Whirlpool MGDX700XW Troubleshooting guide

TECH SHEET - DO NOT DISCARD
PAGE 1
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.
DIAGNOSTIC GUIDE
Before servicing, check the following:
■ Make sure there is power at the wall outlet.
■ Has a household fuse blown or circuit breaker tripped?
Was a regular fuse used? Use a time-delay fuse.
■ Is dryer vent properly installed and clear of lint or obstructions?
■ All tests/checks should be made with a VOM
(volt-ohm-milliammeter) or DVM (digital-voltmeter) having a
sensitivity of 20,000 Ω 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.
■ A potential cause of a control not functioning is corrosion on
connections. Observe connections and check for continuity
with an ohmmeter.
■ 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 must be made with dryer unplugged
or power disconnected.
SERVICE DIAGNOSTIC MODE ENTRY
These tests allow factory or service personnel to test and verify
all inputs to the machine control electronics. You may want to do
a quick and overall checkup of the dryer with these tests before
going to specific troubleshooting tests.
ACTIVATING THE SERVICE DIAGNOSTIC MODE
1. Be sure the dryer is in standby mode (plugged in with all
indicators off, or with only the DONE indicator on).
2. Select any three buttons and follow the steps below, using
the same buttons (remember the buttons and the order that
the buttons were pressed):
Within 8 seconds,
Press and Release the 1st selected button,
Press and Release the 2nd selected button,
Press and Release the 3rd selected button;
Repeat this 3 button sequence 2 more times.
3. If this test mode has been entered successfully, all indicators
on the console are illuminated for 5 seconds with 88 showing
in the Estimated Time Remaining two-digit display. If there
are no saved fault codes, all indicators on the console will
momentarily turn off, then only the seven segment display
will come back on and display 88.
SERVICE DIAGNOSTIC MENU TABLE
1st Button
Button Press
Function Behavior
Momentary press
Press and hold for 5 secs.
Activates User Interface/
Control System Test
Exits Service Diagnostics
2nd Button
Momentary press
Press and hold for 5 secs.
Triple Beep
Triple Beep
3rd Button
Momentary press
Press and hold for 5 secs.
Displays Next Error Code
Clears the Error Codes
FOR SERVICE TECHNICIAN’S USE ONLY
IMPORTANT
Electrostatic Discharge (ESD)
Sensitive Electronics
ESD problems are present everywhere. ESD may damage
or weaken the machine control electronics. The new control
assembly 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.
■ Avoid touching electronic parts or terminal contacts;
handle machine control electronics by edges only.
■ When repackaging failed machine control electronics
in anti-static bag, observe above instructions.
Unsuccessful Activation
If entry into diagnostic mode is unsuccessful, refer to the
following indications and actions:
Indication 1: None of the indicators or display turns on.
Action: Select any cycle.
➔ If indicators come on, try to change the function for the
three buttons used to activate the diagnostic test mode.
If any button fails to change the function, something is
faulty with the button, and it will not be possible to enter
the diagnostic mode using that button. Replace the user
interface and housing assembly. See Accessing &
Removing the Electronic Assemblies, page 10.
➔ If no indicators come on after selecting the cycle, go to
TEST #1, page 4.
Indication 2: Console indicators begin flashing immediately.
Action: If console indicators begin flashing on and off
immediately, replace the user interface. See Accessing
& Removing the Electronic Assemblies, page 10.
Activation With Saved Fault Codes
If there is a saved fault code, it will be flashing in the display.
Review the Fault/Error Codes table, page 2, for the recommended
procedure.
If there is no saved fault code, 88 will be displayed.
Fault/Error Code Display Method
Fault codes are displayed by alternately showing F# and E#. All
fault codes have an F# and an E#. The F# indicates the suspect
System/Category. The E# indicates the suspect Component system.
Advancing Through Saved Fault/Error Codes
Procedure for advancing through saved fault codes:
Press and release ➔ beep tone ➔ Most recent fault code is displayed.
the 3rd button
used to activate
Service Diagnostics
Repeat
➔ beep tone ➔ Second most recent fault code is displayed.
Repeat
➔ beep tone ➔ Third most recent fault code is displayed.
Repeat
➔ beep tone ➔ Fourth most recent fault code is displayed.
Repeat
➔ Triple beep, then back to the most recent fault code.
Up to four Fault/Error codes may be stored. When the oldest fault code is
displayed, additional presses of the 3rd button will result in a triple beep, then
display of the most recent fault code. If each press of the 3rd button results in
a triple beep and the display shows 88, no saved fault codes are present.
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
PAGE 2
Each press toggles the motor and heater state. The
display will show the UI ID code. On ➔ Off or Off ➔ On.
Each press toggles state of the least
significant digit (Right) of the seven
segment display. On ➔ Off or Off ➔ On.
Each press toggles state of the most significant
digit (Left) of the seven segment display. On ➔ Off
or Off ➔ On.
First press turns off the Status, Control
Lock, and Lint Screen indicators. Second
press exits Service Diagnostic mode and
dryer returns to standby mode.
temperatures
Rotating the encoder will turn
indicators on and off individually.
On ➔ Off or Off ➔ On.
Each press toggles state of Temp
indicators. On ➔ Off or Off ➔ On.
cycle signal
Each press toggles
state of Signal indicator.
On ➔ Off or Off ➔ On.
Each press toggles state
of Wrinkle Prevent indicator.
On ➔ Off or Off ➔ On.
Figure 1. Console Diagnostics.
dryness level
Each press toggles state of Dryness Level
indicators. On ➔ Off or Off ➔ On.
