Whirlpool WED7400XW0 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.
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.
PAGE 1
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 Power button twice.
➔ 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 4.
➔ If no indicators come on after pressing the Power button, go to TEST #1,
page 4.
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.
■ 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.
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 8.
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.
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 Done indicator on).
2. Select any one button (except Power) and follow the steps below, using the
same button (remember the button):
Release for
Press/hold
Release for
Press/hold
Press/hold
➔
➔
➔
➔
2-5 seconds 2-5 seconds 2-5 seconds 2-5 seconds 2-5 seconds
FOR SERVICE TECHNICIAN’S USE ONLY
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 8.
DIAGNOSTIC: Moisture Sensor
1. Open the door and locate two metal strips on the face of the lint screen
housing. Using a wet cloth or one finger, jointly touch both strips.
➔ If a continuous beep tone is heard and an alphanumeric number is
displayed on the console, the sensor is OK.
➔ If a continuous beep tone is not heard, or if a continuous beep tone is heard
before touching both moisture strips, go to step 2.
2. Check to see if there is water in the dryer around the moisture strips.
➔ If no water is present, go to TEST#5, page 7.
➔ If water is present, wipe the strips off with a dry cloth and repeat step 1.
➔ If wiping the strips does not stop the beeping, run a timed dry cycle for 2
minutes to dry out the drum, then repeat this diagnostic test.
DIAGNOSTIC: Motor, Heater, and Console ID
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: c9, ca, cb, cc.
➔ If none of the Console IDs listed above are displayed, replace the user
interface assembly. See Accessing & Removing the Electronic Assemblies,
page 9.
➔ If the motor does not turn on, go to TEST #3, page 4.
➔ If no heat is detected, go to TEST #4, page 6.
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 2
Drum Light
button controls
its own indicator.
Power button controls “Sensing”
and “Done” indicators.
Rotating the knob turns indicators
on or off.
Figure 1. Console Diagnostics.
“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 Level
button controls
all indicators
above button.
Start button
turns on the
dryer.
Temp button
controls all
indicators
above button.
Wrinkle Shield
button controls
its own
indicator.
Cycle Signal
button controls
the Eco Monitor
LEDs.
Damp Dry Signal
button controls
all indicators
above button.
DIAGNOSTIC: Displaying Inlet Air Flow
ACTIVATING THE MANUAL LOAD TEST
Used to display the air flow value at the inlet of the heater box being measured by
the machine control.
1. Be sure the dryer is in standby mode (plugged in with all indicators off, or with
only the Done indicator on).
After all saved fault codes have been displayed, press the Wrinkle Shield button
to activate air flow detection. A 30 or 50 second countdown timer will start and the
dryer will turn on.
2. Select any one button (except Power) and follow the steps below, using the
same button (remember the button):
➔ 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 air flow 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 Level modifier LED will also be illuminated to indicate the air flow
range corresponding to the number displayed.
■ The More LED will be illuminated for air flow readings above 40 cfm.
■ The Normal LED will be illuminated for air flow readings between 29 and 40 cfm.
■ The Less LED will be illuminated for air flow readings less than 29 cfm.
➔ If air flow value is low, check to make sure the lint screen is clean, the door
seal is in place, and the vent is not obstructed.
DIAGNOSTIC: Displaying Line Voltage
Used to display the line voltage currently being measured by the machine control:
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 Level modifier LED will also be illuminated to indicate the voltage range
corresponding to the number displayed. The Dryness Level LEDs relate to specific
voltage ranges as follows:
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.
Now press any key (except Power) and the control will advance through each step
of the following sequence:
Non Steam Model
2. Motor + heater.
3. No loads on (motor + heater).
4. Repeat using same button.
➔ Flash “Casual” LED.
➔ Flash “Normal” LED.
➔ Start sequence again at 1.
Steam Model
2. Motor + heater + water valve.
Motor + heater + water valve +
3.
drum light.
No loads on (motor + heater +
4.
water valve).
5. Repeat using same button.
➔ Flash “Delicate” LED.
➔ Flash “Drum Light” LED.
➔ Flash “Normal” LED.
➔ Start sequence again at 1.
■ The More LED will be illuminated for high voltage readings (above 260 VAC).
