PAGE 1
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
IMPORTANT SAFETY NOTICE — “For Technicians only”
This service data sheet is intended for use by persons having electrical, electronic, and
mechanical experience and knowledge at a level generally considered acceptable in the
appliance repair trade. Any attempt to repair a major appliance may result in personal injury
and property damage. The manufacturer or seller cannot be responsible, nor assume any
liability for injury or damage of any kind arising from the use of this data sheet.
Whirlpool, Maytag, and Kenmore Control Panels ... 2–4
Diagnostic Guide .................................................. 5
Activating the Service Diagnostic Mode ................ 5
Key Activation & Encoder Test .............................. 6
Service Test Mode ................................................ 6
Service Test Mode Chart .................................. 7, 8
Software Version Display ...................................... 9
Contents
Fault/Error Codes ........................................... 9, 10
Troubleshooting Guide ........................................ 11
Troubleshooting Tests................................... 12–23
Strip Circuits ...................................................... 24
Wiring Diagrams .......................................... 25, 26
Component Locations ........................................ 27
PART NO. W10680150D
IMPORTANT: Electrostatic Discharge (ESD) Sensitive Electronics
ESD problems are present everywhere. Most people begin to feel an ESD discharge at
approximately 3000V. It takes as little as 10V to destroy, damage, or weaken the main control
assembly. The new main control assembly may appear to work well after repair is finished,
but a malfunction 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
-OR-
Touch 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 electronic control assembly
by edges only.
When repackaging main control assembly in anti-static bag, observe above instructions.
Voltage Measurement Safety Information
When performing live voltage measurements, you must do the following:
Verify the controls are in the off position so that the appliance does not start when energized.
Allow enough space to perform the voltage measurements without obstructions.
Keep other people a safe distance away from the appliance to prevent potential injury.
Always use the proper testing equipment.
After voltage measurements, always disconnect power before servicing.
PAGE 2
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
WHIRLPOOL CONTROL PANEL (features and appearances may vary between models)
POWER button: press once to turn off
indicator. Press twice to exit service
diagnostic mode and return to
standby mode.
START/PAUSE button:
press once to turn
off indicator.
Option buttons: press each
button once to turn off
its respective indicator.
Figure 1a - Key Activation & Encoder Test for Service Diagnostic Mode, Whirlpool Models
Press each modifier button
once to turn off its respective
display segment.
Timed Dry Adjust “–” or “+”
button: press once to turn off
its respective indicator.
Option buttons: press each
button once to turn off
its respective indicator.
Pressing each “WHAT TO DRY”
button turns off each
corresponding indicator.
Pressing each “HOW TO DRY”
button turns off each corresponding
indicator. Pressing “Normal” also turns
off the seven-segment display.
PAGE 3
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
MAYTAG CONTROL PANEL (features and appearances may vary between models)
Rotating the cycle selector knob
turns off each corresponding cycle
indicator. (Features and
appearances vary between models).
POWER button: press once to turn
off indicator. Press twice to exit
service diagnostic mode and return
to standby mode.
START/PAUSE button:
press once to turn
off indicator.
Option buttons: press each
button once to turn off
its respective indicator.
Figure 1b - Key Activation & Encoder Test for Service Diagnostic Mode, Maytag Models
Timed Dry Adjust “+” button:
press once to turn off the
status LEDs.
Press each modifier button
once to turn off its respective
display segment.
Timed Dry Adjust “–” button:
press once to turn off the
seven-segment display.
PAGE 4
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
KENMORE CONTROL PANEL (features and appearances may vary between models)
Rotating the cycle selector knob
turns off each corresponding cycle
indicator. (Features and
appearances vary between models).
POWER button: press once to turn
off indicator. Press twice to exit
service diagnostic mode and return
to standby mode.
START/PAUSE button:
press once to turn
off indicator.
Option buttons: press each
button once to turn off
its respective indicator.
Figure 1c - Key Activation & Encoder Test for Service Diagnostic Mode, Kenmore Models
Time Adjust “+” button:
press once to turn off the
status LEDs.
Press each modifier button
once to turn off its respective
display segment.
Time Adjust “–” button:
press once to turn off the
seven-segment display.
PAGE 5
FOR SERVICE TECHNICIAN’S USE ONLY
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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? Inform
customer that a time-delay fuse is required.
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.
Resistance checks must be made with
dryer unplugged or power disconnected.
IMPORTANT: Avoid using large
diameter probes when checking harness
connectors as the probes may damage
the connectors upon insertion.
Check all harnesses and connections
before replacing components. Look for
connectors not fully seated, broken or
loose wires and terminals, pin insertion,
or wires not pressed into connectors
far enough to engage metal barbs.
A potential cause of a control not
functioning is corrosion or contamination on
connections. Use an ohmmeter to check for
continuity across suspected connections.
SERVICE DIAGNOSTIC MODE
These tests allow 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 SERVICE DIAGNOSTIC MODE
1. Be sure the dryer is in standby mode
(plugged in with all indicators off).
2. Select any three (3) buttons (except
POWER) 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
will be illuminated for 5 seconds with “888”
showing in the three-digit display and a tone
will sound. If there are no saved fault codes,
all indicators on the console will momentarily
turn off, and then only the seven segment
display will come back on and display “888”.
NOTE: The Service Diagnostic mode will time
out after 10 minutes of user inactivity, or shut
down if AC power is removed from the dryer.
Button Press Function Behavior
1st Button - Momentary press
- Press and hold for 5 secs.
- Activates Key Activation
- Exits Service Diagnostics
2nd Button - Momentary press
- Press and hold for 5 secs.
- Activates Service Test Mode
- Software Version Display
3rd Button - Momentary press
- Press and hold for 5 secs.
- Displays Next Error Code
- Clears the Error Codes
SERVICE DIAGNOSTIC MENU TABLE
& Encoder Test
• See “Activating Service Diagnostic Mode” to activate these buttons. Make sure all of step 3 is complete before
activation.
PAGE 6
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
Unsuccessful Activation
If entry into diagnostic mode is unsuccessful,
refer to the following indications and actions:
Indication 1: None of the indicators or display
turn 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 is
unable 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.
If no indicators come on after selecting the
cycle, go to TEST #1, ACU Power Check,
page 12.
Indication 2: Console indicators begin flashing
immediately.