Clearing Fault Codes
To clear fault codes, enter Service Diagnostic mode. Then press and hold the 3rd button used
to enter Service Diagnostic mode for 5 seconds. Once the fault codes are successfully erased,
the seven segment display will show 88.
FAULT/ERROR CODES The fault codes below would be indicated when attempting
to start a drying cycle, or after activating the service diagnostic mode.
CODE
DESCRIPTION
PF
Power Failure
F 1E 1
Primary Control Failure
F 2E 1
Keypad/User Interface
Failure
F3E 1
Exhaust Thermistor Open
F3E1 indicates that the thermistor is open. See TEST #3a, page 7.
F 3 E 2 Exhaust Thermistor Shorted F3E2 indicates that the thermistor has shorted. See TEST #3a, page 7.
Moisture Sensor Open
F3E 7
Moisture Sensor Shorted
Function
F3E6 indicates that the moisture sensor strip is open. This fault code will ONLY
appear when in the service diagnostic mode. See TEST #4, page 8.
F3E7 indicates that the moisture sensor strip has shorted. This fault code will
ONLY appear when in the service diagnostic mode. See TEST #4, page 8.
USER INTERFACE/
CONTROL SYSTEM TEST
Entry Procedure:
Press and release the first button used to enter
the Service Diagnostic mode. The following
tests will be available.
NOTE: The Service Diagnostic mode must be
activated before activating the User Interface/
Control System test; see procedure on page 1.
Active Fault Code Display
in User Interface/Control System Test:
If the display begins flashing while in User
Interface/Control System test, it is displaying
an active fault code. Active fault codes are
codes that are currently failing. Only one active
fault code can be displayed at a time.
FOR SERVICE TECHNICIAN’S USE ONLY
Diagnostic Test: Console Buttons
and Indicators
Pressing buttons and rotating the cycle
selector will turn off the corresponding indicator
and sound a beep as shown in figure 1,
Console Diagnostics. If indicators fail to come
on and beep after pressing buttons and
rotating the cycle selector, go to TEST #5,
page 9.
NOTE: A second press of the POWER button
while in Console Buttons and Indicators mode
exits the Service Diagnostic mode and returns
the dryer to standby mode.
Diagnostic Test: Door Switch
Opening the door should cause a beep and an
alphanumeric number to be displayed. Closing
the door should cause a beep and 88 to be
displayed.
If opening the door fails to cause a beep and
an alphanumeric number to be displayed, go
to TEST #6, page 9.
1M 2M 3M 5M 6M
Start
Run
= Contacts closed
EXPLANATION AND RECOMMENDED PROCEDURE
PF indicates that a power failure occurred while the dryer was running. Press
START/PAUSE to continue the cycle, or press POWER/CANCEL to clear the display.
F1E1 indicates a primary control failure. Replace the machine control electronics.
See Accessing & Removing the Electronic Assemblies, page 10.
F2E1 indicates a stuck button or user interface mismatch. This fault code will
ONLY appear when in the service diagnostic mode. See TEST #5, page 9.
F3E 6
Contacts
Centrifugal Switch
(Motor)
Blue-White (Elec)
Lt. Blue White (Gas)
Green-Yellow
Black-White
Red
Red
Pluggable Drive Motor
Switch
Black
Blue
White
White
Blue
Gas Valve, Gas Dryer
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
PAGE 3
➔ If the Console ID is not displayed, replace the user
Diagnostic Test: Moisture Sensor
interface and housing assembly. See Accessing &
Removing the Electronic Assemblies, page 10.
➔ If the motor does not turn on, go to TEST #2, page 5.
➔ If no heat is detected, go to TEST #3, page 6.
Open the door and locate two metal strips on the face of the
lint screen housing. Bridge these strips with a wet cloth or a
finger. If a beep is heard and an alphanumeric number is
displayed on the console, the sensor is OK. If not, or if a beep
tone is heard before bridging the moisture strips, go to
TEST #4, page 8.
DEACTIVATING TEST MODES
Deactivating the User Interface/Control System Test
This mode can be exited by either of the two methods listed below:
1. Pressing the POWER button twice.
2. Pressing and holding the 1st button used to activate the Service
Diagnostic mode for 5 seconds.
Diagnostic Test: Console ID, Motor, and Heater
Close the door. Press the START button. The dryer will beep
and the motor and heater will turn on, and the display will show
the following Console ID: 88.
While motor is running, pressing the START button a second
time will turn off the motor and heater. Each additional press
of the START button will toggle the motor and heater on and off.
DEACTIVATING THE SERVICE DIAGNOSTIC MODE
Press and hold the 1st button used to enter the Service
Diagnostic mode for 5 seconds to exit diagnostics.
ELECTRIC DRYER WIRING DIAGRAM
IMPORTANT: Electrostatic (static electricity) discharge may cause
damage to machine control electronics. See page 1 for details.
L1 LINE – BK
R – LINE L2
240 VOLTS
W – NEUTRAL N
120 VOLTS
P2
T
BK
DRUM LAMP
BK
P9-2
VDD P1-8
DATA IN P1-7
VSS P1-6
STROBE P1-5
DATA OUT P1-4
CLOCK P1-3
BUZZER P1-2
+/- 12 VDC P1-1
USER
INTERFACE
LAMP (N.C.)
