Whirlpool WED6200SW0 Troubleshooting guide

TECH SHEET - DO NOT DISCARD
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.
PAGE 1
DIAGNOSTIC TESTS
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 DIAGNOSTIC TEST MODE
1. Be sure the dryer is in standby mode (plugged in with all
indicators off, or with only the Clothes Dry indicator on).
2. Select any one button (except Pause/Cancel) and follow the steps
below, using the same button (remember the button):
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.
Press/hold
Release for
Press/hold
Release for
Press/hold
➔
➔
➔
➔
2-5 seconds 2-5 seconds 2-5 seconds 2-5 seconds 2-5 seconds
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.
DIAGNOSTIC: Unsuccessful Entry
If entry into diagnostic mode is unsuccessful, press the Pause/Cancel
button twice, then press the Power button.
➔ If indicators come on, try to use a different button than was used to
activate the diagnostic test mode. If that button fails to enter the
diagnostic mode, something is faulty, and it is not possible to enter
the diagnostic mode. Go to TEST #2, page 6.
➔ If no indicators come on after pressing the Power button, go to
TEST #1, page 6.
DIAGNOSTIC: Saved Fault Codes
If there are saved fault codes, the most recent fault code will
alternately show “F-” and “XX” where XX is the fault code.
Press and release
the same button
used to activate
Diagnostics
Repeat
Repeat
Repeat
➔ beep tone ➔ Second most recent fault code is displayed.
➔ beep tone ➔ Third most recent fault code is displayed.
➔ beep tone ➔ Fourth most recent fault code is displayed.
➔ All indicators momentarily turn off, then stay on.
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? 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 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.
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.
DIAGNOSTIC: Console Buttons and Indicators
Pressing the console buttons or rotating the cycle selector will sound
a beep and will turn on or off the corresponding indicators as shown
in Figure 1, Console Diagnostics, page 2. Pressing Time Adjust
(more time) will sound a beep and turn the left digit of the display on
or off. Pressing Time Adjust
(less time) will sound a beep and turn
the right digit of the display on or off.
➔ If indicators fail to turn on or off and beep after pressing
buttons or rotating the cycle selector, go to TEST #6, page 10.
DIAGNOSTIC: 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 a number and letter
to be displayed, go to TEST #7, page 10.
DIAGNOSTIC: Moisture Sensor
Open the door and locate two metal strips on the inside of the dryer.
Bridge these strips with a wet cloth or a finger.
➔ If a continuous beep tone is heard and an alphanumeric number is
displayed on the console, the sensor is OK.
➔ If not, or if a continuous beep tone is heard before bridging the
moisture strips, go to TEST #5, page 9.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 2
Power button controls
Status indicators at right.
Start button turns on dryer.
Rotating knob turns
indicators on or off.
“Less Time” button
turns the right digit of
the display on or off.
“More Time” button
turns the left digit of
the display on or off.
Dryness button controls
all indicators above button.
Temperature button controls
all indicators above button.
Each button controls
its own indicator.
Turns off all indicators and
exits diagnostic mode.
Figure 1. Console Diagnostics.
DIAGNOSTIC: Motor, Heater, and Console ID
DIAGNOSTIC: Displaying Line Voltage
Close the door. Press the Start button. The motor and heater will turn
on, and the display will show one of the following console IDs:
C0, C1, C2, C3, C4, C5, C6, C7, C8, or C9.
Used to display the line voltage currently being measured by the
machine control:
➔ If none of the Console IDs above are displayed, replace the
user interface assembly. See Accessing & Removing the
Electronic Assemblies, page 11.
➔ If the motor does not turn on, go to TEST #3, page 7.
➔ If no heat is detected, go to TEST #4, page 8.
DIAGNOSTIC: Displaying Inlet Air Flow
Used to display the airflow value at the inlet of the heater box being
measured by the machine control.
After all saved fault codes have been displayed, press the Wrinkle
Shield button to activate airflow detection. A 30 or 50 second
countdown timer will start and the dryer will turn on.
➔ If the dryer is cold, the countdown will start at 50 seconds.
NOTE: If the dryer is extremely cold (less than 40°F [4.4°C]) the
airflow may not be detected properly, and “--” will be displayed.
➔ If the dryer is hot, the countdown timer will start at 30 seconds
(cool down period) followed by an additional 50 second
countdown.
A Dryness modifier LED will also be illuminated to indicate the airflow
range corresponding to the number displayed.
■ The More LED will be illuminated for airflow readings above 40 cfm.
■ The Normal LED will be illuminated for airflow readings between
29 and 40 cfm.
■ The Less LED will be illuminated for airflow readings less than
29 cfm.
➔ If airflow value is low, check to make sure the lint screen is
clean, the door seal is in place and the vent is not obstructed.
After all saved fault codes have been displayed, press the Cycle
Signal button. The last 2 digits of the voltage value will be displayed
on the dual 7-segment display.
A Dryness modifier LED will also be illuminated to indicate the
voltage range corresponding to the number displayed. The Dryness
LEDs relate to specific voltage ranges as follows:
■ The More LED will be illuminated for high voltage readings (above
260 VAC).
■ The Normal LED will be illuminated for normal voltage readings
(200-260 VAC).
■ The Less LED will be illuminated for low voltage readings (below
200 VAC).
➔ If the line voltage is not seen on L2 the display will flash L2.
Go to TEST #1, page 6.