Action: If console indicators begin flashing on
and off immediately, replace the user interface.
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 on page 10 for the recommended
procedure. If there is no saved fault code,
“888” will be displayed.
KEY ACTIVATION & ENCODER TEST
NOTE: The Service Diagnostic mode must be
activated before entering the Key Activation &
Encoder Test; see procedure on page 5.
Active Fault Code Display
in Key Activation & Encoder Test
If the display begins flashing while in the Key
Activation & Encoder Test, it is displaying an
active fault code. Active fault codes are codes
that are currently detected. Only one active
fault code can be displayed at a time.
Entry Procedure
Press and release the 1st button used
to activate Service Diagnostic mode.
The following test will be available:
DIAGNOSTIC: Key Activation
& Encoder Test
Pressing each button will turn off its
corresponding indicator(s) or display segment
and sound a beep (see figures 1a, 1b, or 1c,
pages 2–4).
Rotating the cycle selector knob (on some
models) turns off each corresponding cycle
indicator.
NOTE: A second press of the POWER button
while in Key Activation & Encoder Test mode
exits the Service Diagnostic mode and returns
the dryer to standby mode.
If indicators do not turn off and beep
after pressing buttons and rotating the cycle
selector knob (on some models), go to TEST
#6: Buttons and Indicators, page 22.
Exit Procedure
To exit Key Activation & Encoder Test, press
the POWER button once or twice (depending
on diagnostic procedure) or press and hold
the first button used to activate Service
Diagnostic mode.
SERVICE TEST MODE
NOTE: The Service Diagnostic mode must be
activated before entering Service Test Mode;
see procedure on page 5.
NOTE: If, at any point, the user presses the
POWER button or opens the door during
Service Test Mode, the dryer exits to standby
mode.
NOTE: Door must be closed to perform test.
Dryer must be cool before test to run correctly.
Active Fault Code Display
in Service Test Mode
If the display begins flashing while in Service
Test Mode, it is displaying an active fault code.
Active fault codes are codes that are currently
detected. Only one active fault code can be
displayed at a time.
Entry Procedure
To enter Service Test Mode, press and release
the 2nd button used to activate the Service
Diagnostic mode. All LEDs (except for POWER)
turn off, “888” is displayed for 2 seconds, and
the START button begins to flash.
PERFORM ALL TESTS: Press and release the
START button to run ALL tests indicated in the
chart on pages 7 and 8.
VOLTAGE AND WATER SYSTEM-ONLY
TESTS: Press and hold the START button for
5 seconds after step 3 to run only the voltage
and water system tests.
Exit Procedure
When the test is complete, press the POWER
button to exit Service Test Mode and return
to standby mode.
PAGE 7
FOR SERVICE TECHNICIAN’S USE ONLY
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Step # Action Component User Interface Response
1 User enters Service Test Mode Display shows “888” for
through Service Diagnostics. 2 seconds. All LEDs (except
for POWER) are off, and
the START button is flashing.
2 Press and release START Motor On The display will show “---” until
to begin the L2 Voltage Check. the voltage is available at the UI.
If START is pressed again or
pressed and held before L2 voltage is
available, a tone will sound 3 times.
3 L2 Voltage Check completes. Motor On If electric (Fuel = Electric):
Vrms_L2 and Fuel are published Heater(s) On The UI will report findings per the
to the UI. “Electric Dryer Results Display”
section where L2 Voltage is available,
L1 Voltage Check L1 Voltage is not available,
starts automatically. Heater Voltage is not available,
and Airflow is not available.
If gas (Fuel = Gas):
The display will continue
to show “---”.
If START is pressed again or
pressed and held before L1 voltage is
available, a tone will sound 3 times.
4 L1 voltage check completes. Motor On If electric (Fuel = Electric):
Vrms_L1 and Heater_Voltage Heater(s) On/Off The UI will report findings per the
are published to the UI. “Electric Dryer Results Display”
section where L2 Voltage is
Check for Warm Machine begins available, L1 Voltage is available,
automatically. Airflow begins Heater Voltage is available,
detection algorithm: Status_Airflow = and Airflow is not available.
3 (Detecting).
If gas (Fuel = Gas):
The UI will report findings per the
“Gas Dryer Results Display” section
where Heater Voltage is available
and Airflow is not available.
Press and hold START If a “Detecting Airflow” indicator
to jump to Step 8 and start the is present, it is displayed on
Steam Test (steam models only). the UI.
5 Check for Warm Machine completes. Motor On UI continues to display
Heater(s) On as in Step 4.
Load Mass for Airflow
begins automatically.
Press and hold START
to jump to Step 8 and start the
Steam Test (steam models only).
SERVICE TEST MODE CHART
NOTE: After step 3, press and hold the START button for 5 seconds to jump to the water system test.
Electric dryer performance is optimized for 2-phase, 240 VAC service. If complaint is made regarding electric dryer performance and the
L1 to L2 voltage is ~208 VAC, dryer may be connected to a 3-phase service with reduced wattage that will decrease dryer performance.
PAGE 8
FOR SERVICE TECHNICIAN’S USE ONLY
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Step # Action Component User Interface Response
6 Load Mass for Airflow completes. Motor On/Off If electric (Fuel = Electric):
The update for Status_Airflow Heater(s) On/Off The UI will report findings per the
is published to the UI. “Electric Dryer Results Display”
section where L2 Voltage is available,
L1 Voltage is available, Heater Voltage
is available, and Airflow is available.
If gas (Fuel = Gas):
The UI will report findings per the
“Gas Dryer Results Display” section
where Heater Voltage is available
and Airflow is available.
If a “Detecting Airflow” LED
is present, it is turned off.
If a “Good Airflow” LED is
present, it also displays when
the Status_Airflow = 0.
If a “Check Vent” LED is
present, it also displays when
the Status_Airflow = 2.
7 Service Loads Motor Off UI & Status LEDs continue
Test complete. Heater(s) Off to display as in step 6.
Steam Models Only: “START” is
flashing to start the Steam Test.
Non-Steam Models: The UI waits
for “ServiceTimeout” or pressing
of POWER to go to Standby mode.
STEAM DRYERS ONLY
8 Pressing START begins Display shows “h2o” when test
STEAM_TEST. is running.