P8-1
DOOR
P8-4
L1
P5-1 VDD
P5-2 DATA IN
P5-3 VSS
P5-4 STROBE
P5-5 DATA OUT
P5-6 CLOCK
P5-7 BUZZER
P5-8 +/- 12 VDC
NEUTRAL
MOTOR
MTR CS
GND
P2-1 VDD
P2-2 DATA
P2-3 VSS
HEATER
RELAY 1
HEATER +V
N.O.
BK
R
MOIST.
COM
MOIST RTN
HEATER RTN
MODEL
MODEL RTN
EXHAUST TEMP.
EXHAUST
TEMP RTN
N.C.
N.C.
MACHINE CONTROL
ELECTRONICS
NC
P3
P8-3 NEUTRAL
LBU
P8-5
BK-W
5M
THERMAL FUSE
MAIN
4M
Y-R
Y-R
SENSOR
MOVS
P13-2
Y-R
P14-3
R-W
P14-6
R-W
2M
CENTRIFUGAL SWITCH
G-Y
BELT
SWITCH
START
3M
6M
1M
DRIVE MOTOR
1/3 H.P.
SENSOR
G-Y
P14-4
P14-5
R
W
DOOR
SWITCH
W
P8-2 G-Y
P13-1
NEUTRAL
TERMINAL
LINKED TO
CABINET
W
W
LBU
P9-1
NO
BU-W
T
P1
BK
EXHAUST THERMISTOR
10 k
P14-1
P14-2
NC
R
R-W
BK
R
HI LIMIT
THERMOSTAT
THERMAL
CUT-OFF
HEATER
GAS DRYER WIRING DIAGRAM
L1 LINE – BK
W – NEUTRAL N
120 VOLTS
BK
T
P2
DRUM LAMP
BK
USER
INTERFACE
P9-2
LAMP (N.C.)
DOOR
L1
NEUTRAL
P5-1 VDD
P5-2 DATA IN
P5-3 VSS
P5-4 STROBE
P5-5 DATA OUT
P5-6 CLOCK
P5-7 BUZZER
P5-8 +/- 12 VDC
VDD P1-8
DATA IN P1-7
VSS P1-6
STROBE P1-5
DATA OUT P1-4
CLOCK P1-3
BUZZER P1-2
+/- 12 VDC P1-1
P2-1 VDD
P2-2 DATA
P2-3 VSS
BK
N.O.
COM
MOTOR
MTR CS
GND
MOIST.
MOIST RTN
HEATER
RELAY 1
HEATER +V
HEATER RTN
R
MODEL
MODEL RTN
EXHAUST TEMP.
EXHAUST
TEMP RTN
P8-4
P9-1
LBU
P8-5
BK-W
CENTRIFUGAL SWITCH
2M
DOOR
SWITCH
LBU
R
W
P13-2
G-Y
P14-4
Y-R
P14-5
OR
P14-3
R-W
P14-6
R-W
5M
Y-R
Y-R
P13-1
4M
SENSOR
MOVS
SENSOR
BELT
SWITCH
MAIN
G-Y
START
3M
1M
6M
DRIVE MOTOR
1/3 H.P.
BK
R
EXHAUST THERMISTOR
10 k
IG
1V
P14-1
P14-2
VALVE
MOV
NC
TF1
1
2
TF2
R
THERMAL
CUT-OFF
HS1
HI LIMIT
THERMOSTAT
BU
HS2
3
ASSIST
4
5
MAIN
3V
R
IGR
50–500
HOLD
THERMAL FUSE
FOR SERVICE TECHNICIAN’S USE ONLY
W
NO
W
P8-2 G-Y
N.C.
R
P1
P3
T
P8-3 NEUTRAL
N.C.
MACHINE CONTROL
ELECTRONICS
NC
P8-1
FS1
IGNITOR
VALVE
NO. 1
VALVE
NO. 2
FS2
FLAME SENSOR
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
TROUBLESHOOTING
GUIDE
PAGE 4
Some tests will require accessing components.
See figure 2 for component locations.
PROBLEM
POSSIBLE CAUSE / TEST
NOTE: Possible Cause/Tests MUST be performed in the sequence shown for each problem.
1. Supply connections. See TEST #1 at right.
WON’T POWER UP.
(No response when buttons are
2. Check harness connections.
pressed.)
3. User interface and housing assembly. See TEST #5, page 9.
1. If number display flashes, check to be sure the door is completely
shut, and press and hold down Start for about 1 second.
WON’T START CYCLE WHEN
START BUTTON IS PRESSED.
2. See TEST #2, page 5.
3. See TEST #6, page 9.
1. Check Start/Pause button. See TEST #5, page 9.
WON’T SHUT OFF WHEN
2. User interface and housing assembly. See TEST #5, page 9.
EXPECTED.
3. Moisture sensor. See TEST #4, page 8.
CONTROL WON’T ACCEPT
SELECTIONS.
User interface and housing assembly. See TEST #5, page 9.
WON’T HEAT.
1. Heater. See TEST #3, page 6.
2. Check harness connections.
3. Check installation.
HEATS IN AIR CYCLE.
Heater. See TEST #3, page 6.
SHUTS OFF BEFORE CLOTHES
ARE DRY.
1.
2.
3.
4.
5.
TROUBLESHOOTING TESTS
NOTE: These checks are done with the
dryer unplugged or disconnected from
power.
TEST #1 Supply Connections
This test assumes that proper voltage is
present at the outlet, and visual inspection
indicates that the power cord is securely
fastened to the terminal block (electric
dryer) or wire harness connection (gas
dryer).
Remove
Screw
Cover
Plate
Check the dryness setting for Sensor Dry cycles.
Check for full lint screen.
