DIAGNOSTIC GUIDE DAMP DRY TEST DIAGNOSTIC TEST

DIAGNOSTIC GUIDE DAMP DRY TEST DIAGNOSTIC TEST
TECH SHEET - DO NOT DISCARD
Electrical Shock Hazard
PAGE 1
DIAGNOSTIC GUIDE
DIAGNOSTIC TEST
Before servicing, check the following:
This test allows factory/service personnel to
test and verify all inputs to the electronic
control. The basic operation of this test is to
notify the operator with an audible beep
every time the status of an input to the
control changes state.
■ Is the power cord firmly plugged into a
Disconnect power before
servicing.
live circuit with proper voltage?
■ Has a household fuse blown or circuit
Replace all panels before
operating.
breaker tripped? Time delay fuse?
■ Is dryer vent properly installed and
Failure to do so can result
in death or electrical shock.
clear of lint or obstructions?
■ All tests/checks should be made with a
VOM or DVM having a sensitivity of
20,000 ohms per volt DC or greater.
■ Check all connections before replacing
components. Look for broken or loose
wires, failed terminals, or wires not
pressed into connectors far enough.
IMPORTANT
Electrostatic Discharge (ESD)
Sensitive Electronics
■ The most common cause for control
Do not open package until it is time to
install the electronic board.
failure is corrosion on connectors.
Therefore, disconnecting and
reconnecting wires will be necessary
throughout test procedures.
ESD problems are present everywhere.
ESD may damage or weaken the
electronic board. The new board may
appear to work well after repair is
finished, but failure may occur at a later
date due to ESD stress.
■
■
■
■
Use an anti-static wrist strap.
Connect wrist strap to green ground
connection point or unpainted metal
in the appliance
-ORTouch your finger repeatedly to a
green ground connection point or
unpainted metal in the appliance.
Before removing the part from its
package, touch the anti-static bag to
a green ground connection point or
unpainted metal in the appliance.
■ Connectors: Look at top of connector.
Check for broken or loose wires. Check
for wires not pressed into connector far
enough to engage metal barbs.
■ Resistance checks of components
must be made with power cord
unplugged from outlet, and with wiring
harness or connectors disconnected.
DAMP DRY TEST
Begin with a fully assembled, empty dryer
with clean lint screen. Be sure dryer is
connected to a known good power source.
This test is performed with a fully
assembled dryer, connected to a known
good power source.
Activating the Test Mode
1. Set the following configuration:
■
Door - must be open
■
Signal End of Cycle switch - HIGH
■
Timer - TIMED DRY or AUTO
MOISTURE SENSING PLUS selection
2. Turn the Fabric Care Temperature switch
from AIR FLUFF to ULTRA DELICATE
three times within a five second period.
A single beep, a pause, then a double
beep will sound to indicate that the test
mode is activated.
NOTE: If any of these initial conditions
are not satisfied, the control will not enter
the test mode.
Test Mode Functionality
When the control is in test mode, every
input change of state will result in an
audible beep (with the exception of the
Signal switch). This includes:
■
Door switch
■
Moisture Sensor (short/open Sensor
will result in a beep)
NOTE: A moistened finger or damp
cloth may also be used.
■
Fabric Care Temperature switch
■
Push To Start (PTS) switch (with the
door switch closed)
■
Timer (any cam input change will
result in a beep)
NOTE: Timer will advance during test.
1. Set the following configuration:
■
Door - must be closed
Avoid touching electronic parts or
terminal contacts; handle
electronic board by edges only.
■
Timer - DAMP DRY
■
Fabric Care Temperature switch COTTON / TOWELS HIGH
When repackaging failed electronic
board in anti-static bag, observe
above instructions.
■
Signal switch - HIGH
2. Press the PTS (Push To Start) switch.
After approximately 16 seconds, the
Timer will start to advance to the OFF
position. If this function does not occur,
proceed to the Diagnostic Test.
FOR SERVICE TECHNICIAN'S USE ONLY
If any of the inputs do not result in a beep,
proceed to the corresponding component
tests beginning on page 4.