DEACTIVATING THE MANUAL LOAD TEST
■ The Normal LED will be illuminated for normal voltage readings (200-260 VAC).
Press the Power button to exit this mode.
■ 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 L 2.
Go to TEST #1, page 4.
DEACTIVATING THE DIAGNOSTIC TEST MODE
Press the Power button twice to exit diagnostics.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 3
DISPLAY FAULT CODES
TROUBLESHOOTING GUIDE
The fault codes below would be indicated when attempting to start a drying cycle
or after activating the diagnostic test mode.
Some tests will require accessing components. See figure 2, page 4 for component
locations.
DISPLAY
DESCRIPTION
EXPLANATION / RECOMMENDED PROCEDURE
PF
Power
Failure
PF flashes to indicate that a power failure
occurred while the dryer was running. Press Start
to continue the cycle, or press Power to clear the
display.
L2
Low/No Line
Voltage
L2 flashes if low line voltage (less than 50V) is
detected at installation.
■ Check to see if a household fuse has blown or
a circuit breaker has tripped.
■ Confirm the power cord is properly installed
and plugged into the power outlet.
■ Check the relay connections on the machine
control electronics. See TEST #4, page 6.
AF
Restricted
Air Flow
Condition
AF flashes if a restricted air flow 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
Primary
Control
Failure
F:01 flashes when there is a primary control
failure. Replace the machine control electronics.
See Accessing & Removing the Electronic
Assemblies, page 9.
F :02
Keypad/
User Interface
Failure
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 8.
F :22
Exhaust
Thermistor
Open
F:22 flashes if the exhaust thermistor is open.
See TEST #4a, page 6.
F :23
Exhaust
Thermistor
Shorted
F:23 flashes if the exhaust thermistor has
shorted. See TEST #4a, page 6.
F :24
Inlet
Thermistor
Open
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 6.
F :25
Inlet
Thermistor
Shorted
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 6.
F :26
PROBLEM
POSSIBLE CAUSE / TEST
NOTE: Possible Cause/Tests MUST be performed
in the sequence shown for each problem.
WON’T POWER UP.
(No response when
buttons are pressed.)
1. Supply connections. See TEST #1, page 4.
2. Unplug dryer or disconnect power. Check harness
connections.
3. User interface assembly. See TEST #6, page 8.
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 4.
See TEST #7, page 8.
WON’T SHUT OFF
WHEN EXPECTED.
1. Check Power button. See TEST #6, page 8.
2. User interface assembly. See TEST #6, page 8.
3. Moisture sensor. See TEST #5, page 7.
CONTROL WON’T
ACCEPT SELECTIONS.
User interface assembly. See TEST #6, page 8.
WON’T HEAT.
HEATS IN AIR CYCLE.
SHUTS OFF BEFORE
CLOTHES ARE DRY.
1. Heater. See TEST #4, page 6.
2. Unplug dryer or disconnect power. Check harness
connections.
3. Check installation.
Heater. See TEST #4, page 6.
1.
2.
3.
4.
5.
Check the dryness setting for auto cycles.
Check for full lint screen.
Check for clogged vent.
Moisture sensor. See TEST #5, page 7.
Dryness adjust. See Adjusting Customer-Focused
Drying Modes, page 8.
Motor Drive
F:26 flashes if there is a motor drive system
System Failure failure. See TEST #3, page 4.
F :28
Moisture
Sensor Open
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 7.
F :29
Moisture
Sensor
Shorted
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 7.
F :30
Restricted
Air Flow
Condition
F:30 flashes if a restricted air flow 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.
F :50
Water Valve
Failure
F:50 flashes if no voltage is detected at the water
valve relay. Check that the wires are plugged in on
the valve and at the relay on the machine control
electronics. See TEST #8, page 8. This fault code
appears ONLY when in the diagnostic test mode.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 4
See Accessing & Removing the Electronic Assemblies,
page 9, to access:
Terminal Block
Power Cord
Plug
L1
N
■ Machine Control Electronics
■ User Interface Assembly
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.
COM
See Removing the
Back Panel, page 10,
to access:
Figure 4. Plug-to-terminal connections.
■ Drum Light Assy.
Door
Switch
Moisture
Sensor
Strips
➔ If there is no continuity, replace the power cord
and test the dryer.
