Whirlpool Steam Fresh washer.

Whirlpool Steam Fresh washer. Had it 4 months, techs have been out 4 times already trying to fix a F 35 code. Starts a cycle, runs for about 20 seconds, then a suds error comes up. A few minutes later, F 35 pops up, and stays on until I cycle power. Almost every time I try to use it, exact same thing happens. I havent even used soap in it for at least the last 5 loads, so I know its a false suds error. Tech that was out yesterday replaced some sort of circuit board. Said something about a EPOM upgrade (I think thats what he called it). First load...same problem. Any suggestions?