PART NO. 3979706 REV. A
PAGE 2
TECH SHEET - DO NOT DISCARD
Gas Dryer Wiring Diagram
L1 LINE - BLACK
WHITE - NEUTRAL N
120 VOLTS
MOV
DRUM LAMP
DL
BLACK
TIMER
BK
BU
BLUE
COM HEATER
RELAY R/W
RED
NO
BLK
BU
NO
PTS
MOTOR
RELAY
COM
WGUARD
HEATER
P3-1 HI (48Vdc)
R/W
FS-1
HEATER
FS-2
P3-2 LOW
FS-3
PK/BK
MOTOR
P2-7 START
LOUD
(48Vdc)
PK/BK
BU
BLK
BROWN
ELECTRONIC CONTROL
BLACK PT-1
TIMER
P2-6
DOOR
BU P1-1
MTR
MOIST P2-5
GND
V
P1-2 T2
P2-4
MOIST.
R
P1-3 T3
P2-3
TEMP.
W
P2-2
P1-4 T4
MODEL
P2-1
NEUTRAL
START
SENSE
P1-5
BU/BK
SOFT
D2
G/Y
P3-5
ORG
T/W
P3-4
P3-3
W/BK
SENSOR
Y/R
RED
WHITE
7.5 cubic feet
51.5 ± 3 RPM CW
WHITE
G/Y
THERMISTOR
WRINKLE
GUARD
WHITE
5M
5
2
4
CENTRIFUGAL
SWITCH
MAIN
2.4-3.6
START
2.4-3.8
4M
BLUE
FABRIC
3
BELT
SWITCH
3M
6M
DRIVE MOTOR
IG
1V
1
IGR
IGNITOR
50-500
2
SIGNAL
2
4
1
3
HOLD
1
NC
TF1
4
BLUE 3V
5
VALVE NO. 2
MAIN
HS2
FS2
FS1
22,000 BTU/HR
Blue Violet White
Green/
Black
Yellow
Red
VALVE NO. 1
ASSIST
TF2
RED/WHITE
HS1 HIGH LIMIT
THERMAL FUSE
THERMOSTAT
196 °F
205 °F
BLUE
Drum Speed:
WHITE
DOOR
SWITCH
W/R
RED
Drum Size:
D1
WHITE
GRAY
P3-8
TAN
P3-7
VIO
P3-6
D
BLUE
BLUE
FLAME
SENSOR
Contacts
1M 2M 3M 5M 6M
Function
Start
Red
Run
5
1
PS03
= Contacts closed
CENTRIFUGAL SWITCH (MOTOR)
PLUGGABLE DRIVE MOTOR SWITCH
PS01
Blue
Pink/
Black
BLACK
WHITE
BLUE
Pink/
Black
WHITE
WHITE
BLUE
1
PS02
U1
PT1
GAS VALVE
C25
Blue
DZ7
MOTOR RELAY
R1
R16
DZ5
R2
DZ6
Timer
BU
Wire Colors
BK
R
V
Blue Black Red
W
Violet White
DZ4
100-1288-01
YY DDD XXXX
WHP: 3978949
EH WG2
DOTT
WHP SOFTWARE NO.: 3976631
FSP
Red
R17
C2
R
EVEN HEAT ELECTRONIC
CONTROL ASSEMBLY
B
K
R
Red/
White
B
U
PT-1
DATE
C3 DZ3
W
V
Red/
White
Red
HEATER RELAY
PART NO. 3979706 REV. A
TIMER
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 3
MOTOR STRIP CIRCUIT
L1 LINE - BLACK
WHITE - NEUTRAL
N
120 VOLTS
TIMER
D2
ELECTRONIC CONTROL
BK
BLACK PT-1
BU
TIMER
P1-1
BLUE
P2-6
DOOR
D1
D
BLUE
WHITE
DOOR
SWITCH
MTR
WHITE
BU
P3-2
BLK
HEATER
LOW
BLUE
BU
PK/BK
NO MOTOR
RELAY
PTS
5M
P2-7
COM
PK/BK
BU
BLK
BU/BK
P1-5
MOTOR
START
(48 Vdc)
BLUE
BELT
SWITCH
START
SENSE
CENTRIFUGAL
SWITCH
MAIN
2.4-3.6
4M
START
2.4-3.8
3M
6M
DRIVE MOTOR
BLUE
HEATER STRIP CIRCUIT
L1 LINE - BLACK
WHITE - NEUTRAL N
ELECTRONIC CONTROL
D2
120 VOLTS
BLUE
TEMP.