9 Steam Test begins. Water Valve On If applicable, UI turns on Drum Light
Drum Light On LED. Drum light is turned on for a
maximum of 30 seconds.
10 STEAM_TEST complete. Water Valve Off Display goes blank and waits
Drum Light Off for “ServiceTimeout” or pressing
of POWER to go to Standby mode.
SERVICE TEST MODE CHART (continued)
NOTE: After step 3, press and hold the START button for 5 seconds to jump to the water system test.
Electric dryer performance is optimized for 2-phase, 240 VAC service. If complaint is made regarding electric dryer performance and the
L1 to L2 voltage is ~208 VAC, dryer may be connected to a 3-phase service with reduced wattage that will decrease dryer performance.
Electric Dryer Results Display
The frame rate will be 0.5 seconds per frame. This sequence will
repeat. The text will be right aligned.
Frame 1: L2
Frame 2: When the voltage is available to the UI, it will display it
without illuminating the colon (range 0 to 200).
Frame 3: L1
Frame 4: When the voltage is available to the UI, it will display it
without illuminating the colon (range 0 to 200).
Frame 5: Htr
Frame 6: When the voltage is available to the UI, it will display it
without illuminating the colon (range 0 to 200).
Frame 7: Air
Frame 8: See “Airflow Display Section”.
When the voltage or airflow is not yet available to the UI, the display
will show “---”.
Gas Dryer Results Display
The frame rate will be 0.5 seconds per frame. This sequence will
repeat. The text will be right aligned.
Frame 1: Htr
Frame 2: When the voltage is available to the UI, it will display it
without illuminating the colon (range 0 to 200).
Frame 3: Air
Frame 4: See “Airflow Display Section”.
When the voltage or airflow is not yet available to the UI, the display
will show “---”.
Airflow Display
Value Setting
0 Airflow not bad
1 Cannot detect
2 Airflow bad; check vent
3 (Default) Detecting
If the result is not yet available, it will be displayed as “---”.
Status_Airflow = 0 will be displayed as: “0:00”.
Status_Airflow = 1 will be displayed as: “0:01”.
Status_Airflow = 2 will be displayed as: “0:02”.
Status_Airflow = 3 will be displayed as: “0:03”.
PAGE 9
FOR SERVICE TECHNICIAN’S USE ONLY
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SOFTWARE VERSION DISPLAY
NOTE: The Software Version Display mode will
time out after 10 minutes of user inactivity and
return to standby mode.
Entry Procedure
To enter Software Version Display, press
and hold the 2nd button used to activate the
Service Diagnostic mode for 5 seconds.
Upon entry, the display will automatically
cycle through the following information:
• UI software revision code (U: major revision
number, U: minor revision number, U: test
revision number)
• UI cycle GEE revision code (y: major
revision number, y: minor revision number,
y: test revision number)
• UI HW GEE revision code (H: major revision
number, H: minor revision number, H: test
revision number)
• UI touch control software revision code
(t: major revision number, t: minor revision
number, t: test revision number)
• UI touch parameters revision code
(o: major revision number, o: minor revision
number, o: test revision number)
• UI audio software revision code (A: major
revision number, A: minor revision number,
A: test revision number)
• ACU software revision code (C: major
revision number, C: minor revision number,
C: test revision number)
• ACU GEE revision code (h: major revision
number, h: minor revision number, h: test
revision number)
• ACU cycle designer revision code (d: major
revision number, d: minor revision number,
d: test revision number)
Exit Procedure
Pressing the POWER button will exit Software
Version Display and return dryer to standby mode.
FAULT/ERROR CODES
Refer to customer fault/error codes below and
service fault/error codes on page 10.
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.
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
“888”, no saved fault codes are present.
Advancing Through Saved Fault/
Error Codes
Procedure for advancing through saved
fault codes:
Press and release g beep tone g most recent fault
the 3rd button code is displayed.
used to activate
Service Diagnostics
Repeat g beep tone g second most
recent fault code
is displayed.
Repeat g beep tone g third most
recent fault code
is displayed.
Repeat g beep tone g fourth most
recent fault code
is displayed.
Repeat g triple beep g back to the most
recent fault code.
Clearing Fault Codes
To clear stored fault codes, enter Service
Diagnostic mode. Then press and hold the
3rd button used to enter Service Diagnostic
mode for 5 seconds. Once the stored fault
codes are successfully erased, the seven
segment display will show “888”.
EXITING SERVICE DIAGNOSTIC MODE
Use either of the two methods below to exit
diagnostic mode.
• Pressing and holding the 1st button
used to activate the Service Diagnostic
mode for 5 seconds.
• Pressing the POWER button once or twice,
depending on diagnostic procedure.
CODE DESCRIPTION EXPLANATION AND RECOMMENDED PROCEDURE
PF Power Failure
PF indicates that a power failure occurred while the dryer was running.
Press START to continue the cycle, or press POWER to clear the display.
AF Restricted Airflow
AF indicates low airflow that may affect dryer performance. Confirm that
airflow system is not blocked. Check lint screen, exhaust duct, exhaust fan.
L2 Low Line Voltage
L2 indicates low L2 voltage (less than 30 V) is detected at the CCU.
• Refer to Fault/Error Code "F4E4" for recommended procedure.
CUSTOMER DIAGNOSTIC CODES
PAGE 10
FOR SERVICE TECHNICIAN’S USE ONLY
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CODE DESCRIPTION EXPLANATION AND RECOMMENDED PROCEDURE
F1E1 Motor Relay Indicates an ACU problem.
Stuck On • Replace the ACU.
F1E3 Incorrect Controller Verify that the part numbers of the ACU and the User Interface are
Installed (on electric correct for the dryer model displaying the fault/error code. Replace
models only) the ACU and/or UI that does not match.
F1E5 Parameter Memory ACU parameter file missing; replace the ACU.
Invalid
F2E1 User Interface (UI) Indicates a stuck button (depressed for over 20 seconds).
Stuck Button This fault code will ONLY appear when in the service diagnostic
mode. See TEST #6: Buttons and Indicators, page 22.
F2E4 UI Software Error: Replace the User Interface.
Incompatible
Parameter File
F2E5 UI Software Error: Replace the User Interface.