Check for clogged vent.
Moisture sensor. See TEST #4, page 8.
Dryness level adjust. See TEST #4a, page 9.
Figure 3. Remove the cover plate.
ELECTRIC DRYER:
1. Unplug dryer or disconnect power.
See Accessing & Removing the
Electronic Assemblies, page 10, to access:
■ Machine Control Electronics
See Removing the Back
■ User Interface
Panel, page 11, to access:
and Housing
■ Drum Light Assembly
■ Blower Motor Assembly
2. Remove the cover plate from the top
right corner of the back of the dryer.
See figure 3.
3. With an ohmmeter, check for continuity
between the neutral (N) terminal of the
plug and the center contact on the
terminal block. See figure 4.
➔ If there is no continuity, replace the
power cord and test the dryer.
➔ If there is continuity, go to step 4.
Door
Switch
4. In a similar way, check which terminal
of the plug is connected to the
left-most contact on the terminal block
and make a note of it. This will be L1
(black wire) in the wiring diagram. See
figure 4.
N
Power Cord
Plug
L1
Terminal Block
COM
See Removing the
Toe Panel, page 10, to access:
■ Moisture Sensors
■ Exhaust Thermistor
■ Thermal Cut-off
■ High Limit Thermostat
■ Heater Assembly (Electric or Gas)
■ Thermal Fuse
Heater
Assembly
Moisture Sensor
Strips
Figure 4. Plug-to-terminal connections
for electric dryer.
➔ When this is found, go to step 5.
➔ If neither of the plug terminals have
continuity with the left-most contact
of the terminal block, replace the
power cord and test the dryer.
Figure 2. Component locations.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
PAGE 5
5. Access the machine control electronics
without disconnecting any wiring to the
control board. See Accessing &
Removing the Electronic Assemblies,
page 10.
6. With an ohmmeter, check for continuity
between the L1 terminal of the plug
(found in step 4) and P9-2 (black wire)
on the machine control board. See
figure 17, page 10.
➔ If there is continuity, go to step 7.
➔ If there is no continuity, check that
wires to the terminal block are
mechanically secure. If so, replace
the main wire harness and test the
dryer.
7. Check for continuity between the
neutral (N) terminal of the plug and
P8-3 (white wire) on the machine
control board.
➔ If there is continuity, go to step 8.
➔ If there is no continuity and the
mechanical connections of the wire
are secure, replace the main wire
harness.
8. Visually check that the P5 connector
is inserted all the way into the machine
control electronics.
10. If both visual checks pass, replace
the user interface and housing
assembly.
11. Plug in dryer or reconnect power.
Figure 5. Power cord-to-wire harness
connection for gas dryer.
4. Access the machine control electronics
without disconnecting any wiring to the
control board. See figure 16, page 10.
5. With an ohmmeter, check for continuity
between the neutral (N) terminal of the
plug and P8-3 (white wire) on the
machine control board. The left-hand
side of figure 6 shows the position of the
neutral terminal (N) on the power cord
plug. Also see figure 17, page 10.
➔ If there is continuity, go to step 6.
➔ If there is no continuity, disconnect
the white wire of the harness from
the power cord at the location
illustrated in figure 5. Test the
continuity of the power cord neutral
wire as illustrated in figure 6. If an
open circuit is found, replace the
power cord. Otherwise, go to step 6.
10. If both visual checks pass, replace
the user interface and housing
assembly.
11. Plug in dryer or reconnect power.
12. Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
Power Cord
Plug
N
L1
3. Check that the power cord is firmly
connected to the dryer’s wire harness.
See figure 5.
This test will check the wiring to the motor
and the motor itself. The following items
are part of this motor system:
Part of Motor System
Harness/connection
Drive motor
N
L1
Figure 6. Power cord terminals, gas
dryer.
6. In a similar way, check the continuity
between the L1 terminal of the plug
and P9-2 (black wire) on the control
board.
➔ If there is continuity, go to step 8.
➔ If there is no continuity, check the
continuity of the power cord in a
similar way to that illustrated in
figure 6, but for power cord’s L1
wire.
➔ If an open circuit is found, replace the
power cord. Otherwise, go to step 7.
7. Replace the main harness.
8. Visually check that the P5 connector
is inserted all the way into the machine
control electronics.
FOR SERVICE TECHNICIAN’S USE ONLY
TEST #2 Motor Circuit
Belt/belt switch
COM
G
1. Unplug dryer or disconnect power.
13. If indicators still do not light, the
machine control electronics has
failed:
➔ Unplug dryer or disconnect power.
➔ Replace the machine control
electronics.
➔ Plug in dryer or reconnect power.
➔ Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
Thermal fuse
G
GAS DRYER:
2. Remove the cover plate from the top
right corner of the back of the dryer.
See figure 3, page 4.
12. Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
Power Cord
9. Visually check that the user interface
and housing assembly is properly
inserted into the front console.
13. If indicators still do not light, the
machine control electronics has
failed:
➔ Unplug dryer or disconnect power.
➔ Replace the machine control
electronics.
➔ Plug in dryer or reconnect power.
➔ Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
9. Visually check that the user interface
and housing assembly is properly
inserted into the front console.
Wire
Harness
Centrifugal switch
Door switch
Machine control electronics.
See ESD information, page 1.
Electric Gas
Dryer Dryer
✔
✔
✔
✔
✔
✔
✔
✔
no
✔
✔
✔
✔
✔
1. Unplug dryer or disconnect power.
2. Access the machine control electronics
and measure the resistance across
P8-4 and P9-1. See Accessing &
Removing the Electronic Assemblies,
page 10.