■ Water Nozzle
(Steam Model)
■ Water Valve Assy.
(Steam Model)
■ Drive Motor
■ Belt Switch
➔ 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
above and the appropriate wiring diagram. See
pages 11 and 12.
Heater
Assembly
➔ When this is found, go to step 6.
See Removing the Front Panel/Drum Assembly,
page 9, to access:
■ Moisture Sensors
■ Heater Assembly
■ Exhaust Thermistor
■ Thermal Fuse
■ Thermal Cut-off
■ Inlet Thermistor/
High Limit Thermostat
Figure 2. Component locations.
TROUBLESHOOTING TESTS
NOTE: These checks are done with the dryer
unplugged or disconnected from power.
➔ 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.
1. Unplug dryer or disconnect power.
➔ 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, at left.
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.
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 16, page 9.
2. Access the machine control electronics and
measure the resistance across P8-4 and P9-1.
See Accessing & Removing the Electronic
Assemblies, page 9.
➔ 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.
2. Remove the cover plate from the back of the
dryer. See figure 3.
Cover
Plate
➔ If the drum light illuminates, then power is
present at the machine control. Go to
TEST #6, page 8.
6. Access the machine control electronics without
disconnecting any wiring to the control board.
See Accessing & Removing the Electronic
Assemblies, page 9.
TEST #1 Supply Connections
This test should only be done after confirming proper
voltage at the outlet.
2. Open the door.
➔ 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.
Remove Screw
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. If both visual checks pass, replace the user
interface assembly.
12. Replace all parts and panels.
➔ 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. See pages 11
and 12.
4. Perform TEST #4b, page 7. If thermal fuse is OK,
continue with step 5.
5. 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 10.
Slowly remove the drum belt from the
spring-loaded belt switch tension pulley, gently
letting the pulley down. See figure 5.
Tension
Pulley
Drum
Belt
13. Plug in dryer or reconnect power.
Figure 3. Remove the cover plate.
3. Make sure the power cord is securely fastened
to the terminal block.
14. Perform the Console Buttons and Indicators
Diagnostic test, page 1, to verify repair.
15. If indicators still do not light, the machine control
electronics has failed:
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.
➔ Unplug dryer or disconnect power.
➔ Replace the machine control electronics.
➔ Replace all parts and panels.
➔ Plug in dryer or reconnect power.
Figure 5. Slowly remove drum belt.
➔ Perform the Console Buttons and Indicators
Diagnostic test, page 1 to verify repair.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 5
➔ 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.
6. Remove the white connector from the drive motor
switch. See figure 6.
Drive Motor
Switch
White
Connector
➔ If the Start winding resistance is much greater
than 3 Ω, replace the motor.
2 6
4 3
9. 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.
5
1
Blue Wires
(Back and 4 Position)
Belt Switch
Tension Pulley
2 6
4 3
Figure 6. Remove white connector.
5
Drive Motor
Switch
1
7. Remove the bare copper wire terminal from pin 5
of black drive motor switch. See figure 7.
Belt Switch
Main Winding:
Blue Wire in Back and
Bare Copper Wire
(5 position)
Figure 8. Checking the belt switch.
2 6
4 3
➔ 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.
5
➔ If belt switch is OK and there is still an open
circuit, check and repair the wiring harness.
1
Start Winding:
Blue Wire in Back
and Bare Copper Wire
(3 position)
Figure 7. Main and Start winding measure
points.
10. Door switch problems can be uncovered by
following procedure under DIAGNOSTIC: Door
Switch, 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).
8. 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
➔ With the door properly closed, the ohmmeter
should indicate a closed circuit (0–2 Ω).
➔ If not, replace the door switch assembly. See
figure 11, page 8; and Removing the Front
Panel/Drum Assembly, page 9.
CONTACT POINTS OF
MEASUREMENT
1.4–2.6
Blue wire in back at
pin 4 and bare copper
wire terminal removed
from pin 5 of black
drive motor switch
1.4–2.8
Blue wire in back at
pin 4 and bare copper
wire terminal on
pin 3 of black
drive motor switch
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
TEST #4 Heater
This test is performed when one of the following
situations occur:
PAGE 6
5. Measure the resistance between the red wires
at the heater.
➔ If an open circuit is not detected, go to
step 7.
