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![](https://files.manualsfile.com/64007991_wfc8090gx/bg1a.png)
2-8
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Whirlpool Smart All-In-One Washer & Dryer
DIAGNOSTICS & TROUBLESHOOTING
For Service Technician Use Only
Dry thermistor NTC open or shorted See TEST #12b: Dry Thermistor Sensor, pg. 3-20.
Wash heater relay error See TEST #8: Wash Heang Element, pg. 3-12.
Dry heater relay error See TEST #12a: Dry Heang Element, pg. 3-19.
Dry fan motor error See TEST #13: Dry Fan Motor, pg. 3-21.
Door switch error See TEST #4: Door Lock System, pg. 3-8.
Lock failure See TEST #4: Door Lock System, pg. 3-8.
Unlock failure See TEST #4: Door Lock System, pg. 3-8.
Door not open error Make sure to open and close the washer/dryer door
between cycles.
Communicaon between the Appliance
Control Unit (ACU) and Motor Control Unit
(MCU) has not been detected.
Try recycling power to washer/dryer.
• Verify connuity in cable between ACU (JI7) and MCU
(J3). See wiring diagram on page 3-3.
• Check AC and DC supplies. See TEST #1 (ACU Power
Check) on page 3-4.
• See TEST #2 Human Machine Interface on page 3-6.
Communicaon between the Appliance
Control Unit (ACU) and Human Machine
Interface (HMI) has not been detected.
Try recycling power to washer/dryer.
• Verify connuity in cable between ACU (J16) and HMI
(CN1). See wiring diagram on page 3-3.
• Check AC and DC supplies. See TEST #1 (ACU Power
Check) on page 3-4.
• See TEST #2 Human Machine Interface on page 3-6.
Unknown cycle ID error See TEST #1: ACU Power Check, pg. 3-4.
MCU over temp error
• Check for obstrucon between spin basket and outer tub.
• Check harness connuity and connecons between ACU
and motor. See TEST #3: Motor Circuit, pg. 3-7.
MCU over current error/internal failure. See TEST #3: Motor Circuit, pg. 3-7.
Motor disconnected error Check harness connuity and connecons between ACU and
motor. See TEST #3: Motor Circuit, pg. 3-7.
Motor over temp error • Check for obstrucon between spin basket and outer tub.
• Check harness connuity and connecons between ACU
and motor. See TEST #3: Motor Circuit, pg. 3-7.
Locked rotor See TEST #3: Motor Circuit, pg. 3-7.
Inlet valve error/ll meout See TEST #5: Inlet Valve, pg. 3-9.
Overow Make sure drain hose and drain pump lter are not plugged.
Verify funconality of water inlet valve, water level sensor,
and drain/recirculaon pump.
• See TEST #5: Inlet Valve, pg. 3-9.
• See TEST #6: Pressure Switch, pg. 3-10.
• See TEST #7: Drain/Recirculaon Pump, pg. 3-11.
Long drain/drain meout Check drain hose installaon for proper height, check drain
hose and lter for obstrucons, and make sure drain hose
is not sealed into drain pipe. Check funconality of drain/
recirculaon pump.
• See TEST #7: Drain/Recirculaon Pump, pg. 3-11.
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