➔ If resistance across P8-4 and P9-1 is
in the range of 1 to 6 Ω, replace the
machine control electronics.
➔ Otherwise, go to step 3.
3. Check the wiring and components in
the path between these measurement
points by referring to the appropriate
wiring diagram (gas or electric) on
page 3.
ELECTRIC DRYER ONLY: Check the
thermal fuse. See TEST #3b, page 8.
ALL DRYERS: Continue with step 4,
following on page 6, to test the remaining
components in the motor circuit.
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
4. Check the belt switch and drive motor.
Access the belt switch and drive motor
by removing the back panel. See
Removing the Back Panel, page 11.
Slowly remove the drum belt from the
spring-loaded belt switch pulley, gently
letting the belt switch pulley down. See
figure 7.
PAGE 6
NOTE: Main and Start winding coils
must be checked at the motor.
Winding Resistance
Contact Points
of Measurement
MAIN
Lt. blue wire in back at
pin 4 and bare copper wire
3.3–3.6 Ω
terminal removed from pin 5
of black drive motor switch
START
2.7–3.0 Ω
Belt Switch Pulley
Lt. blue wire in back at
pin 4 and bare copper wire
terminal on pin 3 of black
drive motor switch
➔ If the resistance at the motor is
correct, there is an open circuit
between the motor and machine
control electronics. Check for failed
belt switch.
Drum
Belt
➔ If the Start winding resistance is
much greater than 3 Ω, replace the
motor.
Figure 7. Slowly remove drum belt.
5. Remove the white connector from the
drive motor switch. See figure 8.
Drive Motor
Switch
8. Check the belt switch by measuring
resistance between the two light blue
wires, as shown in figure 10, while
pushing up the belt switch pulley.
White
Connector
1
✔ Heat will not shut off
This test checks the components making
up the heating circuit. The following items
are part of this system:
Part of Heating System
Harness/connection
Heater relay
Thermal cut-off
Thermal fuse
High limit thermostat
Heat element assembly
Gas burner assembly
Centrifugal switch
Exhaust thermistor
Machine control electronics.
See ESD information, page 1.
User interface and
housing assembly
Gas supply
Electric Gas
Dryer Dryer
✔
✔
✔
no
✔
✔
no
✔
✔
✔
✔
✔
✔
✔
✔
no
✔
✔
✔
✔
✔
✔
no
✔
ELECTRIC DRYER:
1. Unplug dryer or disconnect power.
2. Remove the toe panel to access the
thermal components. See Removing
the Toe Panel, page 10.
Belt Switch
Pulley
Belt Switch
Figure 10. Checking the belt switch.
➔ If the resistance reading goes from
infinity to a few ohms as pulley arm
closes the switch, belt switch is OK.
If not, replace the belt switch.
➔ If belt switch is OK and there is still
an open circuit, check and repair
the wiring harness.
5 1
26 4 3
✔ Dryer does not heat
Locate the components using figure 11,
page 7.
5 1
26 4 3
264 3 5
Lt. Blue
Wires
Main Winding:
Lt. Blue Wire in Back
and Bare Copper Wire
Start
Winding:
Lt. Blue Wire
in Back and
Bare Copper
Wire
This test is performed when either of the
following situations occur:
Dryer does not heat:
Figure 8. Remove white connector.
6. Remove the bare copper wire terminal
from pin 5 of black drive motor switch.
See figure 9.
TEST #3 Heater
9. Door Switch problems can be
uncovered by following procedure
under Diagnostic Test: Door Switch,
page 2; however, if this was not done,
the following can be done without
applying power to the dryer. Connect
an ohmmeter across P8-3 (neutral,
white wire) and P8-4 (door, tan wire).
Figure 9. Main and Start winding
measure points.
7. Using figure 9, check for the resistance
values of the motor’s Main and Start
winding coils as shown in the following
table.
FOR SERVICE TECHNICIAN’S USE ONLY
➔ With the door properly closed, the
ohmmeter should indicate a closed
circuit (0–2 Ω).
➔ If not, replace the door switch
assembly.
3. Using an ohmmeter and referring to the
wiring diagram, measure the resistance
from the red wire terminal at the
thermal cut-off to the red wire terminal
at the heater.
➔ If the resistance is about 10 Ω,
go to step 5.
➔ If an open circuit is detected,
go to step 4.
4. Visually check the wire connections
to the thermal cut-off, high limit
thermostat, and heater. If connections
look good, check for continuity across
each of these components.
➔ Replace the heater if it is electrically
open.
➔ Replace both the thermal cut-off and
high limit thermostat if either one is
electrically open.
5. If no open circuit is detected, remove
the P14 connector, then measure the
resistance between P14-3 (red-white
wire) and P14-6 (red-white wire) at the
connector. See figure 17, page 10 for
connector location; and Accessing &
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
PAGE 7
Heater Element
Thermal
Cut-Off
High Limit
Thermostat
Thermal Cut-Off
Flame
Sensor
High Limit Thermostat
Thermal Fuse
Thermal Fuse
Exhaust Thermistor
Exhaust Thermistor
Electric Dryer
Gas Dryer
Figure 11. Thermal Components, viewed from front.
(red-white wire) and P14-6 (red-white
wire) at the connector. See figure 17,
page 10 for connector location; and
Accessing & Removing the Electronic
Assemblies, page 10.
Removing the Electronic Assemblies,
page 10.
➔ If 5–15 kΩ are measured, replace
the machine control electronics.
