, the ICM reset will become active. If the
reset signal is active for a long enough period of time
(4 seconds) the ICM Lockout input will become
active. To reset the ICM, stop the ICM Reset Test and
then start the test again until the ICM Lockout input
becomes inactive (4 seconds) and then stop the ICM
Reset Test. If “ ” shows on the display, ICM
Reset output is active.
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LED OPL Control Troubleshooting
Tumble Dryer On Temperature Test
“”
Machine Configuration Display #2 Test
“”
This option tests the temperature inside the cylinder
while running a cycle.
This option shows the machine configuration values
for the machine type.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “ ” (Fahrenheit) or “ ”
(Celsius). Use the Up ( ) or the Down ( ) keypad to
select desired temperature. Press the Start (
)
keypad to begin cycle. While the test is running the
control will display the temperature estimated in the
cylinder (“  ” or “  ”). Once the cylinder
temperature stabilizes at the target temperature, the
heater is turned off and there is a two minute cool
down period. During cool down, the control will
display the time remaining as “  ”.
To enter, press the Start (
) keypad. The display
will show “ ”, with “” the number
corresponding to the machine capacity. Refer to Table
3.
NOTE: This test does not increment the Total # of
Cycles audit counter.
To exit the test, press the Back ( ) keypad. The
control will return to the testing mode.
Thermistor Temperature Test “”
Value
Description
2
25, 30 Pound Tumble Dryer
4
30, 45 Pound Stack Tumble Dryer
5
35, 55 Pound Tumble Dryer
12
50, 75, F75, 120, 170, 200 Pound Tumble
Dryer
Table 3
To exit Machine Configuration Display #2 Test, press
the Back ( ) keypad. The control will return to the
testing mode.
This option displays the temperature sensed at the
thermistor in 5°F (3°C) increments.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “ ” or “ ”. The “” will show
Fahrenheit, the “” will show Celsius and the “”
will show degrees. If control senses a shorted
thermistor, the display will show “  ”. If the
control senses an open thermistor, the display will
show “  ”.
To exit this test, press the Back ( ) keypad. The
control will return to the testing mode.
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LED OPL Control Troubleshooting
Machine Configuration Display #3 Test
“”
This option shows the machine configuration values
for the machine capacity.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “ ”, with “” representing the
machine capacity. Refer to Table 4.
To exit Machine Configuration Display #3 Test, press
the Back ( ) keypad. The control will return to the
testing mode.
Description
Value
Airflow Switch Test “”
This option shows the current state of the airflow
switch.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “ ” or “ ”, with “ ”
being open and “ ” being closed.
Switch has to be closed for at least one second or open
for at least one second for a valid change.
To exit Airflow Switch Test, press the Back ( )
keypad. The control will return to the testing mode.
Fan Motor Test “”
0
Tumble Dryer
This option shows the fan motor running.
17
25 Pound Tumble Dryer
18
30 Pound Tumble Dryer
19
30 Pound Stack Tumble Dryer
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
20
30 Pound Stack Tumble Dryer – Lower Pocket
21
30 Pound Stack Tumble Dryer – Upper Pocket
22
35 Pound Tumble Dryer
23
45 Pound Stack Tumble Dryer
24
45 Pound Stack Tumble Dryer – Lower Pocket
25
45 Pound Stack Tumble Dryer – Upper Pocket
26
50 Pound Tumble Dryer
27
55 Pound Tumble Dryer
28
75, F75 Pound Tumble Dryer
29
120 Pound Tumble Dryer
30
170 Pound Tumble Dryer
31
200 Pound Tumble Dryer
Table 4
To enter, press the Start (
) keypad. The display
will show “
” to indicate the fan motor is going
to run.
The test must run for at least six seconds before it can
be exited and off for six seconds before the test can be
run again.
NOTE: This test does not count towards the total
machine run time operation.
To exit Fan Motor Test, press the Back ( ) keypad.
The control will return to the testing mode.
Damper Motor Test “”
This option shows the damper motor running.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “” to indicate the damper motor is
going to run.
The test must run for at least six seconds before it can
be exited and off for six seconds before the test can be
run again.
NOTE: This test does not count towards the total
machine run time operation.
To exit Damper Motor Test, press the Back ( )
keypad. The control will return to the testing mode.
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Reverse Motor Test “”
This option shows the reverse motor running.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start (
) keypad. The display
will show “” to indicate the reverse motor is
going to run.
The test must run for at least six seconds before it can
be exited and off for six seconds before the test can be
run again.
NOTE: This test does not count towards the total
machine run time operation.
To exit Reverse Motor Test, press the Back ( )
keypad. The control will return to the testing mode.
Rotation Sensor Test “”
This option shows the RPM of the tumble dryer
cylinder.
To start test, control must be in the Testing Mode.
Refer to “How to Enter Testing Feature” at the
beginning of this section.
To enter, press the Start keypad. The display will show
“”. The display is updated every ten seconds.
The test must run for at least six seconds before it can
be exited and off for six seconds before the test can be
run again.
