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My name is Billy. Your HH84AA...does it have black plastic relay covers or clear plastic cubes on the board?
reason I ask....The board with clear plastic covers has a significant failure rate of the blower running nonstop. Sometimes tapping the cube will shut it off...but they always stick again.
Your issue is the board,,,change board and you will see they have upgraded the relays.
there are several aftermarket vendors like ICM271....or you can go OEM HH84AA011
But yes the ICM is a direct change out.