➔ If the resistance is less than 1 kΩ,
➔ If 5–15 kΩ are measured, replace
replace the exhaust thermistor.
the machine control electronics.
GAS DRYER:
➔ If the resistance is greater than
1. Unplug dryer or disconnect power.
2. Remove the toe panel to access the
thermal components. See Removing
the Toe Panel, page 10.
3. Perform TEST #3b, page 8. If the
thermal fuse is OK, go to step 4.
4. Perform TEST #3c, page 8. If the
thermal cut-off is OK, go to step 5.
5. Locate the high limit thermostat.
See figure 11. Measure the continuity
through it by connecting the meter
probes on the red wire and blue wire
terminals.
➔ If there is an open circuit, replace
the high limit thermostat and thermal
cut-off.
20 kΩ, replace the exhaust thermistor.
TEST #3a Exhaust Thermistor
The machine control electronics monitors
the exhaust temperature using the exhaust
thermistor, and cycles the heater relay on
and off to maintain the desired temperature.
Begin with an empty dryer and a clean lint
screen.
1. Plug in dryer or reconnect power.
2. Start the Timed Dry cycle.
3. If after 60 seconds, F 3 E 1 or F 3 E 2
flashes in the display and the dryer
shuts off, the thermistor or wire harness
is either open or shorted.
➔ Otherwise, go to step 6.
6. Perform TEST #3d, page 8. If this is OK,
replace the machine control electronics.
Heat will not shut off:
1. Unplug dryer or disconnect power.
2. Access the machine control electronics.
Remove the P14 connector, then
measure the resistance between P14-3
FOR SERVICE TECHNICIAN’S USE ONLY
➔ Unplug dryer or disconnect power.
➔ Check wire connections at the
machine control electronics and
thermistor. See Accessing &
Removing the Electronic
Assemblies, page 10, and for
thermistor location, see figure 11.
➔ If wire connections are good,
remove the two wires from the
thermistor and replace the
thermistor.
➔ Plug in dryer or reconnect power.
4. If F 3 E 1 or F 3 E 2 does not flash in
the display, the connections to the
thermistor are good. Therefore, check
the exhaust temperature value at any
or all of the temperature levels in
question, using the Timed Dry cycle,
and the following process:
Hold a glass bulb thermometer capable
of reading from 90° to 180°F (32° to
82°C) in the center of the exhaust
outlet. The correct exhaust
temperatures are as follows:
EXHAUST TEMPERATURES
TEMPERATURE
SETTING
High
Regular
Medium
Low
Extra Low
HEAT TURNS HEAT TURNS
OFF*
ON
155° ± 5°F
(68° ± 3°C)
150° ± 5°F
(66° ± 3°C)
140° ± 5°F
(60° ± 3°C)
125° ± 5°F
(52° ± 3°C)
105° ± 5°F
(41° ± 3°C)
10–15°F
(6–8°C)
below the
heat turn off
temperature
* The measured overshoot using the glass
bulb thermometer in the exhaust outlet
can be 30°F (17°C) higher.
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
5. If the exhaust temperature is not
within specified limits, remove the P14
connector, then measure the resistance
between P14-3 (red-white wire) and
P14-6 (red-white wire) at the connector.
See figure 17, page 10 for connector
location; and Accessing & Removing
the Electronic Assemblies, page 10.
NOTE: All thermistor resistance
measurements must be made while
dryer is unplugged or disconnected
from power.
The following table gives temperatures
and their associated resistance values.
EXHAUST THERMISTOR RESISTANCE
TEMP.
°F (°C)
RES.
kΩ
TEMP.
°F (°C)
RES.
kΩ
50° (10°)
19.0–22.0
80° (27°)
8.5–10.5
60° (16°)
14.8–16.8
90° (32°)
6.8–8.8
70° (21°)
11.5–13.5 100° (38°)
5.0–7.0
➔ If the thermistor resistance does not
agree with table, replace the exhaust
thermistor.
➔ If the thermistor resistance checks
agree with the measurements in the
table, replace the machine control
electronics.
TEST #3b Thermal Fuse
ELECTRIC DRYER: The thermal fuse is
wired in series with the dryer drive motor.
GAS DRYER: The thermal fuse is wired
in series with the dryer gas valve.
ALL DRYERS:
1. Unplug dryer or disconnect power.
2. Access the thermal fuse by first
removing the toe panel. See Removing
the Toe Panel, page 10; and for thermal
fuse location, see figure 11, page 7.
3. Using an ohmmeter, check the
continuity across the thermal fuse.
See figure 11 for location.
➔ If the ohmmeter indicates an open
PAGE 8
➔ If the ohmmeter indicates an open
circuit, replace the failed thermal
cut-off and high limit thermostat.
In addition, check for blocked or
improper exhaust system, or failed
heat element (electric dryer).
TEST #3d Gas Valve,
Gas Dryer Only
1. Unplug dryer or disconnect power.
2. Access the gas valve by removing
the toe panel. See Removing the Toe
Panel, page 10.
3. 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
1 to 2
1 to 3
4 to 5
Resistance
1365Ω ± 25
560Ω ± 25
1220Ω ± 50
IMPORTANT:
Be sure all harness
wires are looped back
through the strain
relief after checking
or replacing coils.
NOTE: This test is started with the
dryer completely assembled.
This test is performed when an automatic
cycle stops too soon, or runs much longer
than expected.
NOTE: Dryer will shut down automatically
after 2½ hours.
The following items are part of this system:
Harness/connection
Metal sensor strips
Machine control electronics. See ESD
information, page 1.