Parameter Memory
Invalid
F3E1 Exhaust Thermistor Indicates that the exhaust thermistor is open or shorted. If the
Open/Shorted temperature drops below 18° F (> 50k ohms), the exhaust
thermistor is open. If the temperature is above 250° F (< 500
ohms), the exhaust thermistor has shorted. May occur if the
P14 connector is not plugged into the ACU. See TEST #4a:
Thermistors, page 18.
F3E2 Moisture Sensor Indicates the moisture sensor strip is open or shorted.
Open/Shorted This fault code will only appear when in the service diagnostic
mode. See TEST #5: Moisture Sensor, page 21.
F3E3 Inlet Thermistor Indicates that the inlet thermistor is open or shorted. If the
Open/Shorted temperature drops below 18° F (> 245k ohms), the inlet
thermistor is open. If the temperature is above 391° F (< 328
ohms), the inlet thermistor has shorted. See TEST #4a:
Thermistors, page 18.
F4E1 Heater 1 Failure or Indicates no voltage detected at the heater relay.
Connector Problem • Unplug dryer or disconnect power and check that the wires
are plugged into the heater element(s) and the relay(s) on
the ACU.
F4E2 Heater 2 Failure or Indicates no voltage detected at the heater relay.
Connector Problem • Unplug dryer or disconnect power and check that the wires
(on electric are plugged into the heater element(s) and the relay(s) on
models only) the ACU.
F4E3 Restricted Airflow Indicates low airflow that may affect dryer performance.
• Confirm that airflow system is not blocked; check lint screen,
exhaust duct, exhaust fan.
F4E4 L2 Line Voltage Indicates low L2 voltage (less than 50 V) is detected at the ACU.
Error • Check to see if a household fuse has blown or a circuit breaker
(on electric has tripped.
models only) • Confirm the power cord is properly installed and plugged
into the power outlet.
• Unplug dryer or disconnect power and check the relay
connections on the ACU.
• Gas Models Only: Unplug dryer or disconnect power and check
the P14 connection on the ACU (harness loopback on pins 4 & 5).
F6E2 Communication Error: Communication between the ACU and UI has not been detected.
UI Cannot Hear ACU • Unplug dryer or disconnect power.
F6E3 Communication Error: • Check the harness continuity and connections between the ACU
ACU Cannot Hear UI and UI.
• Check AC and DC supplies. See TEST #1: ACU Power Check,
page 12.
• Replace the User Interface.
• Replace the ACU.
SERVICE FAULT/ERROR CODES
PAGE 11
FOR SERVICE TECHNICIAN’S USE ONLY
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TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE CHECKS & TESTS
No power to dryer. Check power at outlet, check circuit breaker,
fuses, or junction box connections.
Connection problem between AC plug and dryer.See Test #2: Supply Connections, page 13.
Connection problem between ACU and UI. Check connections and harness continuity
between ACU and UI.
Power supplies not present at machine electronics. See Test #1: ACU Power Check, page 12.
User Interface problem. See Test #6: Buttons & Indicators, page 22.
Door not fully closed or striking the door latch. Be sure the door is completely closed,
then press and hold the START button.
Door Switch problem. See Test #7: Door Switch, page 22.
Drive Belt / Belt Switch problem. See Test #3: Motor Circuit, page 15.
Thermal Fuse / Motor problem. See Test #3: Motor Circuit, page 15.
User Interface problem. See Test #6: Buttons & Indicators, page 22.
ACU problem. See Test #1: ACU Power Check, page 12.
Poor airflow. Check lint screen and exhaust vent. Clean
if necessary.
Check the Start/Pause button. Perform Key Activation & Encoder Test.
Moisture Sensor problem. See Test #5: Moisture Sensor, page 21.
Thermistor problem. See Test #4a: Thermistors, page 18.
User Interface problem. See Test #6: Buttons & Indicators, page 22.
ACU problem. See Test #1: ACU Power Check, page 12.
User selected invalid option. Refer customer to “Use and Care Guide”.
User Interface problem. See Test #6: Buttons & Indicators, page 22.
Drive Belt / Belt Switch problem. See Test #3: Motor Circuit, page 15.
Thermal Fuse (elect. only). See Test #4b: Thermal Fuse, page 20.
Door switch problem. See Test #7: Door Switch, page 22.
Motor problem. See Test #3: Motor Circuit, page 15.
ACU problem. See Test #1: ACU Power Check, page 12.
Check installation. Verify proper dryer installation.
Check for L1 and L2. Perform ACU L1 and L2 tests under Service
Test Mode.
Heater system malfunction or open heater coil. See Test #4: Heat System, page 16.
ACU problem. See Test #1: ACU Power Check, page 12.
Heater coil shorted. See Test #4: Heat System, page 16.
Heater relay shorted. See Test #4: Heat System, page 16.
Heater system problem. See Test #4: Heat System, page 16.
Dryness or Dry Level setting for auto cycles. Increase Dryness or Dry Level setting
Lint screen full. Clean if necessary. Refer customer
to “Use and Care Guide”.
Heater vent clogged. Clean if necessary. Refer customer
to “Use and Care Guide”.
Moisture Sensor problem. See Test #5: Moisture Sensor, page 21.
Adjust Customer Focused Dryness Level. See Test #5a: Adjusting Customer-Focused
Dryness Level, page 21.
Steam cycle not selected. Refer customer to “Use and Care Guide”.
No water to valve. Verify water supply is turned on.
No water from valve. See Test #9: Water Valve, page 23.
WATER VALVE NOT DISPENSING
(Water valve is activated intermittently
during the steam cycle.)
WILL NOT HEAT
HEATS IN AIR CYCLE
SHUTS OFF BEFORE CLOTHES
ARE DRY
DRUM WILL NOT SPIN
CONSOLE WON’T ACCEPT
SELECTIONS
WILL NOT POWER UP
- No operation
- No keypad response
- No LED's or display
WILL NOT START CYCLE
(No response when Start button
is pressed.)
WILL NOT SHUT OFF
WHEN EXPECTED
for one or more auto cycles.
WATER LEAKING FROM DRYER
(ON SOME MODELS)
(Too much water being dispensed
during steam cycles)
Residue buildup on water nozzle opening. Unscrew nozzle and clean if necessary.
(ON SOME MODELS)
PAGE 12
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DO NOT REMOVE OR DESTROY
TROUBLESHOOTING TESTS
IMPORTANT: The following procedures
may require the use of needle probes
to measure voltage. Failure to use needle
probes will damage the connectors.
