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Have you tried turning power off and back on to see if board will reset?
Ok is the error still showing reversed polarity and if so do you have a meter to check ?
What is the error code?
Try swapping the blue and red wires on control board from transformer.SEC1 and SEC 2.
It is not unusual for polarity to get reversed if utility company changes out a transformer down the road.
If changing the blue and red does not solve issue you will need to replace the board.
If you have further questions, please let me know.
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