NEUTRAL
P2-3
RED
P2-1
WHITE
THERMISTOR
D1
DOOR
SWITCH
W/R
WHITE
5M
CENTRIFUGAL
SWITCH
3M
6M
COM
HEATER
RELAY
NO
IGR
IG
1V
RED
WHITE
D
IGNITOR
P3-1
R/W
P3-2
R/W
50-500
HEATER
HI (48 Vdc)
2
1
3
ASSIST
HOLD
HEATER
LOW
NC
TF1
RED
TF2
4
BLUE 3V
THERMAL FUSE
196 °F
HS1
5
MAIN
RED/WHITE
HIGH LIMIT
THERMOSTAT
205 °F
HS2
FS1
FS2
22,000 BTU/HR
VALVE
NO. 1
VALVE
NO. 2
FLAME
SENSOR
MOISTURE SENSOR STRIP CIRCUIT
L1 LINE - BLACK
WHITE- NEUTRAL
120 VOLTS
TIMER
BU
P1-1
TIMER
MTR
MOIST
GND
MOIST.
BU
NEUTRAL
TERMINAL
LINKED TO
CABINET
ELECTRONIC CONTROL
BLACK PT-1
BK
N
NEUTRAL
P2-5
G/Y
P2-4
Y/R
P2-1
W
FOR SERVICE TECHNICIAN'S USE ONLY
SENSOR
G/Y
PART NO. 3979706 REV. A
PAGE 4
TECH SHEET - DO NOT DISCARD
Component Location
Timer
3388228 (2)
Heater Relay
Screws
Heater
Relay
Control Bracket
Ground Wire
in Main Harness
Signal
Switch
Push To Start
(PTS)
Switch
R.H.
End Cap
Motor
Relay
Trim
R.H.
End Cap
NC
Control
Bracket
L.H.
3390646 (2)
End Cap Timer Screws
M
CO
NO
Trim
3390646 (2)
L.H.
End Cap
End Cap
Screws
Console
Panel
COMPONENT
Even Heat
Control Asm
(Includes 2 Retainers)
Fabric Care
Temperature
Switch
PART NUMBER
MODEL NUMBERS MODEL NUMBER MODEL NUMBER
73932 / 73942 / 73952
73954
73956
(White)
(Bisque)
(Graphite)
Console Panel
for WHITE Models:
73932
73942
73952
for BISQUE Model:
73954
for GRAPHITE Model: 73956
End Cap - R. H.
End Cap Trim - R. H.
End Cap - L. H.
End Cap Trim - L. H.
PTS Switch
PTS Knob *
Control Knob *
Signal Switch
Fabric Care Temperature Switch
Motor Relay
Heater Relay
Even Heat Electronic
Control Assembly
Timer Knob *
Console Harness *
Main Harness *
Gas Harness*
Door Switch *
Belt Switch *
Thermal Fuse *
Gas Burner Assembly *
High Limit Thermostat *
Drive Motor *
Thermistor - NTC 10K Ohms *
Timer
3390646
Ground Screw
3388228 (2)
Motor Relay
Screws
COMPONENT TESTS
Supply Connections Test
1. Disconnect dryer from power.
3979018
8528009
8528010
–
–
3949274
3951009
3949280
3951013
3977456
3402570
3402576 (2)
3405151
3399643
3405281
3405281
–
–
–
8528012
–
3949278
3977759
3949284
3977760
3977456
3402569
3402575 (2)
3405151
3399643
3405281
3405281
–
–
–
–
8528011
3949277
3953667
3949283
3953668
3977456
3402567
3402573 (2)
3405151
3399643
3405281
3405281
3978949
3978949
3978949
3402598
3406729
8529973
3401850
3406107
3394881
3390719
8318276
3403140
661655
3976615
8299771
3402597
3406729
8529973
3401850
3406107
3394881
3390719
8318276
3403140
661655
3976615
8299771
3402595
3406729
8529973
3401850
3406107
3394881
3390719
8318276
3403140
661655
3976615
8299771
* not shown in illustration above
PART NO. 3979706 REV. A
2. Remove the cover plate from the back of the dryer and
check that the power cord is firmly connected to the
dryer’s wire harness.