DEACTIVATING THE DIAGNOSTIC TEST MODE
Press the Pause/Cancel button twice to exit diagnostics.
ACTIVATING THE MANUAL LOAD TEST
1. Be sure the dryer is in standby mode (plugged in with all
indicators off, or with only the Clothes Dry indicator on).
2. Select any one button (except Pause/Cancel) and follow the steps
below, using the same button (remember the button):
Press/
Release
Press/
Release
Press/
Release
Press/
hold 2-5 ➔ for 2-5 ➔ hold 2-5 ➔ for 2-5 ➔ hold 2-5 ➔ for 2-5 ➔ hold 2-5
seconds seconds seconds seconds seconds seconds seconds
88 flashes momentarily, the motor starts right away, and the Heavy
Duty LED flashes (this step starts the Manual Load sequence):
1. Turn on motor. ➔ Flash “Heavy Duty” LED.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
Now press any key (except Pause/Cancel) and the control will
advance through each step of the following sequence:
PAGE 3
TROUBLESHOOTING GUIDE
Some tests will require accessing components. See figure 2, page 6 for
component locations.
SINGLE ELEMENT MODELS:
➔ Flash “Casual” LED.
2. Motor + heater.
3. No loads on (motor + heater off). ➔ Flash “Normal” LED.
4. Repeat using same button.
2. Motor + heater 1.
➔ Flash “Casual” LED.
3. Motor + heater 2.
➔ Flash “Timed Dry” LED.
4. Motor + heater 1 + heater 2 + drum light. ➔ Flash “Drum Light” LED.
5. No loads on (motor + heaters off). ➔ Flash “Normal” LED.
➔ Start sequence again at 1.
POSSIBLE CAUSE / TEST
NOTE: Possible Cause/Tests MUST be performed
in the sequence shown for each problem.
➔ Start sequence again at 1.
DUAL ELEMENT MODELS:
6. Repeat using same button.
PROBLEM
1. Supply connections. See TEST #1, page 6.
2. Check harness connections.
3. User interface assembly. See TEST #6, page 10.
WON’T POWER UP.
(No response when
buttons are pressed.)
1.
WON’T START CYCLE
WHEN START BUTTON
IS PRESSED.
2.
3.
If number display flashes, check to be sure the
door is completely shut, and press and hold down
START for about 1 second.
See TEST #3, page 7.
See TEST #7, page 10.
Press the Pause/Cancel button to exit this mode.
WON’T SHUT OFF
WHEN EXPECTED.
1. Check Pause/Cancel button. See TEST #6,
page 10.
2. User interface assembly. See TEST #6, page 10.
3. Moisture sensor. See TEST #5, page 9.
DISPLAY FAULT CODES
CONTROL WON’T
ACCEPT SELECTIONS.
User interface assembly. See TEST #6, page 10.
WON’T HEAT.
1. Heater. See TEST #4, page 8.
2. Check harness connections.
3. Check installation.
HEATS IN AIR CYCLE.
Heater. See TEST #4, page 8.
DEACTIVATING THE MANUAL LOAD TEST
The fault codes below would be indicated when attempting to start a
drying cycle or after activating the diagnostic test mode.
DISPLAY
DESCRIPTION
PF
Power
Failure
AF
Restricted
Airflow
Condition
F-01
Primary
Control
Failure
F-02
Keypad/
User Interface
Failure
F-26
Exhaust
Thermistor
Open
Exhaust
Thermistor
Shorted
Inlet
Thermistor
Open
Inlet
Thermistor
Shorted
Motor Drive
System Failure
F-28
Moisture
Sensor Open
F-29
Moisture
Sensor
Shorted
F-30
Restricted
Airflow
Condition
F-22
F-23
F-24
F-25
EXPLANATION / RECOMMENDED PROCEDURE
PF flashes to indicate that a power failure
occurred while the dryer was running. Press
START to continue the cycle, or press
Pause/Cancel to clear the display.
AF flashes if a restricted airflow condition exists.
Check to make sure the lint screen is clean, the
door seal is in place and the vent is not
obstructed.
F-01 flashes when there is a primary control
failure. Replace the machine control electronics.
See Accessing & Removing the Electronic
Assemblies, page 11.
F-02 flashes when there is a stuck button or user
interface mismatch. This fault code will ONLY
appear when in the diagnostic test mode. See
TEST #6, page 10.
F-22 flashes if the exhaust thermistor is open.
See TEST #4a, page 8.
1.
2.
3.
4.
5.
SHUTS OFF BEFORE
CLOTHES ARE DRY.
Check the dryness setting for auto cycles.
Check for full lint screen.
Check for clogged vent.
Moisture sensor. See TEST #5, page 9.
Dryness adjust. See Adjusting Customer-Focused
Drying Modes, page 10.
PLUGGABLE DRIVE MOTOR SWITCH
Blue Blue-White
Green-Yellow
Black-White
Red
Red
F-23 flashes if the exhaust thermistor has
shorted. See TEST #4a, page 8.
F-24 flashes if the inlet thermistor is open.
This fault code will ONLY appear when in the
diagnostic test mode. See TEST #4a, page 8.
F-25 flashes if the inlet thermistor is shorted.
This fault code will ONLY appear when in the
diagnostic test mode. See TEST #4a, page 8.
F-26 flashes if there is a motor drive system
failure. See TEST #3, page 7.
F-28 flashes if the moisture sensor strip is open.
This fault code will ONLY appear when in the
diagnostic test mode. See TEST #5, page 9.