LED OPL Control Troubleshooting
Moisture Sensor Test (Shorted Test
Jumper) “ ”
This step is skipped if the control is not configured for
Moisture Sensing. When entering this test, the control
will show “ ” while flashing the Start LED one
second on/one second off, allowing the user to short
the cylinder to the baffle (orange jumper). When the
Start key is pressed, this test step energizes the Fan
Motor Contactor and Forward Motor Contactor and
”. The moisture sensor
the control will show “
test is 30 seconds. During this 30 second period, the
control is continually monitoring the moisture sensor
input for the expected short circuit. If an intermittent
signal or high resistance is sensed before the 30
seconds expire, the test is terminated and the control
will show “ ”, indicating that the test has
failed. At this time the user has the option to press the
Back ( ) keypad to return and run the test again. If the
control ran the whole test reading the expected
moisture sensor level and without an intermittent
signal or high resistance, “ ” will be shown. If
either the loading or lint doors are opened during the
test, the control will reset the test step and allow it to
be run again. When the test is complete and result is
displayed, the control sounds a 5 second audio signal.
Press a key to advance to the next test step. If the
Up ( ) or Down ( ) keypad is pressed while the test
is in progress the control will toggle between displays
”, “ ” and “”. If the display is
“
left on “ ” or “” for 5 seconds the
control will revert to showing “ ”
NOTE: This test does not count towards the total
machine run time operation.
To exit Rotation Sensor Test, press the Back ( )
keypad. The control will return to the testing mode.
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LED OPL Control Troubleshooting
Moisture Sensor Test (Resistance Test
Jumper) “ ”
This step is skipped if the control is not configured for
Moisture Sensing. When entering this test, the control
will show “ ” while flashing the Start key LED
one second on/one second off, allowing the user to
place the 510k Ohm resistor between the cylinder and
the baffle (black jumper) which simulates an expected
moisture sensor level. When the Start keypad is
pressed, this step energizes the Fan Motor Contactor
and Forward Motor Contactor and the control will
”. The moisture sensor test is 30
show “
seconds. During this 30 second period, the control is
continually monitoring the moisture sensor input for
the expected moisture sensor level. If an intermittent
signal or unexpected resistance is sensed before the
time expires, the test is terminated and the control will
show “ ”, indicating that the test has failed. At
this time, the user has the option to press the Back ( )
keypad to return and run the test again. If the control
ran the test reading the expected moisture sensor level
and without an inttermittent signal or unexpected
resistance, “ ” will be shown. If either the
loading or lint doors are opened during the test, the
control will reset the test step and allow it to be run
again. When the test is complete and result is
displayed, the control sounds a 5 second audio signal.
Press a key to advance to the next test step. If the
Up ( ) or Down ( ) keypad is pressed while the test
is in progress the control will toggle between
”, “ ” and “”. If the display is
“
left on “ ” or “” for 5 seconds the
control will revert to showing “ ”.
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LED OPL Control Troubleshooting
Production Test Cycle
4. The control will advance through the sequence of
test steps whenever any keypad is pressed, with
the exception of the Keypad Test. Refer to
Table 5 for all tests in the Production Test Cycle.
To Enter Production Test Cycle
1. Be certain control is in Idle Mode.
To Exit Production Test Cycle
2. While pressing and holding the Down ( )
keypad with one hand, press the Back ( )
keypad with the other hand.
3. When the control enters the Production Test
Cycle, it will first display “ ” with the “”
showing the software version of the control.
The test will be exited when the time reaches “” on
the control in the 10 Minute Test Cycle. Otherwise, the
control must be powered down to end the test.
Production Test Cycle Quick Reference Table
Display
Comments
Software Version
 is the software version number.
“ ”
Control Type
2, 3, 4, 5 or 6, depending on brand.
“
Keypad Test
When a key is pressed, the control will display the number assigned to
the keypad. As each keypad is pressed, the control will display the
number assigned to it in the last digit of the display until the next key is
pressed (example, if Key 1 is pressed the control will show “ ”).
When all keypads have been pressed, the control will advance to next
step after a one second delay.
“” or
“”
Loading Door Test
The control will display the status of the loading door: “” if door
is open or “” if door is closed.
“ ” or
“ ”
Lint Door Test
The control will display the status of the lint door: “” if door is
open or “” if door is closed. Loading door must be closed.
All LEDs and
display segments
will light
Show Entire Display Mode The audio signal is turned off. Control will stay in this mode until any
key is pressed.
“
”
Test Mode
”
”
Machine Configuration #2
Display
 is the configuration byte value. The control will remain in this mode
until any key is pressed.
“”
DIP Switch Configuration
The control will show the sum of all switches in the  position. The
control will remain in this mode until any key is pressed.
Degrees in
5°F (3°C)
increments,
“  ”,
“  ”
Thermistor Temperature
Test
The temperature will be displayed in either Fahrenheit or Celsius,
depending on machine’s configuration (refer to Programming Control).
If control senses a shorted thermistor, SH will be displayed. If control
senses an open thermistor, OP will be displayed.
–
Moisture Sensor 1 Test
(Shorted)
Refer to Diagnostic Test Descriptions. Test step lasts for 15 seconds.
–
Moisture Sensor 2 Test
(Resistance)
Refer to Diagnostic Test Descriptions. Test step lasts for 15 seconds.
10 Minute Test Cycle
Determines if tumble dryer can function in a cycle for 10 minutes. Start
pad will flash one second on and one second off. The Start pad can be
used to decrease time remaining. If Start pad is not pressed within 4.25
minutes, the control will return to Idle Mode.
“
“  ”
NOTE: If power to the control is turned off before 10 Minute Test Cycle has ended, the cycle will be
cleared from control.
Table 5
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