Error code F28 indicates that one of the below part is bad
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Motor Control Unit (8540135)
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Microcomputer Machine Control Unit (8540788)
If you find either the MCU or the CCU(Microcomputer Machine Control
Unit) you can fix it,
Here's the online repair manual for Whirlpool Duet Sport, but its identical to your HE2.
Refer page# 4-20 it describes how to get to MCU.
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/6545d78b3f479480852571650061b1ba/$FILE/8178558.pdf
This post was in error and I can't delete it but here's the solution
SOLVED! my own F28 error. and I got my washer working. First of all the motor control unit(MCU) was definitely bad. If you look to the bottom of the washer remove that panel and take out the MCU. Next remove the circuit board from the casing. There are 2 clips hold it in place. My MCU and many other have burnt out resistors and thats the sign that its needs replacing. So I got a used MCU but that did not fix the problem. HERE's my solution...The BLUE 3 pin wires that go to the MCU is the serial communication cable. Failure in communication results in F 28 error. I thought it was odd I was still getting the F28 error even after replacing the MCU. So I looked at the Blue 3 wire harness and found the pins were really sung in. I used a needle to pry them out of the grooves and got them closer then plugged back in the harness and reconnected the MCU. Low and behold the washer started working. BUT wait there was another problem. My dispenser was spinning round and round and round and won't stop. I figured that cause the original problem of over heating and burning the MCU. I looked at the harness to the dispenser unit and the pins were also spread apart. I used the needle to brind the pins closer and that fix the problem. I ran the diagnostics and for the first time in 2 months the diagnostics tests all worked. My advice to anyone is to check the MCU, if its burnt, replace it, but if it still not working, use a needle and get the pins on the wire harness closer together on the MCU. Do the Same to the Control unit.
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