1. Enter Service Diagnostic mode and
select the User Interface/Control
System test. See procedure on page 2.
TEST #3c Thermal Cut-Off
2. Open the dryer door. The dryer should
beep and an alphanumeric number
should be displayed.
1. Unplug dryer or disconnect power.
2. Access the thermal cut-off by first
removing the toe panel. See Removing
the Toe Panel, page 10.
continuous beep tone is heard
before bridging the moisture strips,
continue with step 4.
NOTE: Overdrying may be caused by
a short circuit in the sensor system.
4. Access the moisture sensor wires by
removing the toe panel. See Removing
the Toe Panel, page 10. Disconnect the
sensor wires from the harness. See
figure 12.
Drum
FRONT
MOVs
(Metal Oxide
Varistors)
Harness
Connection
Blower
Housing
TEST #4 Moisture Sensor
circuit, replace the failed thermal
fuse.
If the dryer does not produce heat, check
the status of the thermal cut-off.
➔ If a beep tone is not heard, or a
3. Locate the two metal sensor strips
on the face of the lint screen housing.
Bridge these strips with a wet cloth
or finger.
3. Using an ohmmeter, check the
continuity across the thermal cut-off.
See figure 11, page 7 for location.
➔ If a beep tone is heard and an
alphanumeric number is displayed
on the console, the sensor passed
the test. Go to step 9.
Figure 12. Disconnect sensor from wire
harness.
5. Access the machine control
electronics. See Accessing &
Removing the Electronic Assemblies,
page 10. Remove connector P13
from the circuit board. Check the main
harness connections between the
sensor harness and machine control
for a short or open circuit.
➔ Replace the main harness
if necessary.
➔ If harness is OK, continue with step 6.
6. Access the moisture sensor by
removing the toe panel. See Removing
the Toe Panel, page 10. Disconnect the
sensor from the wire harness. See
figure 12.
7. Measure the resistance
across the outermost
contacts of the cable that
includes the two red MOVs.
➔ If a small resistance is measured,
check for debris across moisture
strips inside the drum; clean if
debris is present. If debris is not
present, replace sensor harness.
➔ If a small resistance is not measured,
continue with step 8.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
PAGE 9
8. Measure the resistance across
each of the outermost
contacts and the center
terminal (ground connection).
➔ If a resistance less than infinity
is measured, replace the sensor
harness.
9. If moisture sensor diagnostic test
passes, check the thermistor: Perform
TEST #3a, page 7.
➔ If the problem persists after
replacing the moisture sensor and
thermistor, replace the machine
control electronics.
TEST #4a Adjusting
Customer-Focused Drying
Modes
NOTE: If the customer is complaining
about the clothes being damp and the
moisture sensor passed TEST #4, step 3,
the total auto dry time can be changed
by choosing one of 3 different CustomerFocused drying modes.
1 = standard auto cycle
2 = 15% more drying time
3 = 30% more drying time
1. Be sure the dryer is in standby mode
(plugged in with all indicators off, or
with only the DONE indicator on).
2. Activate the Customer-Focused Drying
Mode by pressing and holding the
TEMP button for more than 6 seconds.
3. The dryer will beep and CF will be
displayed for 1 second followed by
the current drying setting.
4. To select a different drying mode,
press the TEMP button again. The
dryer display will flash and show 2, 3,
or 1.
NOTE: While cycling through the
settings, the current setting will not
flash, but the other settings will.
5. With the desired drying mode shown,
press the START button to save the
drying mode and exit diagnostics
(the START button in this mode does
not start a drying cycle). The result
will be stored in EEPROM of the
control board, and will be retained
after a power loss.
6. Press the POWER button at any
time to cancel changes and exit
from this mode.
TEST #5 Buttons and Indicators
This test is performed when any of the
following situations occurs during the
Console Buttons and Indicators test in
the User Interface/Control System test,
page 2:
✔ None of the indicators light up
➔ Plug in dryer or reconnect power.
✔ No beep sound is heard
➔ Activate the Service Diagnostic mode
✔ Some buttons do not light
indicators
None of the indicators light up:
1. See Diagnostic Guide/Before
Servicing... on page 1.
2. Perform Test #1, page 4 to verify
supply connections.
3. Perform steps in Accessing and
Removing the Electronic Assemblies,
page 10 and visually check that the P5
connector is inserted all the way into
the machine control electronics.
4. Visually check that the user interface
and housing assembly is properly
inserted into the front console.
5. If both visual checks pass, replace
the user interface and housing
assembly.
6. Plug in dryer or reconnect power.
7. Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
8. If indicators still do not light, the
machine control electronics has failed:
➔ Unplug dryer or disconnect power.
➔ Replace the machine control
electronics.
➔ Plug in dryer or reconnect power.
➔ Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
No beep sound is heard:
1. Perform steps in Accessing and
Removing the Electronic Assemblies,
page 10 and visually check that the P5
connector is inserted all the way into
the machine control electronics.
➔ If visual check passes, replace
the user interface and housing
assembly.
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
Some buttons do not light
indicators:
1. Perform steps in Accessing and
Removing the Electronic Assemblies,
page 10 and visually check that the
user interface and housing assembly
is properly inserted into the front
console.
➔ If visual check passes, replace
the user interface and housing
assembly.
2. Plug in dryer or reconnect power.
3. Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
TEST #6 Door Switch
Perform steps under Activating the Service
Diagnostic Mode, page 1, and activate the
User Interface/Control System test. Then
perform the Door Switch Diagnostic test,
page 2. Functionality is verified with a beep
each time the door is closed and opened,
and an alphanumeric number appears in
the display (i.e., 05).