3. Access the electronic control without disconnecting any
wiring to the control board.
4. With an
Power Cord
ohmmeter,
Plug
check for
N
COM
L1
continuity
between the
N
L1
neutral (N)
G
terminal of the
plug and P2-1
G
(white wire)
Power cord terminals.
on the control
board. The
left side of the illustration above shows the position of the
neutral terminal (N) on the power cord plug.
➔ If there is continuity, go to step 5.
➔ If there is no continuity, disconnect the white wire of the
harness from the power cord. Test the continuity of the
power cord neutral wire as illustrated above. If an open
circuit is found, replace the power cord. Otherwise,
replace the main harness.
5. In a similar way, check the continuity between the L1
terminal of the plug and BK (black wire) on the timer.
➔ If there is continuity, go to the Timer Test.
➔ If there is no continuity, disconnect the black wire of the
harness from the power cord. Test the continuity of the
power cord L1 wire as illustrated above. If an open
circuit is found, replace the power cord. Otherwise,
replace the main harness.
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 5
Timer Test
Belt Switch Test
Perform the diagnostic test on page 1 to
determine that the timer motor advances
(should run continuously). If the timer does
not advance or fails the diagnostic test:
1. Disconnect dryer from power.
2. Disconnect belt switch from harness and
check belt switch continuity.
2. Remove the wires from timer terminals.
3. Check the timer motor resistance and
timer switching. The resistance (BU to
PT-1) should be 3 K ohms (±2). Use the
timer encoding table below for switching
conductivity, and refer to timer illustration
on page 2.
Belt Switch
Pulley
Violet
Tan
1
2
4
3
5
FABRIC
2. Remove the wires from the switch to
complete this test.
3. Reference contact continuity with
Pins 1 and 2 to Pin 4 (White).
4. Reference contact continuity with Pin 3
to Pin 5.
TIMER ENCODING TABLE
Drum Belt
FABRIC CARE TEMP. SWITCH TABLE
OFF
W to BK
O
O
O
O
R to BK
X
X
O
O
V to BK
O
X
X
O
BU to BK
X
X
X
O
SWITCH
POSITION
Belt switch in proper run position.
➔ With the belt loose, infinity (open)
should be measured. See illustration
below.
AUTO MOISTURE SENSING PLUS MODE
TIMER
MORE NORMAL DAMP WRINKLE
OFF
CONTACTS DRY
DRY
DRY GUARD
W to BK
X
X
O
O
O
R to BK
O
O
O
O
O
V to BK
X
O
O
X
O
BU to BK
X
X
X
X
O
O = OPEN
Orange
White
Reference contact continuity to timer - BK.
TIMED DRY MODE
TIMED
COOL
WRINKLE
DRY
DOWN
GUARD
1. Disconnect dryer from power.
➔ With the belt switch in the proper run
position, it should measure closed
(motor test measurement can be
done to verify the belt switch). See
illustration below.
1. Disconnect dryer from power.
TIMER
CONTACTS
Fabric Care Temperature Switch
Test
CONTACTS
3-5 2-4 1-4
9 o’clock
O
O
O
NO HEAT
10 o’clock
O
O
X
EXTRA LOW
12 o’clock
O
X
O
MEDIUM
2 o’clock
O
X
X
MEDIUM HIGH
X
O
O
HIGH
3 o’clock
O = OPEN
1. Disconnect dryer from power.
White/Black
Motor Test
2
4
SIGNAL
White
2. Measure resistance between the motor
relay common (COM) terminal and the
P2-6 terminal on the electronic control.
1 to 6 ohms should be measured.
➔ If it does not, perform the Door
Switch and Belt Switch Tests and
check harness continuity. If they test
good, replace the motor.
Tan/White
1
1. Disconnect dryer from power, and open
the dryer door.
3. Measure resistance between the motor
relay common (COM) terminal and
ground. A high resistance (open) should
be measured.
X = CLOSED
Signal End of Cycle Switch Test
X = CLOSED
➔ If resistance measurements are
outside 1 to 6 ohms, perform the
Door Switch Test, the Belt Switch Test
and check harness continuity. If they
test good, replace the motor.
