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Whirlpool Duet Diagnostic Test Mode

Duet Troubleshooting Guide
Duet Diagnostic Test Mode
Duet Washer Test Overview
Duet Washer Error Codes
Duet Washer Part Testing
Duet Wire Diagram

NOTE: The control must be in the OFF state before starting the diagnostics “Key Dance”

  • Close the washer door.
  • Select any one key except “Stop/Cancel” and Control Lock.
  • Using the same key…
    Press/hold for 2-5 seconds ➔ Release for 2-5 seconds
    Press/hold for 2-5 seconds ➔ Release for 2-5 seconds ➔ Press/hold for 2-5 seconds
  • If you got it right all the lights on the Duet washer’s control should light up, and any error codes in the washer’s memory will be displayed.
  • You can cycle through the last four errors by pressing the same button you used to enter the Duet diagnostics.
  • After the last code is given the washer will display your washer’s user interface,Main control, and motor control software version.
  • After that all the console lights will turn on again for 5 seconds and the washer will do a Duet Quick Test Cycle

Note: If you need to stop the Duet Quick Diagnostics cycle for some reason, it will cancel with the Pause/Cancel button.

Whirlpool Duet Diagnostic Test Overview

IndicationControl ActionParts Checked

C:00

Washer Door is Locked

Duet door lock system

C:01

Duet opens cold water valve

Duet washer flowmeter, Cold water inlet valve

C:02

Detergent distribution system is set to the prewash position

Duet dispenser motor

C:03

Duet opens hot water valve

Duet hot water valve

C:04

Duet washer basket rotates clockwise at wash speed

Duet washer motor, MCU control

C:05

Duet heater is turned ON.
(if present on your model)
Basket rotates clockwise with wash speed. If there is not enough water in the tub, the water valve will be opened to fill-in the minimum water level.

Duet washer Heater, temperature sensor

C:06

Duet drain pump is turned ON

Duet drain pump

C:07

Duet washer basket rotates counterclockwise
from 35 to 90 rpm
within 15 seconds

Duet washer motor, MCU control

C:08

Basket rotates counterclockwise
with max. spin speed
800 – 1000 rpm
(Depending on your Duet model)