✔ Dryer does not heat
➔ If an open circuit is detected, go to step 6.
✔ Heat will not shut off
✔ Display flashes L2
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
6. Visually check the wire connections to the heater.
If the connections look good, replace the heater
assembly.
7. Visually check connections at the machine control
electronics. If the connections look good, and an
open circuit was not previously detected at the
heater, remove the P4 connector, then measure
the resistance between P4-3 (red wire) and P4-6
(red wire) at the connector. See figure 16, page 9
for connector location; and Accessing &
Removing the Electronic Assemblies, page 9.
➔ If 5–15 kΩ are measured, replace the machine
control electronics.
Dryer does not heat or display flashes L2:
Locate the components using figure 2, page 4; and
figure 9, below.
Thermal Cut-Off
Inlet Thermistor/
High Limit
Thermostat
Exhaust
Thermistor
➔ If the resistance is less than 1 kΩ, replace the
exhaust thermistor.
Heat will not shut off:
1. Unplug dryer or disconnect power.
2. Access the machine control electronics.
See Accessing & Removing the Electronic
Assemblies, page 9. Remove the P4 connector.
See figure 16, page 9 for connector location; then
measure the resistance between P4-3 (red wire)
and P4-6 (red wire) at the connector.
➔ If 5–15 kΩ are measured, replace the machine
control electronics.
➔ If the resistance is greater than 20 kΩ, replace
the exhaust thermistor.
Heater
Element
Thermal Fuse
Figure 9. Thermal components, viewed from
front.
1. Unplug dryer or disconnect power.
2. Remove the front panel and drum assembly to
access the thermal components. See Removing
the Front Panel/Drum Assembly, page 9.
3. Using an ohmmeter and referring to the
appropriate wiring diagram (see pages 11 and
12), measure the resistance across the high limit
thermostat.
➔ If wire connections are OK, check the exhaust
thermistor resistance per step 5.
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:
EXHAUST TEMPERATURES
TEMPERATURE HEAT TURNS OFF* HEAT TURNS ON
SETTING
°F (°C)
°F (°C)
High
Medium
Low
Extra Low
155°±5° (68°±3°)
10°–15° (6°–8°)
below the
125°±5° (52°±3°) heat turn off
temperature
140°±5° (60°±3°)
105°±5° (41°±3°)
* The measured overshoot using the glass bulb
thermometer in the exhaust outlet can be 30°F
(17°C) higher.
5. If the exhaust temperature is not within specified
limits, or you have come here from step 3, unplug
dryer or disconnect power. Remove the P4
connector, then measure the resistance between
P4-3 (red wire) and P4-6 (red wire) at the
connector. See figure 16, page 9 for connector
location; and Accessing & Removing the Electronic
Assemblies, page 9.
➔ If the resistance is OK, check P4-3 and P4-6
to machine ground.
TEST #4a Thermistors
➔ If resistance is greater than 0 (zero), replace
wiring harness.
EXHAUST THERMISTOR
NOTE: All thermistor resistance measurements
must be made while dryer is disconnected from
power.
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.
➔ If an open circuit is not detected, 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 and the high limit thermostat.
If connections look good, check for continuity
across each of these components. Replace both
the thermal cut-off and the inlet thermistor/high
limit thermostat assembly if either the thermal
cut-off or the high limit thermostat is electrically
open.
➔ Unplug dryer or disconnect power.
➔ Check wire connections at the machine control
electronics and thermistor. See Accessing &
Removing the Electronic Assemblies, page 9;
and for thermistor location, figure 9.
The following table gives temperatures and ranges
for the associated thermistor resistance values.
EXHAUST THERMISTOR RESISTANCE
TEMP.
°F (°C)
50° (10°)
60° (16°)
70° (21°)
RES.
kΩ
TEMP.
°F (°C)
19.0–22.0 80° (27°)
14.8–16.8 90° (32°)
11.5–13.5 100° (38°)
RES.
kΩ
8.5–10.5
6.8–8.8
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.
INLET THERMISTOR
The machine control electronics monitors the inlet
temperature using an inlet thermistor that is part of
the inlet thermistor/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.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
➔ Unplug dryer or disconnect power.