TEST #1: ACU Power Check
This test is used to determine if power is
present at the machine control electronics.
This test assumes that proper voltage is
present at the outlet.
1. Unplug dryer or disconnect power.
2. Check for appropriate line voltages at the
outlet: 240VAC (electric 2-phase), 208VAC
(electric 3-phase), or 120VAC (gas).
If line voltage is present, go to step 3.
If line voltage is not present, check for
tripped circuit breaker or blown household
fuse. If CB (circuit breaker) is not tripped,
have customer check with qualified
electrician.
3. Remove console to access the machine
electronics.
4. ACU VAC – With voltmeter set to AC,
connect black probe to ACU P8-3 (N) and
red probe to P9-2 (L1). (See Figure 2.)
Plug in dryer or reconnect power.
If 120VAC is present, unplug dryer or
disconnect power and go to step 5.
If 120VAC is not present, unplug dryer or
disconnect power and perform TEST #2:
Supply Connections, page 13.
5. ACU +5VDC – With voltmeter set to DC,
unplug connector P2 from the ACU and
connect black probe to ACU P2-3 (ground)
and red probe to P2-1 (+5V DC). Plug in
dryer or reconnect power.
If +5VDC is present, unplug dryer or
disconnect power and go to step 8.
If +5VDC is not present, go to step 6.
6. Unplug dryer or disconnect power. Unplug
P14 from the ACU. Plug in dryer or reconnect
power and repeat step 5.
If +5VDC returns, one of the thermistors
has shorted. To diagnose thermistors,
see TEST #4a, page 18.
If +5VDC is not present, go to step 7.
7. Unplug dryer or disconnect power.
Reconnect P14 to the ACU and unplug P2 from
the ACU. Plug in dryer or reconnect power and
repeat step 5. Perform voltage check inside
header P2 on ACU, between pins 1 & 3—DO
NOT SHORT PINS TOGETHER.
Figure 2 - ACU Connectors & Pinouts
8
3
P2 – WIDE TO UI (+5 VDC)
P2-1 BLK +5VDC
P2-2 BLU DATA
P2-3 YEL 5V GND
P8 – WATER VALVE/DOOR SWITCH
P8-5 OPEN
P8-4 TAN DOOR SWITCH
P8-3 WHT NEUTRAL
P8-2 G/Y CHASSIS GND
P8-1 RED WATER VALVE
(ON SOME MODELS)
P5 – +12VDC
P5-1
P5-2
P5-3 12V GND
P5-4
P5-5
P5-6
P5-7
P5-8 +12VDC
P9 – MOTOR/L1
P9-2 BLK L1
P9-1 LT BLU MOTOR
P13 – MOISTURE SENSOR
P13-2 RED MOISTURE SENSOR
P13-1 BLK MOISTURE SENSOR
P14 – THERMISTORS
P14-6 R/W OUTLET THERMISTOR
P14-5 BLK MODEL RTN (GAS MODEL)
P14-4 BLK MODEL (GAS MODEL)
P14-3 R/W OUTLET THERMISTOR
P14-2 RED INLET THERMISTOR
P14-1 RED INLET THERMISTOR
P13
P5-1
P2
P9
P14
P8
K3
K2
K1
Heater Relay #1
(Gas & Elect.)
L1 – BLK
Heater (E) – VLT
Heater (G) – RED
Heater Relay #2
(Elect. Only)
L1 – BLK
Heater – VLT
Motor Relay
•
= pin-1
P5-3
P5-8
PAGE 13
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
If +5VDC is still missing, unplug dryer or
disconnect power and replace the ACU.
If +5VDC returns, unplug dryer or
disconnect power and check harnesses
and connections between the ACU and user
interface (UI). If acceptable, replace the UI.
8. ACU +12VDC – with voltmeter set to DC,
connect black probe to ACU P5-3 (ground)
and red probe to P5-8 (+12VDC). Plug in
dryer or reconnect power.
If +12VDC is present, go to step 9.
If +12VDC is not present, unplug dryer
or disconnect power and replace the ACU.
9. Unplug dryer or disconnect power.
10. Reassemble all parts and panels.
11. Perform steps under “Service Test Mode”,
page 6, to verify repair.
TEST #2: Supply Connections
This test assumes that proper voltage is present
at the outlet, and for U.S. installations, a visual
inspection indicates that the power cord is
securely fastened to the terminal block (electric
dryer) or wire harness connection (gas dryer).
ELECTRIC DRYER (U.S. Installations):
1. Unplug dryer or disconnect power.
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 4a.
If there is no continuity, replace the power
cord and test the dryer.
If there is continuity, go to step 4.
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 4a.
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
retest dryer.
5. Access the machine electronics without
disconnecting any wiring to the ACU.
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 ACU.
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 ACU.
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 ALL connectors are
fully inserted into the ACU.
9. Visually check that ALL connectors are
fully inserted into the UI.
10. Reassemble all parts and panels.
11. Plug in dryer or reconnect power.
12. Perform steps under “Service Test Mode”,
page 6, to verify repair.
ELECTRIC DRYER (Canadian Installations):
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the top right
corner of the back of the dryer. See figure 3.
3. Access the machine electronics without
disconnecting any wiring to the ACU.
Figure 3 - Remove the cover plate.
COM
N
L1
Figure 4a - Plug-to-terminal connections
for electric dryer.
Power Cord
Plug
Terminal Block
Cover Plate
Remove
Screw
PAGE 14
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
4. With an ohmmeter, check the continuity
from L1 and N plug terminals of the power
cord to the terminals for L1 and N on the
ACU. See figure 4b.
If continuity exists for both connections,
go to step 6.
If an open circuit is found, check the integrity
of the connections of the power cord to the
harness in the dryer; harness to the ACU;
and the integrity of the power cord itself.
5. If it is necessary to replace the power
cord, remove the retaining clip that secures
the cord to the back panel. Disconnect the
cord from the main harness and the ground
wire from the rear panel, then pull out the
power cord.
6. Visually check that ALL connectors are
fully inserted into the ACU.
7. Visually check that ALL connectors are
fully inserted into the UI.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under “Service Test Mode”,
page 6, to verify repair.