FUNCTION
Belt Switch
Pulley
Belt Switch
Belt loose position.
Door Switch Test
2. Remove the wires from the switch to
complete this test.
3. Reference contact continuity to Pin 4
(White).
SIGNAL END OF CYCLE SWITCH TABLE
1. Disconnect dryer from power.
2. Check door switch continuity. Neutral to
P2-6 on the electronic control should
read closed with the door closed, and
open with the door open.
SWITCH
POSITION
10 o’clock
CONTACTS
2-4
O
O
OFF
12 o’clock
X
O
LOW End
of Cycle Signal
2 o’clock
O
X
HIGH End
of Cycle Signal
3. Otherwise, verify harness continuity.
➔ If no continuity, repair or replace the
harness.
FUNCTION
1-4
O = OPEN X = CLOSED
➔ If harness is good, replace the door
switch.
FOR SERVICE TECHNICIAN'S USE ONLY
PART NO. 3979706 REV. A
PAGE 6
TECH SHEET - DO NOT DISCARD
High Limit Thermostat Test
1. Disconnect dryer from power.
2. Remove the high limit thermostat and
check continuity. Refer to the Thermal
Components illustration below.
➔ If open, replace the high limit
thermostat.
➔ If closed, apply heat. It should open
at about 205°F. Otherwise, replace
the high limit thermostat.
Thermistor Test or Dryer Beeps
3 Times when Push To Start (PTS)
is Pressed
FABRIC CARE
TEMP. SWITCH
SETTING
HEAT
TURNS
OFF
COTTON / TOWELS
An electronic temperature sensor called a
thermistor is used in this model in place of
an operating thermostat. The electronic
control monitors the exhaust temperature
using the thermistor, and cycles the heater
relay on and off to maintain the desired
temperature.
HIGH
150° ± 10°F
NORMAL
PERM PRESS / CASUAL
MEDIUM
ULTRA DELICATE
EXTRA LOW
Procedure
Flame
Sensor
1. Set the following configuration:
Door - must be closed
■
Timer dial - TIMED DRY
■
Fabric Care Temperature switch COTTON / TOWELS HIGH
50°
19.9
100°
5.7
60°
15.3
110°
4.7
Signal End of Cycle switch - HIGH
70°
11.9
120°
3.7
80°
9.2
130°
3.1
90°
7.4
140°
2.5
THERMISTOR RESISTANCE
TEMP. ° F RES. K Ω TEMP. ° F RES. K Ω
2. Press the Push To Start switch.
➔ If you hear three short beeps and the
dryer shuts off after several seconds,
the thermistor or wire harness is
either shorted or open.
➔ Disconnect dryer from power. Check
wire connections at the electronic
control and thermistor. If wiring is
functional, replace the thermistor.
Refer to Thermal Components
illustration on this page.
➔ If the dryer appears to operate
correctly, proceed to step 3.
Thermistor
Thermal Components.
Thermal Fuse Test
A thermal fuse is used on this model. The
thermal fuse is wired in series with the
dryer gas valve. If the thermal fuse opens,
power is shut off to the gas valve.
1. Disconnect dryer from power. Check
continuity of thermal fuse.
115° ± 10°F
■
■
Thermal
Fuse
125° ± 10°F
10°-15°F
below
heat off
➔ If the exhaust temperature is not
within specified limits, disconnect
dryer from power and check the
resistance of the thermistor.
Begin with a fully assembled, empty dryer
and a clean lint screen.
High Limit
Thermostat
140° ± 10°F
MEDIUM HIGH
HEAT
TURNS
ON
3. Remove exhaust vent and start the dryer.
➔ Turn Fabric Care Temperature switch
to desired temperature to be tested,
and select 20 minutes on the Timed
Dry dial. Hold a glass bulb thermometer
capable of reading from 90°F to 180°F
in the center of the exhaust outlet.
Measure exhaust temperatures with
heater off and on.
➔ The correct exhaust temperatures
are as follows:
➔ If the thermistor resistance checks
within normal limits, replace the
electronic control assembly.