Duet washer motor, MCU control

Whirlpool Duet Washing Machine Error Codes

Error Code

What the Error Code Means

F01EEPROM Error
Basically, the main control is not communicating with itself or it’s having a major malfunction… This is bad…
check that all the connections to the main control are fully connected.
Try to reset the Duet washer’s memory by unplugging the washer for 2 minutes. If the washer is still having a problem you likely need a new main control board.
F03Duet Heater is Shorted to Ground
With a multimeter the heater should normally show a very weak connection to the washer’s grounded cabinet. (2MΩ)
What you should not detect, is a strong connection to the cabinet…
How to Use a Multimeter
F11MCU (Duet Motor Control Unit) Error 
The motor control board is having some problems… This is bad…
check that all the connections to the main control and motor control are fully connected.
Try to reset the Duet washer’s memory by unplugging the washer for 2 minutes.
Do a Duet Washer Quick Test and check for motor function.
Check the Duet Washer Motor. If the washer is still having a problem you likely need a new motor control board.
F20No Fill
The washer has been trying to fill with water but the pressure sensor has not detected any water in the washer tub after 30 seconds.
Check to make sure your home water valves are on and that water is getting to the washer.
The next most likely cause is that the washer’s water valves are not opening for some reason.
(Check the valves with a Duet Quick Diagnostic Test)
F21Long Drain Error
Duet washer long drain errorThis is the most common Duet washer error code! The F21 long drain error is referring to duration not length.
If it takes longer than 8 minutes to drain your highly water efficient washer then ether the drain system is pugged up with who knows what or the drain pump is having a problem.
The best way I have found to deal with the water when your washer’s drain pump isn’t working is to use a shop vac and pull from the drain hose. If that works the your pump is highly suspect.
If it doesn’t work then you almost certainly have a clog in your Duet washer’s drain system and the pump may be fine.
F22Door Lock Error 
Your Duet washer was not able to lock the door after 6 times… You can’t say it didn’t try. Check that the tab on the washer’s door that inserts into the door lock is not broken, that it’s properly aligned with the door lock hole, and that there is nothing that may be jamming the lock.Check the door lock switch with a multimeter at the control wires using the wire diagram
F23Heater Error 
If the Duet washer is unable to get the water temperature above 86ºF in the first 40 minutes it stands to reason that the washer’s heater isn’t working.
Check that the heaters wire connections are okay.
Check the heater for resistance… It should not be open.
F24Temperature Sensor Error 
Check that all the wire connections from the main control to the temperature sensor are well connected. (The Duet washer temp sensor is located at the back of the tub need the bottom, next to the heater.)
Check the Temperature Sensor
F25Motor Tachometer Error
Check all the wire connections from the washer’s main control to the motor and tachometer at the control’s MS2.1 and MS2.1 connections.
The Duet motor tachometer which detects motor speed, should read approximately 115Ω when checked with a multimeter
How to Use a Multimeter
If it is actually bad then you will need to replace the washer’s motor.
F26Door Switch Error
Possible causes…
1. Your Duet washer has a bad door switch.
2. You have not opened to door for 3 wash cycles…
3. Trying to start a cycle when the washer door is open.
F27Overflow Error
1. check that the washer’s water valves are closing all the way and water is not filling into the tub when it shouldn’t be. If water is slowly filling the tub even when the washer is unplugged you need to replace the washer fill valves. If it’s filling quickly and it suddenly stops when you unplug the washer you may have a bad main control board.
2. Check that the drain pump is working properly.
3. Check the pressure sensor.
F28Serial Communication Error
This error means that the main control and the motor control are not able to communicate.
Try unplugging the washer for 2 minutes to reset the washer’s memory.
Check that all the wire connections between the two control boards are fully connected.
If everything looks good on the connection end then how lucky do you feel?! The problem could be in ether the main control or the motor control boards
This problem is usually a good one to have a professional repair person diagnose, because both possible boards are very expensive and you don’t really want to guess wrong…
F29Door Unlock Error
A Door Unlock Error occurs if the door cannot be unlocked. It will try to unlock the door 6 times before displaying this error.
Potential Causes
• Door lock is broken.
• Check door lock switch for foreign objects
• Check wire harness connections to the door lock switch and the main control board at the DLS, DL, and DCS connections.
F30Dispenser Error
The detergent dispenser was not able to reach it’s destination.
The dispenser tray in your Duet washer has a small motor on top that moves a guide to direct water into the proper cup. Remove the washer to and do a Duet Washer Quick Diagnostic Test step C02 should move the dispenser linkage so you can see what’s the hang-up.
F31Motor Control Unit Error
The Duet washer uses a second control board to control the direction and speed on the washer motor.
This error is saying that the motor control board has gotten too hot and may need to be replaced.
Try unplugging the washer for 2 minutes and see if it will do a Duet Washer Quick Diagnostic Cycle
F32Pressure Switch Error
The Duet washer uses a pressure sensing switch to detect the water level in the wash tub. The sensor uses a small tube that is attached to the outer tub. The pressure switch is very rare to fail so the first thing to check is that the hose is not pinched closed and doesn’t have any holes in it.
F42Low Voltage to MCU Error
This Duet error is saying that the voltage to the washer’s motor control unit is too low.
Check that there is proper voltage at the home’s electrical socket (apx. 120VAC)
Next check all connections from the main control to the MCU.
F70Main Control Heartbeat Failure Error
The Duet washer’s main control board is unable to connect to the washers user interface. (the control buttons)
Check all the connections between the User interface and the washer’s main control board.
Hard to narrow this one down. If all the buttons seem to be working then you likely have a main control board problem.
If not flip a coin…
F71User Interface Heartbeat Failure Error
The Duet washer’s main control board is unable to connect to the washers user interface. (the control buttons)
Check all the connections between the User interface and the washer’s main control board.
Hard to narrow this one down. If all the buttons seem to be working then you likely have a main control board problem.
If not flip a coin…
SUDSuds Error
The washer is having a difficult time draining. normally this is due to too much soap or non HE detergent being used.
The washer’s drain pump cannot pump soap suds, it needs to be in liquid form. So try to run a Spin/Drain cycle to clear out the soap.
If there does not seem to be suds, check all the connections to the pressure switch and drain pump.
If all that looks good check the drain system for blockages or you may have a bad drain pump.
rLLoad Detected W/Clean Cycle Error
A load of clothes was detected during a Clean Washer cycle.
unload the washer and do a Duet Diagnostics Cycle to see if the rest of the washer is working properly.

Whirlpool Duet Washing Machine Part Testing

Duet Washer Drain Pump

  • The washer’s bottom panel can be removed for easy pump access by removing the 1/4″ screws on the bottom edge of the washer front.
  • The Duet washer drain pump has a coin trap that will hopefully catch anything you forgot to take out of your pockets.
  • Before you open the drain pump try to remove as much water as possible from the washer with a shop-vac and have some towels ready.
  • The drain pump should measure apx. 15.8Ω when checked with a multimeter from the DP2.1 and DP2.1 connections at the washer’s main control board.

Duet Washer Motor & Motor Controller

  • The Duet washer motor should measure apx. 8Ω across each of the 3 motor connections (1,2 & 3) when measured with a multimeter.
  • The Duet washer motor has a built in tachometer (connections 4 & 5) which should normally measure about 115Ω
  • The motor control unit gets 120 volts AC from the washer’s main control at the MS2.1 and MS2.2 connections.

Duet Washer Temperature Sensor

    • The Duet washer temperature sensor changes resistance values at the temperature changes. So in order to test the sensor you first need to know about what temperature it is… then use the chart below and a multimeter to see if it is within the correct range.

Duet washer temp sensor chart
 

Whirlpool Duet Washer Wire Diagram

Whirlpool Duet washer wire diagram

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