GAS DRYER (U.S. and Canadian Installations):
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the top right
corner of the back of the dryer. See figure 3.
3. Check that the power cord is firmly
connected to the dryer’s wire harness.
See figure 5.
4. Access the machine electronics without
disconnecting any wiring to the ACU.
5. With an ohmmeter, check for continuity
between the neutral (N) terminal of the plug and
P8-3 (white wire) on the ACU. The left-hand
side of figure 6 shows the position of the neutral
terminal (N) on the power cord plug. Also see
figure 2, page 12.
If there is continuity, go to step 6.
If there is no continuity, disconnect the
white wire of the main 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.
6. In a similar way, check for continuity
between the L1 terminal of the plug and P9-2
(black wire) on the ACU.
If there is continuity, go to step 7.
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, replace the main harness.
7. Visually check that ALL connectors are fully
inserted into the ACU.
8. Visually check that ALL connectors are fully
inserted into the UI.
COM
Neu
G
L1
L1
M
asse
N
Neu
N
G
Masse
Figure 5 - Power cord-to-wire harness
connection for gas dryer.
Figure 6 - Power cord terminals, gas dryer.
Power Cord
Plug
P9
1
5
1
P/N XXXXXX Rev X
Date Code YDDD-xx
XXXX-XXX
MADE IN COO
L1
COM
P8
L1
N
Neu
N
Neu
Power Cord
Plug
ACU
Figure 4b - Plug-to-terminal connections
for electric dryer.
Power
Cord
Wire
Harness
PAGE 15
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
9. Reassemble all parts and panels.
10. Plug in dryer or reconnect power.
11. Perform steps under “Service Test Mode”,
page 6, to verify repair.
TEST #3: Motor Circuit
This test will check the wiring to the motor
and the motor itself. The following items are
part of this motor system:
NOTE: Refer to strip circuit on page 24
to diagnose drive motor.
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
3. Check for loose, worn, or damaged drum
belt—repair as necessary.
4. Door Switch problems can be uncovered
by following procedure under TEST #7: Door
Switch, page 22; however, if this was not
done, the following can be performed without
applying power to the dryer. Connect an
ohmmeter across ACU 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 Ω).
If not, check harnesses and connections
between ACU and door switch. If good,
replace the door switch assembly.
5. Motor Circuit Check - Access the ACU and
measure the resistance across P8-4 and P9-1.
If resistance across P8-4 and P9-1 is in
the range of 1 to 6 Ω, the motor circuit is
acceptable. Replace the ACU.
Otherwise, continue to step 6.
6. Check the wiring and components in the path
between these measurement points by referring
to the appropriate wiring diagram (gas or electric)
on pages 25 or 26. NOTE: To access motor
system components, slide the top back and
remove the front panel.
ELECTRIC DRYER ONLY: Check the thermal fuse.
See TEST #4b: Thermal Fuse, page 20.
ALL DRYERS: Continue with step 7 below to test
the remaining components in the motor circuit.
7. Check the drive motor. Slowly remove the
drum belt from the spring-loaded pulley, gently
letting the pulley down. See figure 7.
8. Remove the white connector from the drive
motor switch. See figure 8.
9. Remove the bare copper wire terminal from
pin 5 of black drive motor switch. See figure 9a.
Part of Motor System
Electric
Dryer
Gas
Dryer
Drum belt
üü
Door switch
üü
Harness/connection
üü
Thermal fuse
ü
no
Drive motor
üü
Motor capacitors
üü
Centrifugal switch
üü
Machine control electronics
üü
Belt switch
üü
Figure 7 - Slowly remove drum belt.
Drum
Belt
Pulley
1
5
3
4
6
2
Figure 8 - Remove white connector.
White
Connector
Drive Motor Switch
1
5
3
4
6
2
Main Winding: Lt. Blue Wire
in Back and Bare Copper Wire
Start
Winding:
Lt. Blue Wire
in Back and
Bare Copper
Wire
Figure 9a - Main and start winding measure points.
PAGE 16
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
10. Using figure 9a and the strip circuit on
page 24, 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.
If the resistance at the motor is correct,
there is an open circuit between the motor
and ACU. Go to step 11 to check for belt
switch problem.
If the Main or Start winding resistance is
much greater or less than the values listed
in the table above, replace the motor.
11. Check the belt switch by measuring
resistance between the two light blue wires,
as shown in figure 9b, while pushing up the
pulley.
If the resistance reading goes from open
to a few ohms as pulley arm closes the
switch, belt switch is good. If not, replace
the belt switch.
If belt switch is good and there is still an
open circuit, check and repair the main
wiring harness.
12. If the motor has two capacitors attached
as shown in figure 9c, perform the following.
Otherwise, skip to step 13. Remove and
check motor capacitors: each capacitor can
be removed by disconnecting the capacitor
connector and removing the nut on the
capacitor end (see figure 9c). The capacitor
connectors are keyed to facilitate correct
connection, and are black on black for the
Winding
Resistance
in ohms
Contact Points
of Measurement
MAIN3.3–3.6
Lt. blue wire in back at pin 4
and bare copper wire terminal
removed from pin 5 of black
drive motor switch
START2.7–3.0
Lt. blue wire in back at pin 4
and bare copper wire terminal
on pin 3 of black drive
motor switch
run capacitor and light green and gray for the
start capacitor. Contact both leads to check
inductance of capacitors. Start capacitor
inductance should be 189–227 µF; run
capacitor inductance should be 22.3–24.7
µF. Proper torque is 9–12 Nm for each.
13. Reassemble all parts and panels.
14. Plug in dryer or reconnect power.
15. Perform steps under “Service Test Mode”,
page 6, to verify repair.
TEST #4: Heat System
This test is performed when either of the
following situations occurs:
3Dryer does not heat
3Heat 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
Electric
Dryer
Gas
Dryer
Harness/connection
Heater relay
Thermal cut-off
Thermal fuse no
High limit thermostat
Heat element assembly
no
Gas valve assembly no
Centrifugal switch
Outlet thermistor
Inlet thermistor
Machine control electronics
Console electronics and housing
assembly
Gas supply no
Figure 9c - Motor capacitors.
1
5
3
4
6
2
Figure 9b - Checking the belt switch.
