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How to troubleshoot an F28 error code in a Whirlpool Duet Sport washer

Posted by Samurai Appliance Repair Man, in Washing Machine Repair 30 June 2011 · 2,161 views

OK ... going by memory here.

- First ohm out your motor. You should have approx 6 ohms between 1-2,1-3 and 2-3. You should also get 120 ohms on 5-6 which is the tach on the motor. If that is good ...

- Open up the little flap on the MCU board. Start a regular wash cycle and check for voltages at the MCU. On the pink wires you should get 120v. (With the wires connected to the MCU - don't disconnect them to check the voltage.) On the connector with the little blue wires - you should have 5 vDC.

- If you are getting the correct voltages at the MCU and the motor ohms out good, then you have a bad MCU.

- If you are not getting those readings at the MCU, then check continuity on the blue wires and the 2 pink wires from the CCU to the MCU.

- If you have continuity on all wires and the connections look good, then you have a bad CCU.


Part links ==> MCU, CCU

Source: whirlpool duet wfw9200sq00







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