F-29 flashes if the moisture sensor strip has
shorted. This fault code will ONLY appear when in
the diagnostic test mode. See TEST #5, page 9.
F-30 flashes if a restricted airflow condition
exists. This fault code will ONLY appear when in
the diagnostic test mode. Check to make sure the
lint screen is clean, the door seal is in place and
the vent is not obstructed.
FOR SERVICE TECHNICIAN’S USE ONLY
CENTRIFUGAL SWITCH (MOTOR)
Contacts
Function
1M 2M 3M 5M 6M
Start
Run
= Contacts closed
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 4
ELECTRIC DRYER WIRING DIAGRAMS
IMPORTANT: Electrostatic (static electricity) discharge may cause
damage to machine control electronics. See page 1 for details.
SINGLE ELEMENT MODEL
L1 LINE – BK
R – LINE L2
240 VOLTS
W – NEUTRAL N
120 VOLTS
BK
BK
BR P8-1
LAMP LOAD
NEUTRAL
DRUM LAMP
P9-2
L1
DOOR
USER INTERFACE
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
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
P2-1 VDD
P2-2 DATA
P2-3 VSS
R
COM
MTR CS
MOIST.
HEATER
RELAY 1
P8-4
T
P8-2
G-Y
W
NC
BU
NO
P9-1
P8-5
BK-W
P13-1
P13-2
MODEL
P4-4
MODEL RTN
P4-5
OUTLET TEMP.
OUTLET
TEMP RTN
INLET TEMP.
MACHINE
INLET
CONTROL
TEMP RTN
ELECTRONICS
Y-R
BELT
SWITCH
DOOR
SWITCH
CENTRIFUGAL SWITCH
2M
G-Y
3M
6M
1M
DRIVE MOTOR
1/3 H.P.
SENSOR
G-Y
R
W
MAIN
1.4–2.6 Ω
START
1.4–2.8 Ω
4M
Y-R
Y-R
W
5M
THERMAL FUSE
196°F (91°C)
NEUTRAL
TERMINAL
LINKED TO
CABINET
W
BU
BU
SENSOR
MOVS
MOIST RTN
N.O.
BK
GND
MOTOR
P8-3 NEUTRAL
BK
P4-3
R
EXHAUST THERMISTOR
P4-6
R
10k Ω
P4-2
R
INLET THERMISTOR
P4-1
R
50k Ω
NC
R
R-W
HIGH LIMIT
THERMOSTAT
295°F (146°C)
THERMAL
CUT-OFF
309°F (154°C)
R
HEATER
5400 W
DUAL ELEMENT MODEL
L1 LINE – BK
R – LINE L2
240 VOLTS
W – NEUTRAL N
120 VOLTS
BR P8-1
BK
BK
DRUM LAMP
P9-2
LAMP LOAD
NEUTRAL
L1
DOOR
USER INTERFACE
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
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
BK
THERMAL
CUT-OFF
309°F (154°C)
P2-1 VDD
P2-2 DATA
P2-3 VSS
BK
HEATER
RELAY 1
R-W
BK
MTR CS
MOIST.
HEATER
RELAY 2
P8-4
T
P8-2
G-Y
P9-1
P8-5
W
W
BU
NO
BK-W
Y-R
P13-1
P13-2
MODEL
P4-4
MODEL RTN
P4-5
OUTLET
TEMP RTN
INLET TEMP.
MACHINE
INLET
CONTROL
TEMP RTN
ELECTRONICS
4M
Y-R
G-Y
Y-R
BELT
SWITCH
SENSOR
CENTRIFUGAL SWITCH
MAIN
1.4–2.6 Ω
START
1.4–2.8 Ω
2M
G-Y
3M
6M
1M
DRIVE MOTOR
1/3 H.P.
BK
P4-3
R
EXHAUST THERMISTOR
P4-6
R
10k Ω
P4-2
R
INLET THERMISTOR
P4-1
R
50k Ω
R
V
HEATER
2700 W
R
HEATER
2700 W
FOR SERVICE TECHNICIAN’S USE ONLY
R
W
DOOR
SWITCH
5M
THERMAL FUSE
196°F (91°C)
NEUTRAL
TERMINAL
LINKED TO
CABINET
W
BU
BU
SENSOR
MOVS
OUTLET TEMP.
N.O.
COM
MOTOR
MOIST RTN
N.O.
COM
GND
P8-3 NEUTRAL
NC
NC
HIGH LIMIT
THERMOSTAT
180°F (82°C)
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 5
DRIVE MOTOR STRIP CIRCUIT
L1 LINE – BK
N
120 VOLTS
NC
W
P9-2
BK
L1
DOOR
P8-4
T
BU
NO
W
MOTOR
P9-1
5M
THERMAL FUSE
196°F (91°C)
MACHINE
CONTROL
ELECTRONICS
W
DOOR
SWITCH
BU
BU
MAIN
1.4 – 2.6 Ω
START
1.4 – 2.8 Ω
4M
BELT
SWITCH
NEUTRAL TERMINAL
LINKED TO CABINET
CENTRIFUGAL SWITCH
2M
G-Y
3M
6M
1M
DRIVE MOTOR
1/3 H.P.
HEATER – SINGLE ELEMENT STRIP CIRCUIT
L1 LINE – BK
R – LINE L2
240 VOLTS
R
5M
N.O.
BK
R
COM
OUTLET TEMP.