If any of the above conditions are not met,
or if the dryer Control Software ID listed
above is displayed when the door is closed:
➔ Unplug dryer or disconnect power.
➔ Check that the wires between the
door switch and machine control
electronics are connected. See
figure 13 for switch location, and
see Accessing and Removing the
Electronic Assemblies, page 10.
Door Switch
2. Plug in dryer or reconnect power.
3. Activate the Service Diagnostic mode
per procedure on page 1. Then
activate the User Interface/Control
System test and verify the repair by
completing the Buttons and Indicators
test per procedures on page 2.
4. If replacing the user interface and
housing assembly failed:
➔ Unplug dryer or disconnect power.
➔ Replace the machine control
electronics.
FOR SERVICE TECHNICIAN’S USE ONLY
Figure 13. Door switch location.
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
➔ If the connections are OK, replace
the wire and door switch assembly
and retest.
➔ If wire and door switch assembly
have been replaced and dryer still
does not start, replace the machine
control electronics.
REMOVING THE TOE PANEL
1. Unplug dryer or disconnect power.
PAGE 10
Accessing the Machine Control
Electronics
1. After locating the machine control
electronics, remove the screws that
hold the machine control electronics
bracket in place.
2. Slide the bracket over the top of the
drum to access the machine control
electronics connectors and mounting
screw. See figure 16.
2. Remove two screws below the toe
panel.
Machine Control
Electronics
Assembly
3. Slide the toe panel down, then pull it
out from the bottom. See figure 14.
FRONT
Flange
Mounting
Screw
Machine Control
Electronics
Bracket
Figure 16. Remove machine control
electronics from mounting bracket.
Figure 14. Pull the toe panel down to
clear flange, then pull panel out.
ACCESSING & REMOVING
THE ELECTRONIC
ASSEMBLIES
There are two electronic assemblies:
the User Interface and Housing, and
the Machine Control Electronics. See
figure 15.
Removing the Machine Control
Electronics
of the machine control electronics
that snaps into the mounting bracket.
Press the locking tab on the bottom
of the machine control electronics and
slide the assembly to the front, then lift.
Accessing the User Interface
and Housing Assembly
1. Access the machine control electronics
(see Accessing the Machine Control
Electronics at left) and disconnect the
P5 ribbon cable.
2. The console panel must be removed
to access the user interface and
housing assembly. Remove the knob
from the front of the console panel.
3. The console panel has two locking tabs
on the left and right rear, one locking
tab on the bottom (hidden), and three
snap releases across the top. See
figure 18. Press the locking tab on the
right rear, and gently rotate the console
panel up as you pull the top free of the
three snap releases, finally pressing the
locking tab on the left, and lift the
console panel off.
User Interface
and Housing Assembly
(inside) Snap Releases
1. Remove all the wire connections to the
machine control electronics. See
figure 17.
2. Remove the screw holding the machine
control electronics assembly to the
mounting bracket. See figure 16.
3. There are two plastic legs on the front
of the machine control electronics that
slide under the mounting bracket.
1. Unplug dryer or disconnect power.
✔ There is one plastic leg on the rear of
the machine control electronics that
slides under the mounting bracket.
2. Remove the two rear screws from the
top panel, and slide the top panel to
the rear to remove.
Machine Control
Electronics
Assembly
✔ There is a locking tab on the bottom
N.O. Heater COM
Black Relay 1 Red Lt. Blue Black
User Interface
and Housing Assembly
(inside)
Motor
Relay
Black-White
Tan
White
Green-Yellow
Open
FRONT
Figure 15. Locate the electronic
assemblies.
Figure 17.
FOR SERVICE TECHNICIAN’S USE ONLY
Machine control electronics.
Locking
Tabs
Figure 18. Remove the console panel
to access the user interface and housing
assembly.
Yellow-Red
Red-White
Open
Open (Elec.)
Orange (Gas)
Red-White
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
PAGE 11
Removing the User Interface
and Housing Assembly
The user interface and housing
assembly is held to the console panel
by screws. Remove the screws and
gently lift the user interface and housing
assembly out of the console panel.
See figure 19.
User Interface
and Housing Assembly
Figure 19. Remove screws.
REMOVING THE BACK
PANEL
1. Unplug dryer or disconnect power.
2. Remove the two rear screws from the
top panel, and slide the top panel to
the rear to remove.
3. Remove the cover plate, disconnect the
power cord, and remove ground screw.
4. Remove the metal spring clip between
the back panel and the exhaust outlet.
See figure 20.
Ground Screw
Cover Plate
Metal Spring Clip
Figure 20. Remove 12 screws.
5. Remove the ten screws on the rear,
and two screws on the top of the back
panel. Pull the back panel off the
dryer. See figure 20.
ELECTRIC DRYER: In addition to the
above, remove the terminal block from the
back panel.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10286852B
TECH SHEET - DO NOT DISCARD
PAGE 12
SOFTWARE COPYRIGHTED.
MANUFACTURED UNDER ONE OR MORE
OF THE FOLLOWING U.S. PATENTS:
4669200
4700495
4754556
4840285
4865366
4899464
4908959
05/10
FOR SERVICE TECHNICIAN’S USE ONLY
4989347
5066050
5560120
5809828
6020698
6047486
6199300
6446357
6597144
6604298
6685241
6732447
6784673
6819255
D314261
D314262
D457991
D457992
D495453
PART NO. W10286852B