Pulley
Belt Switch
Lt. Blue
Wires
PAGE 17
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
NOTE: On the gas dryer, the inlet thermistor
is located at the drum inlet vent. Refer to strip
circuit on page 24 to diagnose heater system.
Dryer does not heat:
Locate the components using figures 10a
and 10b. To access heater system components,
remove the console, top panel, and front panel.
ELECTRIC DRYER ONLY:
3Quick Check: Perform steps under “Service
Test Mode”, page 6, to test for L1 and L2
line voltage.
• If L1 is present, the thermal cutoff is
functional.
• If L2 is present, the centrifugal switch, high
limit thermostat, and the side of the heater
connected to heater relay 1 are functional.
1. Unplug dryer or disconnect power.
2. Slide the top back, remove the front panel,
front bulkhead, and drum to access thermal
components.
3. Check Heaters—on the ACU, use an
ohmmeter to measure the resistance between
the violet wire terminal on heater relay #1
and the violet wire terminal on heater relay #2.
If the resistance is ≤ 50 Ω, go to step 5.
If an open circuit is detected, go to step 4.
Figure 10b - Thermal components,
gas dryer, viewed from front.
Outlet
Thermistor
Thermal Fuse
Gas Dryer
Thermal
Cut-Off
High Limit Thermostat
Flame
Sensor
4. Visually check the wire connections between
each relay and their respective heaters. If the
connections look good, check for continuity
across each heater (violet wire to center red
wire). Refer to strip circuit on page 24.
Replace the heater if it is electrically open.
5. Check Thermal Cut-off—on the ACU, use
an ohmmeter to measure continuity between
P9-2 (L1) and the black wire terminal on heater
relay #1. Then, measure continuity between P9-2
(L1) and the black terminal on heater relay #2.
If there is continuity, go to step 7.
If an open circuit is detected, go to step 6.
6. Visually check the wire connections
between each relay (black wire) and the
thermal cut-off. If the connections look good,
check for continuity across the thermal cut-off.
Replace the thermal cut-off if it is
electrically open.
7. Check High Limit Thermostat—visually
check the wire connections from the heaters
and centrifugal switch to the high limit
thermostat. If the connections look good, check
for continuity across the high limit thermostat.
Replace the high limit thermostat if it is
electrically open.
Figure 10a - Thermal components,
electric dryer, viewed from front.
Inlet Thermistor/High Limit
Thermostat Assembly
Heater
Element
Electric Dryer
Thermal Fuse
Outlet
Thermistor
Thermal
Cut-Off
PAGE 18
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
8. If no open circuit is detected, remove the
P14 connector from the ACU and measure the
outlet thermistor resistance between P14-3
and P14-6 at the connector. Refer to “Outlet
Thermistor Resistance” table on page 19 for
temperatures and their associated values.
If the resistance corresponds to the
temperature, the outlet thermistor is good.
Go to step 9.
If the thermistor resistance does not agree
with the table, replace the outlet thermistor.
9. If the preceding steps did not correct the
problem and L1 and L2 were both detected,
replace the ACU. If L2 was not detected,
suspect the centrifugal switch before
replacing the ACU.
10. Reassemble all parts and panels.
11. Plug in dryer or reconnect power.
12. Perform steps under “Service Test Mode”,
page 6, to verify repair.
GAS DRYER ONLY:
1. Verify the gas supply to the dryer is turned on.
2. Unplug dryer or disconnect power.
3. Perform TEST #4b: Thermal Fuse on page
20. If the thermal fuse is OK, go to step 4.
4. Perform TEST #4c: Thermal Cut-Off on
page 20. If the thermal cut-off is OK, go to
step 5.
5. Locate the high limit thermostat (see
figure 10b, page 17). Measure the continuity
through it by connecting the meter probes to
the red and black wire terminals.
If there is an open circuit, replace both the
high limit thermostat and the thermal cut-off.
Otherwise, go to step 6.
6. Perform TEST #4d: Gas Valve on page
20. If the gas valve is OK, go to step 7.
7. If the preceding steps did not correct
the problem, suspect the centrifugal switch
before replacing the ACU.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under “Service Test Mode”,
page 6, to verify repair.
Heat will not shut off:
ALL DRYERS:
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
3. Remove connector P14 from the ACU
and measure the resistance between P14-3
and P14-6 at the connector. Refer to “Outlet
Thermistor Resistance” table on page 19 for
temperatures and their associated values.
If the resistance corresponds to the
temperature, the outlet thermistor is good.
If the thermistor resistance does not agree
with the table, replace the outlet thermistor.
4. Check heater coil(s) for a short to ground
(usually inside the heater box). Repair or
replace if necessary.
5. Plug in dryer or reconnect power.
6. Run an “AIR” only timed dry cycle (no
heat). Check heater relay output(s) on ACU.
Unplug dryer or disconnect power. With a
voltmeter set to AC, connect voltmeter to
terminals 1 & 2 for heater relay #1. Plug
in dryer or reconnect power. Measure the
voltage across terminals 1 & 2 for heater
relay #1. If equipped, repeat procedure
with heater relay #2.
If voltage is present (~240VAC for electric,
~120VAC for gas), the relay is open and
working normally.
If little or no voltage is present, the relay is
closed and heater is activated. Unplug dryer
or disconnect power and replace the ACU.
7. Unplug dryer or disconnect power.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under “Service Test Mode”,
page 6, to verify repair.
TEST #4a: Thermistors
NOTE: Refer to strip circuit on page 24
to diagnose outlet and inlet temperature
thermistors.
Outlet (Exhaust) Thermistor
The ACU monitors the exhaust temperature
using the outlet thermistor, and cycles the
heater relay on and off to maintain the desired
temperature. NOTE: Begin with an empty dryer
and a clean lint screen.
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
3. Remove connector P14 from the ACU
and measure the resistance between P14-3
and P14-6 at the connector. The following
table on page 19 gives temperatures and their
associated resistance values.
PAGE 19
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
NOTE: All thermistor resistance measurements
must be made while dryer is unplugged and
connector removed from ACU.
If the resistance is OK, the outlet thermistor
is good. Proceed to step 4.
If the thermistor resistance does not agree
with the table, replace the outlet thermistor.
4. Check P14-3 and P14-6 to dryer cabinet
ground. If either pin indicates continuity
to ground (short), replace wiring harness;
otherwise, proceed to step 5.