➔ Check wire connections at the machine control
electronics and inlet thermistor. See Accessing
& Removing the Electronics Assemblies,
page 9, and for inlet thermistor location, see
figure 9, page 6.
➔ If wire connections are good, remove the wires
from the inlet thermistor/high limit thermostat
assembly and replace the assembly.
➔ Replace all parts and panels.
➔ Plug in dryer or reconnect power.
PAGE 7
TEST #4c Thermal Cut-Off
If the dryer does not produce heat, check the status
of the thermal cut-off.
➔ Unplug dryer or disconnect power.
➔ 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 6 for location.
INLET THERMISTOR RESISTANCE
TEMP.
°F (°C)
RES.
kΩ
TEMP.
°F (°C)
RES.
kΩ
68° (20°) 61.2–63.7 131° (55°) 14.6–15.3
77° (25°) 49.0–51.0 140° (60°) 12.1–12.8
86° (30°) 39.5–41.1 149° (65°) 10.2–10.7
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
2. Access the thermal cut-off by first removing the front
panel and drum assembly. See Removing the Front
Panel/Drum Assembly, page 9.
3. Using an ohmmeter, check the continuity across
the thermal cut-off. See figure 9, page 6, for
location.
➔ If the ohmmeter indicates an open circuit,
replace the failed thermal cut-off and inlet
thermistor/high limit thermostat assembly.
In addition, check for blocked or improper
exhaust system, or failed heat element.
➔ If the thermistor resistance does not agree with
the measurements in the table, replace the inlet
thermistor/high limit thermostat assembly.
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. 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: Overdrying may be caused by a short
circuit in the sensor system.
3. Locate the two metal sensor strips on the face of
the lint screen housing. Using a wet cloth or one
finger, jointly touch both strips.
➔ 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 the thermistor resistance agrees with the
measurements in the table, replace the
machine control electronics.
➔ If a beep tone is not heard, or a continuous
beep tone is heard before touching both
moisture strips, continue with step 4.
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
front panel. See Removing the Front Panel/Drum
Assembly, page 9; and for thermal fuse location,
see figure 9, page 6.
Sensor
Connector
Lint Screen
Housing
TEST #5 Moisture Sensor
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.
Sensor Harness
with MOVs
(Metal Oxide
Varistors)
1. Unplug dryer or disconnect 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:
➔ Access the heater assembly. See figure 2,
page 4; and Removing the Front Panel/Drum
Assembly, page 9.
Sensor
4. Unplug dryer or disconnect power. Access the
moisture sensor wires by removing the front panel.
See Removing the Front Panel/Drum Assembly,
page 9. Disconnect the sensor connector. See
figure 10.
Figure 10. Disconnect sensor connector.
5. Access the machine control electronics.
See Accessing & Removing the Electronic
Assemblies, page 9. 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.
➔ Replace the main harness if necessary.
➔ If harness is OK, continue with step 6.
6. Measure the resistance across
the outermost contacts of the
sensor connector that includes
the two MOVs.
➔ 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 the sensor harness
with MOVs.
➔ If a small resistance is not measured, continue
with 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.
8. If moisture sensor diagnostic test passes, check
the thermistor: Perform TEST #4a, page 6.
➔ If the problem persists after replacing the
moisture sensor harness with MOVs and the
thermistor, replace the machine control
electronics.
3. Using an ohmmeter, check the continuity across
the thermal fuse.
➔ If the ohmmeter indicates an open circuit,
replace the failed thermal fuse.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 8
TEST #6 Buttons and Indicators
TEST #7 Door Switch
This test is performed when any of the following
situations occurs during the Console Buttons and
Indicators Diagnostic Test, page 1:
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 an alphanumeric
number appears in the display (i.e., 0E, 09, etc.).
✔ None of the indicators light up
✔ No beep sound is heard
✔ 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 TEST #2, page 4.
4. Perform steps in Accessing & Removing the
Electronic Assemblies, page 9 and visually check
that the P5 connector is inserted all the way into
the machine control electronics.
5. Visually check that the user interface assembly
is properly inserted into the front console.
6. If both visual checks pass, replace the user
interface assembly.
7. Replace all parts and panels.
8. Plug in dryer or reconnect power.
9. Perform the Console Buttons and Indicators
Diagnostic test, page 1 to verify repair.