HEATER
RELAY 1
OUTLET
TEMP RTN
INLET TEMP.
MACHINE
INLET
CONTROL
TEMP RTN
ELECTRONICS
P4-3
R
P4-6
R
P4-2
R
P4-1
R
EXHAUST THERMISTOR
CENTRIFUGAL SWITCH
2M
G-Y
10k Ω
INLET THERMISTOR
3M
50k Ω
6M
1M
NC
R
R-W
THERMAL CUT-OFF
309°F (154°C)
R
HIGH LIMIT
THERMOSTAT
295°F (146°C)
HEATER
5400 W
HEATER – DUAL ELEMENT STRIP CIRCUIT
L1 LINE – BK
R – LINE L2
240 VOLTS
BK
THERMAL
CUT-OFF
309°F (154°C)
R
BK
5M
N.O.
COM
R-W
BK
HEATER
RELAY 1
COM
HEATER
RELAY 2
2M
G-Y
OUTLET TEMP.
N.O.
CENTRIFUGAL SWITCH
OUTLET
TEMP RTN
INLET TEMP.
MACHINE
INLET
CONTROL
TEMP RTN
ELECTRONICS
P4-3
R
P4-6
R
P4-2
R
P4-1
R
EXHAUST THERMISTOR
3M
10k Ω
6M
1M
INLET THERMISTOR
HEATER
2700 W
50k Ω
V
R
V
HEATER
2700 W
R
R
NC
HIGH LIMIT
THERMOSTAT
180°F (82°C)
MOISTURE SENSOR STRIP CIRCUIT
W – NEUTRAL N
L1 LINE – BK
120 VOLTS
BK
P9-2
L1
NEUTRAL
MOIST.
P8-3 NEUTRAL
P13-1
MACHINE
CONTROL
ELECTRONICS
MOIST RTN
FOR SERVICE TECHNICIAN’S USE ONLY
W
Y-R
Y-R
SENSOR
MOVS
SENSOR
G-Y
P13-2
Y-R
BK
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 6
6. Access the machine control electronics
without disconnecting any wiring to the
control board. See Accessing &
Removing the Electronic Assemblies,
page 11.
7. With an ohmmeter, check for continuity
between the L1 terminal of the plug
(found in step 5) and P9-2 (black wire) on
the machine control board. See figure 15,
page 11.
➔ If there is continuity, go to step 8.
➔ 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.
8. 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 9.
➔ If there is no continuity and the
mechanical connections of the wire are
secure, replace the main wire harness.
9. Visually check that the P5 connector is
inserted all the way into the machine
control electronics.
10. Visually check that the user interface
assembly is properly inserted into the
front console.
11
11. If both visual checks pass, replace the
user interface assembly.
12. Plug in dryer or reconnect power.
13. Perform the Console Buttons and
Indicators Diagnostic test, page 1, to
verify repair.
Figure 2. Component locations.
TROUBLESHOOTING TESTS
NOTE: These checks are done with the dryer
unplugged or disconnected from power.
4. 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.
Terminal Block
Power Cord
Plug
TEST #1 Supply Connections
L1
N
This test should only be done after
confirming proper voltage at the outlet.
2. Remove the cover plate from the back of
the dryer. See figure 3.
COM
Remove Screw
Figure 4. Plug-to-terminal connections.
➔ If there is no continuity, replace the
power cord and test the dryer.
➔ If there is continuity, go to step 5.
5. 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 and the
appropriate wiring diagram, page 4.
Figure 3. Remove the cover plate.
3. Make sure the power cord is securely
fastened to the terminal block.
FOR SERVICE TECHNICIAN’S USE ONLY
➔ Unplug dryer or disconnect power.
➔ Replace the machine control
electronics.
➔ Plug in dryer or reconnect power.
➔ Perform the Console Buttons and
Indicators Diagnostic test, page 1 to
verify repair.
1. Unplug dryer or disconnect power.
Cover
Plate
14. If indicators still do not light, the
machine control electronics has failed:
➔ When this is found, go to step 6.
➔ 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.
TEST #2 Machine Control
Power Check
This test is used to determine if power is
present at the machine control electronics.
NOTE: The drum light is controlled by the
machine control on all models.
1. Plug in dryer or reconnect power.
2. Open the door.
➔ If the drum light illuminates, then
power is present at the machine
control. Go to TEST #6, page 10.
➔ If the drum light fails to illuminate,
do not assume the machine control
electronics needs replacement.
Several conditions may cause the
drum light not to illuminate, including
a bad bulb. If the drum light does not
illuminate, go to TEST #1.
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 7
➔ 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.
TEST #3 Drive Motor Circuit
This test will check the wiring to the motor
and the motor itself. The following items are
part of this motor system:
– Harness/
connection
– Thermal fuse
– Belt/belt switch
– Drive motor
– Centrifugal switch
– Door switch
– Machine control
electronics. See ESD
information, page 1.
1. Unplug dryer or disconnect power.
➔ If the Start winding resistance is much
greater than 4 ohms, replace the motor.
8. Check the belt switch by measuring
resistance between the two blue wires as
shown in figure 8, while pushing up the
belt switch tension pulley.
Drive Motor
Switch
2. Access the machine control electronics
and measure the resistance across P8-4
and P9-1. See Accessing & Removing the
Electronic Assemblies, page 11.
Belt Switch
Tension Pulley
White
Connector
➔ If resistance across P8-4 and P9-1 is in
the range of 1 to 6 ohms, 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 and strip circuit, pages 4 and 5.
