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The error code F28 means one or both of these parts are bad.
Motor Control Unit (8540135
Microcomputer Machine Control Unit (8540788
It would be a good idea to order both, as both components have been problematic for
error code F28
If you find either the MCU or the CCU(Microcomputer Machine Control Unit) fixed it.
Here's the online repair manual for your
Whirlpool Duet Sport, but its identical to your HE2.
Give it time to download.
On page# XXXXX it shows how to access your MCU.https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/6545d78b3f479480852571650061b1ba/$FILE/8178558.pdf
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