10. If indicators still do not light, the machine control
electronics has failed:
➔ Unplug dryer or disconnect power.
➔ Replace the machine control electronics.
➔ Replace all parts and panels.
➔ Plug in dryer or reconnect power.
➔ Perform the Console Buttons and Indicators
Diagnostic test, page 1 to verify repair.
No beep sound is heard:
1. Perform steps in Accessing & Removing the
Electronic Assemblies, page 9 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 assembly.
2. Replace all parts and panels.
3. Plug in dryer or reconnect power.
4. Perform the Console Buttons and Indicators
Diagnostic test, page 1 to verify repair.
5. If replacing the user interface assembly failed:
➔ Unplug dryer or disconnect power.
➔ Replace the machine control electronics.
➔ Replace all parts and panels.
➔ Plug in dryer or reconnect power.
➔ Perform the Console Buttons and Indicators
Diagnostic test, page 1 to verify repair.
➔ Unplug or disconnect dryer.
➔ Replace the machine control electronics
as shown in “Accessing & Removing the
Electronic Assemblies”, page 9.
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 9.
➔ 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.
Water Nozzle
Door Switch
Water Valve Assembly
Figure 12. Water Valve
ADJUSTING CUSTOMER-FOCUSED
DRYING MODES
Figure 11. Door switch location.
TEST #8 Water Valve (Steam Model)
Activate the Diagnostics Test Mode as shown in
Activating the Diagnostics Test Mode, page 1. Press
Start and verify that water is being sprayed in the
drum.
If no water is sprayed in the drum:
1. Check that the water is hooked up and turned on.
2. Unplug dryer or disconnect power.
3. Perform steps in Accessing & Removing the
Electronic Assemblies, page 9, and check that the
wires are connected to the water valve relay on
the machine control electronics.
4. Inside the drum, unscrew and replace the water
nozzle using a 7/16" wrench or socket.
5. Remove the back panel as shown in Removing
the Back Panel, page 10, then:
➔ Check that the wires and hose are connected
to the water valve assembly. See figure 12.
NOTE: If the customer is complaining about the
clothes being damp and the moisture sensor passes
TEST #5, page 7, step 3, the total dry time 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. With the dryer in standby mode, press and hold
the Dryness Level button for 5 seconds. The dryer
will beep and display cf for 1 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 Level 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.
4. Press the Power button at any time to cancel
changes and exit from this mode.
➔ Check that the water valve assembly hose is
connected to the nozzle.
Some buttons do not light indicators:
1. Perform steps in Accessing & Removing the
Electronic Assemblies, page 9 and visually check
the user interface assembly connections.
➔ If visual check passes, replace the user
interface assembly.
2. Replace all parts and panels.
3. Plug in dryer or reconnect power.
4. Perform the Console Buttons and Indicators
Diagnostics test, page 1 to verify repair.
9. If water is still not dispensed:
➔ If everything is hooked up, replace the
water valve assembly.
6. Replace the back panel.
7. Plug in dryer or reconnect power.
8. Activate the Diagnostic Test Mode as shown in
Activating the Diagnostic Test Mode, page 1.
Press Start and verify that water is being sprayed
in the drum.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
REMOVING THE FRONT PANEL/
DRUM ASSEMBLY
1. Unplug dryer or disconnect power.
PAGE 9
11. 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 4.
2. Open the door.
Reinstalling the Front Panel/Drum Assembly
3. 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 13.
Refer to preceding removal sections and replace in
reverse order.
Front Cover Screw
(Inside Cabinet)
Door Switch
Connector
NOTE: Make sure to reconnect the moisture sensor
wire connections.
ACCESSING & REMOVING THE
ELECTRONIC ASSEMBLIES
There are two electronic assemblies: the machine
control electronics and the user interface electronics.
See figures 15 and 16.
User Interface
Assembly
Back Cover
Top Clips
Figure 13. Slowly rotate top backward and
support.
Back Cover
Locking Tabs
Ribbon
Cable
6. 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 lint screen housing by removing the
four screws holding the lint screen housing. See
figure 14.
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 15.
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 15.
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 17, page 10.
Screw
Machine Control
Electronics
Assembly
Metal Bracket
Figure 15. Locate the electronic assemblies.