Figure 6. Remove white connector.
4. Check the thermal fuse. See TEST #4b,
page 9.
Main Winding:
Blue Wire in Back and Bare
Copper Wire (5 Position)
5. Check the belt switch and drive motor.
Access the belt switch and drive motor by
removing the front panel/drum assembly.
See Removing the Front Panel/Drum
Assembly, page 11. Slowly remove the
drum belt from the spring-loaded belt
switch tension pulley, gently letting the
pulley down. See figure 5.
Belt Switch
Tension Pulley
Blue Wires
(Back and 4 Position)
Figure 8. 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.
Belt Switch
➔ If belt switch is OK and there is still an
open circuit, check and repair the
wiring harness.
Drum Belt
Start Winding:
Blue Wire in Back and Bare
Copper Wire (3 Position)
Figure 7. Main and start winding
measure points.
Figure 5. Slowly remove drum belt.
6. Remove the white connector from the
drive motor switch. See figure 6.
7. Using figure 7, check for the resistance
values of the motor’s Main and Start
winding coils as shown in the following
table.
NOTE: Main and Start winding coils must
be checked at the motor.
WINDING RESISTANCE
Ω
MAIN
START
FOR SERVICE TECHNICIAN’S USE ONLY
CONTACT POINTS OF
MEASUREMENT
1.4–2.6
Blue wire in back at
pin 4 and bare copper
wire on pin 5 of black
drive motor switch
1.4–2.8
Blue wire in back at
pin 4 and bare copper
wire on pin 3 of black
drive motor switch
9. Door switch problems can be uncovered
in the Door Switch Diagnostic Test, page 1;
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).
➔ With the door properly closed, the
ohmmeter should indicate a closed
circuit (0–2 ohms).
➔ If not, replace the door switch
assembly. See figure 11, page 10; and
Removing the Front Panel/Drum
Assembly, page 11.
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
TEST #4 Heater
This test is performed when either of the
following situations occur:
✔ Dryer does not heat
PAGE 8
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.
✔ Heat will not shut off
This test checks the components making up
the heating circuit. The following items are
part of this system:
– Harness/
connection
– Heater relay
– Thermal cut-off
– Inlet thermistor/
high limit
thermostat
– Heat element
assembly
– Centrifugal switch
– Exhaust thermistor
– Machine control
electronics. See
ESD information,
page 1.
– User interface
assembly
➔ 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
P4 connector, then measure the
resistance between P4-3 (red wire) and
P4-6 (red wire) at the connector. See
figure 15, page 11 for connector location;
and Accessing & Removing the
Electronic Assemblies, page 11.
➔ If 5–15 k ohms are measured, replace
the machine control electronics.
➔ If the resistance is less than 1 k ohm,
replace the thermistor.
Dryer does not heat:
Locate the components using figure 2,
page 6; and figure 9, below.
DUAL ELEMENT MODEL:
SINGLE ELEMENT MODEL:
1. Unplug dryer or disconnect power.
1. Unplug dryer or disconnect power.
2. Remove the back panel to access the
thermal components. See Removing the
Back Panel, page 12.
2. Remove the back panel to access the
thermal components. See Removing the
Back Panel, page 12.
3. Using an ohmmeter and referring to the
appropriate wiring diagram and strip
circuit, pages 4 and 5, measure the
resistance from the red wire terminal at
the thermal cut-off to the red wire terminal
at the heater.
3. Measure the resistance across the high
limit thermostat.
➔ If an open circuit is not detected, go to
step 4.
➔ If an open circuit is detected, replace
both the thermal cut-off and the inlet
thermistor/high limit thermostat.
4. Measure the resistance across the
thermal cut-off
Lint Duct
➔ If an open circuit is not detected, go to
step 5.
➔ If an open circuit is detected, replace
both the thermal cut-off and the inlet
thermistor/high limit thermostat.
Drum
Light
Harness
Connection
Sensor
Wires
5. Measure the resistance between the red
wires at the heater.
Heat will not shut off:
1. Unplug dryer or disconnect power.
2. Access the machine control electronics,
remove the P4 connector, then measure
the resistance between P4-3 (red wire)
and P4-6 (red wire) at the connector. See
figure 15, page 11 for connector location;
and Accessing & Removing the
Electronic Assemblies, page 11.
➔ If 5–15 k ohms are measured, replace
the machine control electronics.
➔ If the resistance is greater than
20 k ohms, replace the exhaust
thermistor.
TEST #4a Thermistors
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-22 or F-23 flashes
in the display and the dryer shuts off, the
thermistor or wire harness is either open
or shorted.
➔ Unplug dryer or disconnect power.
6. Visually check the wire connections to
the heater. If the connections look good,
replace the heater.
➔ If wire connections are OK, check the
exhaust thermistor resistance per
step 5.
➔ If an open circuit is not detected, go to
step 9.
Thermistor Thermal Heat Inlet Thermistor/
Fuse Element High Limit
Thermostat
➔ If the resistance is about 10 ohms, go
to step 5.
➔ If the resistance is less than 1 k ohm,
replace the exhaust thermistor.
➔ If an open circuit is detected, go to
step 6.
7. Measure the resistance at the heater
between the violet wire and the red wire
terminals.
Figure 9. Thermal components, viewed
from rear.
➔ If 5–15 k ohms are measured, replace
the machine control electronics.