5. If the preceding steps did not correct the
problem, replace the ACU.
Temperature Levels Incorrect – If no error code
is displayed and the connections to the thermistor
are good, check the exhaust temperature value
at any or all of the temperature levels in question,
using the Timed Dry cycle.
IMPORTANT: Be sure EcoBoost or Energy Saver
(if available) is turned OFF before testing.
1. Remove load from dryer and disconnect
external vent.
2. Plug in dryer or reconnect power.
3. Run a TIMED DRY cycle (Mixed + Timed
Dry on Whirlpool models) of at least 2 minutes
in duration and select a temperature setting
using heat.
4. Using a calibrated temperature probe,
take a temperature measurement in the center
of the exhaust outlet. The correct exhaust
temperatures are as follows:
If the temperature is not reached within
~7 minutes, check voltage level and vent
blockage, and then retest.
If the temperature probe does not agree
with temperature setting, replace the outlet
thermistor.
TEMP.
°F (°C)
RES.
RANGE
k ohms
TEMP.
°F (°C)
RES.
RANGE
k ohms
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
OUTLET THERMISTOR RESISTANCE
TEMPERATURE
SETTING
HEAT TURNS OFF*
°F (°C)
HEAT TURNS ON
°F (°C)
155° ± 5° (68° ± 3°)
140° ± 5° (60° ± 3°)
125° ± 5° (52° ± 3°)
105° ± 5° (41° ± 3°)
EXHAUST TEMPERATURES
10–15° (6–8°)
below the
heat turn off
temperature
(appearance may vary)
If the temperature probe confirms the
temperature setting, retest at a different
temperature setting.
5. If the preceding steps did not correct the
problem, replace the ACU.
Inlet Thermistor
NOTE: On the electric dryer, the inlet thermistor
is part of the high thermostat assembly
(see figure 10a). On the gas dryer, the inlet
thermistor is located at the drum inlet duct
(see figure 16, page 27).
The ACU monitors the inlet temperature using
the inlet thermistor. The inlet thermistor (along
with the outlet thermistor) is used to detect air
flow, and assists in calculating load size.
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
3. Remove connector P14 from the ACU and
measure the resistance between P14-1 and
P14-2 at the connector. The following tables
(electric & gas) give temperatures and their
associated resistance values.
NOTE: All thermistor resistance measurements
must be made while dryer is unplugged and
connector removed from ACU.
If the resistance is OK, the inlet thermistor
is good. Proceed to step 4.
If the thermistor resistance does not agree
with the table, replace the inlet thermistor.
TEMP.
°F (°C)
RES.
RANGE
k ohms
TEMP.
°F (°C)
RES.
RANGE
k ohms
68° (20°) 61.2–63.7 131° (55°) 14.5–15.3
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
122° (50°) 17.6–18.5
ELECT - INLET THERMISTOR RESISTANCE
TEMP.
°F (°C)
RES.
RANGE
k ohms
TEMP.
°F (°C)
RES.
RANGE
k ohms
68° (20°) 57.5–67.6 131° (55°) 14.1–15.6
77° (25°) 46.1–53.8 140° (60°)11.8–12.9
86° (30°) 37.4–43.1 149° (65°)9.9–10.8
95° (35°) 30.4–34.7 158° (70°)8.4–9.0
104° (40°) 24.9–28.2 167° (75°)7.1–7.6
113° (45°) 20.5–23.0 176° (80°)6.0–6.4
122° (50°) 16.9–18.9
GAS - INLET THERMISTOR RESISTANCE
PAGE 20
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
4. Check P14-1 and P14-2 to dryer cabinet
ground. If either pin indicates continuity
to ground (short), replace wiring harness;
otherwise, proceed to step 5.
5. If the preceding steps did not correct the
problem, replace the ACU.
TEST #4b: 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. Slide the top back, remove the front panel,
front bulkhead, and drum to access the
thermal fuse.
3. Using an ohmmeter, check the continuity
across the thermal fuse.
If the ohmmeter indicates an open circuit,
replace the 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 removing
console, top panel, front panel, front
bulkhead, and drum.
3. Using an ohmmeter, check the continuity
across the thermal cut-off. See figures 10a
and 10b, page 17, for location.
4. If the ohmmeter indicates an open circuit,
perform the following:
ALL DRYERS: Replace both the thermal
cut-off and high limit thermostat. In addition,
check for blocked or improper exhaust
system, and, on electric dryers, for heat
element malfunction.
TEST #4d: Gas Valve (Gas Dryer)
1. Unplug dryer or disconnect power.
2. Access the gas valve by sliding the top
back and removing the front panel, front
bulkhead, and drum.
3. Use an ohmmeter to determine if a
gas valve coil has malfunctioned. Remove
harness plugs. Measure resistance across
the terminals (see figure 11). Readings should
match those shown in the following chart;
if not, replace coils.
4. Disconnect the ignitor plug from the
burner. Using an ohmmeter, measure
the resistance across the ignitor’s 2-pin
connector. Resistance should be 50-500 Ω.
If resistance readings are outside the range
or open, replace the ignitor.
If resistance readings are within range,
reconnect the ignitor plug and continue
to step 5.
5. Disconnect the wires going to the flame
sensor terminals. Using an ohmmeter, measure
across the two sensor terminals for continuity.
If there is continuity, reconnect the sensor
wires and continue to step 6.
If the reading is open, the flame sensor
needs replacing.
6. Reassemble all parts and panels before
reconnecting power.
7. Plug in dryer or reconnect power.
8. Run a high-temp TIMED DRY cycle
(mixed/timed dry on Whirlpool) of at least 2
minutes in duration.
9. Watch the ignitor for a couple of minutes
through the “peek window” in the side. If the
ignitor stays red hot and the gas does not come
out and ignite, the flame sensor needs replacing.
NOTE: If ignitor does not come on, line voltage
may not be present at the gas burner. The motor
centrifugal switch may be suspect.
Black
Light Blue
White
Figure 11 - Measuring gas valve resistance.
Terminals
Resistance
in ohms
1 to 2 1400 ± 70
1 to 3 570 ± 28.5
4 to 5 1300 ± 65
GAS VALVE RESISTANCE
White
Light Blue
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Whirlpool Cabrio,- WED7300X Manuel utilisateur
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