Gas Valve Test
1. Disconnect dryer from power.
2. Use an ohmmeter to determine if a gas
valve coil has failed. Remove harness
plugs. Measure resistance across
terminals. Readings should match
those shown in the following chart. If
not, replace coil.
Terminals
Resistance
1 to 2
1365Ω ± 25
1 to 3
560Ω ± 25
4 to 5
1220Ω ± 50
IMPORTANT:
Be sure all harness
wires are looped back
through the strain relief
after checking or replacing coils.
2. Once the thermal fuse has opened, it
must be replaced. Check for failed
thermistor or other causes of failure.
Replace failed parts. See Thermal
Components illustration above.
PART NO. 3979706 REV. A
FOR SERVICE TECHNICIAN'S USE ONLY
TECH SHEET - DO NOT DISCARD
PAGE 7
IMPORTANT: Electrostatic (static electricity) discharge may cause
damage to electronic control assemblies. See page 1 for details.
TROUBLESHOOTING GUIDE
PROBLEM
TROUBLESHOOTING
POSSIBLE CAUSE / TEST
Refer to Motor Strip Circuit, page 3.
– LINE VOLTAGE
– HARNESS/CONNECTION
– MOTOR RELAY
DRYER WILL NOT RUN.
– PUSH TO START (PTS) SWITCH
– BELT/BELT SWITCH
– MOTOR
– DOOR SWITCH
– ELECTRONIC CONTROL
For more details, see Troubleshooting section at right.
DRYER WILL NOT HEAT.
5. Check the belt switch. See Belt Switch
Test, page 5.
– HIGH LIMIT THERMOSTAT
– GAS VALVE
Refer to Heater Strip Circuit, page 3.
– HARNESS/CONNECTION
– HEATER RELAY
– FABRIC CARE TEMPERATURE SWITCH
– ELECTRONIC CONTROL
For more details, see Troubleshooting section at right.
TIMER CONTINUOUSLY
ADVANCES.
3. Check the PTS (Push To Start) switch
continuity when pressed. It should show
continuity while pushed in. If not, replace
the PTS switch.
– HARNESS/CONNECTION
– HEATER RELAY
– THERMAL FUSE
– ELECTRONIC CONTROL
For more details, see Troubleshooting section at right.
DRYER SHUTS OFF BEFORE
CLOTHES ARE DRY.
2. Check connector pins in P2 connector of
the electronic control to verify they are
making good connections.
4. Check the door switch. See Door Switch
Test, page 5.
– THERMISTOR
DRYER WON’T SHUT OFF.
(Refer to Motor Strip Circuit, page 3;
and Troubleshooting Guide at left.)
1. Disconnect dryer from power.
Refer to Heater Strip Circuit, page 3.
– LINE VOLTAGE
– CENTRIFUGAL SWITCH
DRYER HEATS DURING AIR
FLUFF NO HEAT CYCLE.
PROBLEM:
Dryer Will Not Run
Refer to Motor and Moisture Sensor Strip Circuits, page 3.
– PUSH TO START (PTS) SWITCH
– HARNESS/CONNECTION
– MOTOR RELAY
– MOISTURE SENSOR
– ELECTRONIC CONTROL
For more details, see Troubleshooting section, page 8.
Refer to Thermistor Test, page 6; and Moisture Sensor Strip Circuit, page 3.
– HARNESS/CONNECTION
– MOISTURE SENSOR
– THERMISTOR
6. If the motor started but did not continue
to run, and components checked in
steps 2 through 5 were OK, replace the
electronic control assembly.
7. If motor did not start and components
checked in steps 2 through 5 were OK,
replace the motor.
PROBLEM:
Dryer Will Not Heat
(Refer to Heater Strip Circuit, page 3;
and Troubleshooting Guide at left.)
1. Perform Supply Connections Test,
page 4.
2. Perform High Limit Thermostat Test,
page 6.
3. Perform Thermal Fuse Test, page 6.
4. Perform Gas Valve Test, page 6.
PROBLEM:
Dryer Heats During Air Fluff
No Heat Cycle
(Refer to Heater Strip Circuit, page 3;
and Troubleshooting Guide at left.)
1. Perform Fabric Care Temperature Switch
Test, page 5.
– ELECTRONIC CONTROL
– MAY NEED TO CHANGE TIMER SETTING TO A MORE DRY SETTING
For more details, see Troubleshooting section, page 8.