➔ Check wire connections at the
machine control electronics and
thermistor. See Accessing & Removing
the Electronic Assemblies, page 11;
and for thermistor location, figure 9.
➔ If an open circuit is not detected, go to
step 7.
Thermal
Cut-Off (TCO)
4 Duct
Screws
9. If no open circuit is detected, remove the
P4 connector, then measure the
resistance between P4-3 (red wire) and
P4-6 (red wire) at the connector. See
figure 15, page 11 for connector location;
and Accessing & Removing the
Electronic Assemblies, page 11.
➔ If an open circuit is detected, go to
step 8.
8. Visually check the wire connections to
the heater. If the connections look good,
replace the heater assembly.
4. If F-22 or F-23 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:
➔ If an open circuit is detected, go to
step 4.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 9
➔ If wire connections are good, remove
the wires from the inlet thermistor/high
limit thermostat assembly and replace
the assembly.
EXHAUST TEMPERATURES
TEMPERATURE HEAT TURNS OFF* HEAT TURNS ON
SETTING
°F (°C)
°F (°C)
High
155°±5° (68°±3°)
Medium
140°±5° (60°±3°)
Low
Extra Low
10°–15° (6°–8°)
below the
125°±5° (52°±3°) heat turn off
temperature
105°±5° (41°±3°)
* The measured overshoot using the glass
➔ Plug in dryer or reconnect power.
3. If F-24 or F-25 is not an error that is displayed in the diagnostic test mode, the
connections to the thermistor are good.
Therefore, check the thermistor’s resistance value, using the following process:
➔ Unplug dryer or disconnect power.
bulb thermometer in the exhaust outlet can
be 30°F (17°C) higher.
➔ Access the heater assembly. See
figure 2, page 6; and Removing the
Back Panel, page 12.
5. If the exhaust temperature is not within
specified limits, or you have come here
from step 3, remove the P4 connector,
then measure the resistance between
P4-3 (red wire) and P4-6 (red wire) at the
connector. See figure 15, page 11 for
connector location; and Accessing &
Removing the Electronic Assemblies,
page 11.
➔ Hold a glass bulb thermometer
capable of reading from 68° to 176°F
(20° to 80°C) in the heater assembly.
➔ Check the resistance of the inlet
thermistor. See figure 9, page 8 for
location.
➔ If the resistance is OK, check P4-3 and
P4-6 to machine ground.
INLET THERMISTOR RESISTANCE
RES.
RANGE
kΩ
RES.
RANGE
kΩ
➔ If resistance is greater than 0 (zero),
replace wiring harness.
TEMP.
°F (°C)
NOTE: All thermistor resistance
measurements must be made while dryer
is disconnected from power.
68° (20°) 61.2–63.7 131° (55°) 14.6–15.3
The following table gives temperatures
and ranges for the associated thermistor
resistance values.
86° (30°) 39.5–41.1 149° (65°) 10.2–10.7
77° (25°) 49.0–51.0 140° (60°) 12.1–12.8
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
TEMP.
°F (°C)
95° (35°) 32.0–33.3 158° (70°)
8.5–9.0
104° (40°) 26.1–27.2 167° (75°)
7.2–7.6
113° (45°) 21.4–22.3 176° (80°)
6.1–6.5
122° (50°) 17.6–18.5
The table above shows the resistance
values that should be observed for the
various temperatures at the heater
assembly.
➔ If the thermistor resistance does not
agree with table, replace the exhaust
thermistor.
➔ If the thermistor resistance does not
agree with the measurements in the
table, replace the inlet thermistor/ high
limit thermostat assembly.
➔ If the thermistor resistance checks
agree with the measurements in the
table, replace the machine control
electronics.
➔ If the thermistor resistance agrees with
the measurements in the table, replace
the machine control electronics.
INLET THERMISTOR
The machine control electronics monitors the
inlet temperature using an inlet thermistor
that is part of the high limit thermostat
assembly.
1. Activate the diagnostic test mode. See
procedure on page 1.
2. If F-24 or F-25 is a displayed error in the
diagnostic test mode, the thermistor or
wire harness is either open or shorted.
➔ Unplug dryer or disconnect power.
TEST #4b Thermal Fuse
The thermal fuse is wired in series with the
dryer drive motor.
1. Unplug dryer or disconnect power.
2. Access the thermal fuse by first removing
the back panel. See Removing the Back
Panel, page 12; and for thermal fuse
location see figure 9, page 8.
3. Using an ohmmeter, check the continuity
across the thermal fuse.
➔ Check wire connections at the
machine control electronics and inlet
thermistor. See Accessing & Removing
the Electronics Assemblies, page 11,
and for inlet thermistor location see
figure 9, page 8.
FOR SERVICE TECHNICIAN’S USE ONLY
➔ If the ohmmeter indicates an open
circuit, replace the failed thermal fuse.
TEST #4c Thermal Cut-Off
If the dryer does not produce heat, check the
status of the thermal cut-off.
1. Unplug dryer or disconnect power.
2. Access the thermal cut-off by first
removing the back panel. See Removing
the Back Panel, page 12.
3. Using an ohmmeter, check the continuity
across the thermal cut-off. See figure 9,
page 8, for location.
➔ If the ohmmeter indicates an open
circuit, replace the failed thermal
cut-off and inlet thermistor/high limit
thermostat. In addition, check for
blocked or improper exhaust system,
or failed heat element.