10. Remove the front bulkhead by loosening the
upper two screws and removing the lower two
screws. See figure 14.
Removing the Machine Control
Electronics
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 15.
5. Disconnect the door switch wire harness located
on the right side. See figure 13.
8. Remove the lint screen.
2. Remove two screws from the rear of the console
assembly. Pull console toward front of dryer to
hinge open and/or remove console.
4. Remove the cycle selector knob from the
front of the console by firmly pulling on it
or gently prying straight upward.
3 Screws
4. Slowly rotate top backward and lean against wall,
or support with a prop rod.
7. Disconnect the moisture sensor connections.
See figure 10, page 7.
1. Unplug dryer or disconnect power.
N.O. Heater COM
Black Relay 1 Red
Blue
Black
Motor
Relay
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 17,
page 10.
Yellow-Red
P9
1
1
1
P13 P3
P5 8
P2
XXXX-XXX
MADE IN COO
Date CodeYDDD-xx
P/N XXXXXX Rev X
5
1
P8
N.O.
Blue
Figure 14. Remove the front bulkhead.
COM
Red
Black-White
Tan
White
Green-Yellow
Brown
1
3
P14 1
3
6
1
P4
1
Steam Relay
(Steam Model)
Figure 16. Machine control electronics.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 10
Figure 17. Gently apply pressure to locking tabs
to release the user interface assembly.
Reinstalling the Electronic Assemblies
Refer to preceding removal sections and replace
in reverse order.
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.
REMOVING THE BACK PANEL
1. Unplug dryer or disconnect power.
2. Remove the cover plate screw and cover plate.
See figure 18.
3. Remove the nine rear screws from the back panel,
then remove panel.
Cover Plate Screw
Cover Plate
Figure 18. Remove screws.
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 11
ELECTRIC DRYER WIRING DIAGRAM
IMPORTANT: Electrostatic (static electricity) discharge may cause damage to
machine control electronics. See page 1 for details.
NON-STEAM MODEL
L1 LINE – BK
R – LINE L2
240 VOLTS
W – NEUTRAL N
120 VOLTS
BR P8-1
BK
BK
DRUM LAMP
USER INTERFACE
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
LAMP LOAD
NEUTRAL
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
P2-1 VDD
P2-2 DATA
P2-3 VSS
N.O.
BK
R
COM
HEATER
RELAY 1
DOOR
GND
MOTOR
MTR CS
MOIST.
MOIST RTN
MODEL
MODEL RTN
OUTLET TEMP.
OUTLET
TEMP RTN
INLET TEMP.
MACHINE
INLET
CONTROL
TEMP RTN
ELECTRONICS
P8-3 NEUTRAL
P8-4
T
P8-2
G-Y
BU
P8-5
BK-W
BU
NO
4M
SENSOR
MOVS
P13-2
G-Y
P4-4
P4-5
Y-R
W
R
W
DOOR
SWITCH
5M
Y-R
NEUTRAL
TERMINAL
LINKED TO
CABINET
W
THERMAL FUSE
Y-R
P13-1
NC
BU
P9-1
BELT
SWITCH
2M
CENTRIFUGAL SWITCH
MAIN
1.4–2.6 Ω
START
1.4–2.8 Ω
G-Y
3M
6M
1M
DRIVE MOTOR
1/3 H.P.
SENSOR
BK
P4-3
R
EXHAUST THERMISTOR
P4-6
R
10 kΩ
P4-2
R
INLET THERMISTOR
P4-1
R
50 kΩ
R
FOR SERVICE TECHNICIAN’S USE ONLY
W
NC
THERMAL
CUT-OFF
R
R-W
BK
HIGH LIMIT
THERMOSTAT
HEATER
PART NO. W10301482B
TECH SHEET - DO NOT DISCARD
PAGE 12
ELECTRIC DRYER WIRING DIAGRAM
IMPORTANT: Electrostatic (static electricity) discharge may cause damage to
machine control electronics. See page 1 for details.
STEAM MODEL
CENTRIFUGAL SWITCH (MOTOR)
Contacts
Function
PLUGGABLE DRIVE MOTOR SWITCH
Black-White
Blue
White
Green-Yellow
1M 2M 3M 5M 6M
Start
Red
Red
Run
= Contacts closed
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
03/10
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. W10301482B