2. With dryer disconnected from power,
check continuity of heater relay contacts.
COM to NO should be open. If not,
replace the heater relay.
Refer to Timer Drawing, page 2; and Motor Strip Circuit, page 3.
– HARNESS/CONNECTION
– TIMER
For more details, see Troubleshooting section, page 8.
3. With dryer fully assembled, reconnect
power to dryer, set to AIR FLUFF. If the
dryer still heats, disconnect dryer from
power and replace the electronic control
assembly.
FOR SERVICE TECHNICIAN'S USE ONLY
PART NO. 3979706 REV. A
PAGE 8
TECH SHEET - DO NOT DISCARD
IMPORTANT: Electrostatic (static electricity) discharge may cause
damage to electronic control assemblies. See page 1 for details.
TROUBLESHOOTING (cont.)
PROBLEM:
Dryer Won’t Shut Off
(Refer to Motor and Moisture Sensor
Strip Circuits, page 3; and
Troubleshooting Guide, page 7.)
1. With the dryer fully assembled, set the
timer to OFF. If the dryer starts running
as soon as it is plugged in, disconnect
dryer from power and replace the timer.
2. Set the following configuration:
■
Dryer - power cord plugged in
■
Door - must be closed
■
Fabric Care Temperature switch COTTON / TOWELS
■
Timer - TIMED DRY for less than
10 minutes
3. If the dryer starts running before the PTS
(Push To Start) switch is pressed,
disconnect dryer from power and
replace the PTS switch.
➔ If, after replacing the PTS switch, the
dryer still starts before the PTS switch
is pressed, disconnect dryer from
power and replace the motor relay.
4. If the dryer does not stop after the set
time elapses, disconnect dryer from
power and check the motor relay.
Continuity of relay should be open from
COM to NO.
PROBLEM:
Dryer Shuts Off Before
Clothes Are Dry
PROBLEM:
Timer Continuously Advances
(Refer to Moisture Sensor Strip Circuit,
page 3; Thermistor Test, page 6;
and Troubleshooting Guide, page 7.)
1. Test the moisture sensor by following the
procedure outlined in the Diagnostic
Test, page 1. If the moisture sensor fails
the Diagnostic Test (does not produce a
beep sound), disconnect the dryer from
power and check the moisture sensor.
➔ If there is continuity to Ground for
Yellow/Red (Y/R) wire with no load,
look for a short in the Sensor or Y/R
wire. Verify harness connections both
at the sensor and the electronic
control.
(Refer to Timer Drawing, page 2;
Motor Strip Circuit, page 3; and
Troubleshooting Guide, page 7.)
1. Disconnect dryer from power and verify
the Blue wire and the Black L1 wires are
in the correct positions. See timer
illustration on page 2.
2. Test the timer by following the procedure
outlined in the Diagnostic Test, page 1.
3. If the timer continues to advance past
OFF, then replace the timer.
➔ If the Sensor and Y/R wire are good,
replace the electronic control
assembly.
2. If Diagnostic Test is passed, verify
thermistor by performing test procedures
outlined in Thermistor Test, page 6.
3. If problem persists after replacing
moisture sensor and thermistor,
disconnect dryer from power and
replace the electronic control assembly.
5. If the dryer will not terminate its cycle
when set to AUTO MOISTURE SENSING
PLUS, disconnect dryer from power and
check the moisture sensor.
➔ If there is continuity to Ground for
Yellow/Red (Y/R) wire with no load,
look for a short in the sensor or Y/R
wire. Verify harness connections both
at the sensor and the electronic
control.
➔ If the sensor and Y/R wire are good,
replace the electronic control
assembly.
MANUFACTURED UNDER ONE OR
MORE OF THE FOLLOWING U.S. PATENTS:
4,385,452
4,430,809
4,663,861
4,669,200
4,700,495
4,720,925
4,754,556
4,821,535
4,840,285
4,865,366
4,899,264
4,899,464
4,908,959
5,066,050
5,243,771
5,560,120
5,636,453
5,651,188
5,664,339
D314,261
D314,262
PART NO. 3979706 REV. A
FOR SERVICE TECHNICIAN'S USE ONLY
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