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have you had the recall done on this unit? go to www.askousa.com to register and they will replace the control board or timer. It is supposedly a fire hazard and they say to stop using it. As far as the overfill goes, do you see it keep filling then overfill, or could this be something thats blocking the drain, then causing the next fill cycle to overfill the unit cause it cant drain the previous cycles water. this can also happen with a bad drain pump. I have never seen a pressure switch fail on one of these askos, so would suspect the valve itself had sediment built up in it, or maybe a bad timer/control board