TEST #5 Moisture Sensor
NOTE: This test is started with the machine
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
1. Activate the diagnostic test mode and
advance past saved fault codes. See
procedure on page 1.
2. Open the dryer door. If a continuous
beep tone is heard and an alphanumeric
number is displayed on the console as
soon as the door is opened, a short
circuit exists in the moisture sensor
system.
➔ If this doesn’t happen, go to step 3.
➔ Otherwise, go to step 4.
NOTE: Over drying may be caused by a
short circuit in the sensor system.
3. Locate the two metal sensor strips on the
inside of the dryer. Bridge these strips
with a wet cloth or finger.
➔ If a continuous beep tone is heard and
a software revision number is
displayed on the console, the sensor
passes the test. Go to step 8.
➔ If not, continue with step 4.
4. Access the moisture sensor wires:
➔ Remove the back panel. See
Removing the Back Panel, page 12.
➔ Remove the lint screen.
➔ Remove the two screws holding the lint
screen duct to the top.
➔ Remove four screws from bottom of
the duct in rear. See figure 9, page 8.
➔ Remove the duct from the dryer to
access the moisture sensor.
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 10
➔ Disconnect the sensor connector. See
figure 10.
✔ No beep sound is heard
✔ Some buttons do not light indicators
None of the indicators light up:
Sensor Harness
with MOVs
Sensor
(Metal Oxide
Connector
Varistors)
1. See Diagnostic Guide/Before Servicing...
on page 1.
2. Perform TEST #1, page 6 to verify supply
connections.
3. Perform TEST #2, page 6.
Sensor
Blower
Housing
4. Perform steps in Accessing & Removing
the Electronic Assemblies, page 11 and
visually check that the P5 connector is
inserted all the way into the machine
control electronics.
5. Visually check the user interface
assembly connections.
6. If both visual checks pass, replace the
user interface assembly.
7. Plug in dryer or reconnect power.
Figure 10. Disconnect sensor
connector.
5. Access the machine control electronics.
See Accessing & Removing the
Electronic Assemblies, page 11. Remove
the connector P13 from the circuit board.
Check the main harness connections
between the sensor connector and
machine control for a short or open
circuit.
8. Perform the Console Buttons and
Indicators Diagnostic test, page 1 to
verify repair.
9. If indicators still do not light, the machine
control electronics has failed:
➔ Otherwise go to step 7.
7. 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
with MOVs.
TEST #6 Buttons and
Indicators
This test is performed when any of the
following situations occurs during the
Console Buttons and Indicators Diagnostic
Test, page 1:
If any of these conditions are not met:
➔ Unplug dryer or disconnect power.
➔ Check that the wires between the door
switch and machine control electronics
are connected. See figure 11 for switch
location and see Removing the Front
Panel/Drum Assembly, page 11.
➔ If the connections are OK, replace the
door switch assembly and retest.
➔ If the door switch assembly has been
replaced and dryer still does not start,
replace the machine control
electronics.
➔ Plug in dryer or reconnect power.
➔ Perform the Console Buttons and
Indicators Diagnostic test, page 1 to
verify repair.
Door Switch
No beep sound is heard:
1. Perform steps in Accessing & Removing
the Electronic Assemblies, page 11 and
visually check that the P5 connector is
inserted all the way into the machine
control electronics.
Figure 11. Door switch location.
➔ If visual check passes, replace the user
interface assembly.
2. Plug in dryer or reconnect power.
3. Perform the Console Buttons and
Indicators Diagnostic test, page 1 to
verify repair.
4. If replacing the user interface assembly
failed:
➔ Unplug dryer or disconnect power.
➔ Replace the machine control
electronics.
8. If moisture sensor diagnostic test passes,
check the thermistor: Perform TEST #4a,
page 8.
➔ If the problem persists after replacing
the moisture sensor, harness with
MOVs and thermistor, replace the
machine control electronics.
Activate the diagnostic test mode as shown
on page 1, and perform the Door Switch
Diagnostic test, page 1. Functionality is
verified with a beep each time the door is
closed and opened, and a number and letter
appears in the display (i.e., 0E, 09).
➔ Replace the machine control
electronics.
➔ If harness is OK, continue with step 6.
➔ If a small resistance is measured,
check for debris across moisture strips
inside of the drum; clean if debris is
present. If debris is not present,
replace sensor harness with MOVs.
TEST #7 Door Switch
➔ Unplug dryer or disconnect power.
➔ Replace the main harness if necessary.
6. Measure the resistance
across the outermost
contacts of the sensor
connector that includes the two MOVs.
3. Perform the Console Buttons and
Indicators Diagnostics test, page 1 to
verify repair.
➔ Plug in dryer or reconnect power.
➔ Perform the Console Buttons and
Indicators Diagnostic test, page 1
to verify repair.
Some buttons do not light indicators:
1. Perform steps in Accessing & Removing
the Electronic Assemblies, page 11 and
visually check the user interface
assembly connections.
➔ If visual check passes, replace the user
interface assembly.
2. Plug in dryer or reconnect power.
✔ None of the indicators light up
FOR SERVICE TECHNICIAN’S USE ONLY
ADJUSTING CUSTOMERFOCUSED DRYING MODES
NOTE: If the customer is complaining about
the clothes being damp and the moisture
sensor passes TEST #5, page 9, step 3, the
total dry time for an automatic cycle can be
lengthened by changing from a “1” (standard
auto cycle) to a “2” (15% more drying time)
or “3” (20% more drying time) auto cycle.
1. Press and hold the Dryness button for 5
seconds. The dryer will beep and display
CF for one second, then the current
drying mode will be seen on the display.
The factory default value is “1”.
2. To select a different drying mode, press
the Dryness button again. The dryer
display will flash and show the available
settings.
3. With the display flashing the selected
drying mode, press the Start button to
save the drying mode and exit (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.
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 11
4. Press the Pause/Cancel button at any
time to cancel changes and exit from this
mode.
10. Lower components can be accessed at
this time, however, if the drum is to be
removed, the belt must be removed. See
TEST #3, step 5, page 7.
REMOVING THE FRONT
PANEL/DRUM ASSEMBLY
Reinstalling the Front Panel/Drum
Assembly
1. Unplug dryer or disconnect power.
Refer to preceding removal sections and
replace in reverse order.
2. Remove the lint screen.
3. Remove the two screws holding the lint
screen duct to the top.
4. Open the door.
5. Push on the retaining clips located under
top of dryer on the right and left side
using a flat object such as a putty knife.
See figure 12.
Front Cover Screw
(Inside Cabinet)
ACCESSING & REMOVING
THE ELECTRONIC
ASSEMBLIES
There are two electronic assemblies; the
machine control electronics and the user
interface electronics. See figures 14 and 15.
Door Switch
Wire Harness
Connector
Back Cover Locking Tabs
3 Screws
1. Unplug dryer or disconnect power.
2. Remove two screws from the rear of the
console assembly. Pull console towards
front of dryer to hinge open and/or
remove console.
Removing the Machine Control
Electronics
3. Remove the wire connections to the
machine control assembly.
4. Remove the one screw holding the
machine control assembly to the
metal bracket. See figure 14.
5. Push in on the tab located on the back
of the machine control to slide it off
the bracket.
Removing the User Interface
Assembly
3. Remove the wire connections from the
user interface assembly, including the
P5 ribbon cable. See figure 14.
4. Remove the cycle selector knob from
the front of the console by firmly
pulling on it or carefully prying straight
upward.
P5
Ribbon
Cable
Top Clips
Figure 12. Slowly rotate top backwards
and support.
6. Slowly rotate top backwards and lean
against wall, or support with a prop rod.
7. Disconnect the door switch wire harness
located on the right side. See figure 12.
Screw
Metal Bracket
User Interface
Assembly Back Cover
Machine Control
Electronics
Assembly
5. The user interface assembly is held to
the console insert panel by three
screws and two locking tabs. After the
screws are removed, lift each of the
locking tabs to remove the back cover
of the user interface assembly. See
figure 14.
6. Remove the cycle selector switch from
the user interface assembly opening
by lifting the locking tab on the cycle
selector switch and turning the
selector switch in a counterclockwise
direction. See figure 16, page 12.
Figure 14. Locate the electronic
assemblies.
8. Remove the front panel/door assembly
by removing the two front cover screws at
the top of the panel inside the cabinet,
and lifting upward.
9. Remove the front bulkhead by loosening
the upper two screws and removing the
lower two screws. See figure 13.
Drum Face
Plate
N.O. Heater COM
Black Relay 1 Red
Lint Screen
Duct
Blue
Black
Motor
Relay
Yellow-Red
P9
1
1
1
P13 P3
P5 8
1
P2
P/N XXXXXX Rev X
Date CodeYDDD-xx
XXXX-XXX
MADE IN COO
5
1
P8
3
P14 1
Black-White
Tan
White
Green-Yellow
Brown
3
6
1
P4
1
Heater Relay 2
N.O. COM
Black Violet (Dual Element Model Only)
Figure 13. Remove the front bulkhead.
Figure 15. Machine control electronics.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10054150
TECH SHEET - DO NOT DISCARD
PAGE 12
REMOVING THE BACK PANEL
Cycle Selector
Switch
1. Unplug dryer or disconnect power.
2. Remove the cover plate screw and cover
plate. See figure 17.
3. Remove the nine rear screws from the
back panel, then remove panel.
Locking
Tabs
Cover Plate Screw
Cover Plate
User Interface
Assembly
Figure 16. Gently apply pressure to
locking tabs to release the user interface
assembly.
7. Locking tabs located at the bottom of
the console insert panel secure the
user interface assembly to the console
insert panel. Using a flat-blade
screwdriver, gently apply pressure to
the locking tabs to release the user
interface assembly. See figure 16.
Reinstalling the Electronic
Assemblies
Refer to preceding removal sections and
replace in reverse order.
Figure 17. Remove screws.
NOTE: When replacing the cycle selector
switch, make sure that the shaft is positioned
through the center of the shaft seal that is
captive between the decorative overlay and
the console panel insert.
NOTE: When reconnecting wire
connections, be sure to route the user
interface wires beneath the retainer clips on
the user interface back cover.
SOFTWARE COPYRIGHTED.
MANUFACTURED UNDER ONE OR MORE
OF THE FOLLOWING U.S. PATENTS:
4,669,200
4,700,495
4,754,556
4,840,285
4,865,366
4,899,464
4,908,959
04/06
FOR SERVICE TECHNICIAN’S USE ONLY
4,989,347
5,066,050
5,560,120
5,809,828
6,020,698
6,047,486
6,199,300
6,446,357
6,597,144
6,604,298
6,685,241
6,732,447
6,784,673
6,819,255
D314,261
D314,262
D457,991
D457,992
D495,453
PART NO. W10054150