We have a new to us oven. It was purchased years ago for kitchen remodel that didn't happen and we bought it off Craigslist. It had never been installed until it got to our house--but it clearly is not under warranty. We used the oven for two days with it hardwired into the box--just sitting on a table in front of the cabinet. Just to test it--before we cut up the cabinets. Worked great. Cut up cabinets. Now getting F1 code. The only way to get the oven to not beep and flash FI is kill the circuit breaker. BUT...if you kill it and then turn it back on--and dash to the kitchen and turn the oven on...it works just fine. It cooked pizza and roasted cauliflower last night--running flat out for 1.5 hours--with no codes. As soon as we turned it off, however, it was back to FI within minutes.
This is what we've done:
1) re-seated the ribbon cable--it made it 6 hours and then F1'd again
2)totally disconnected the ribbon cable--and then turned it back on--it F)'d within 2 minutes
It's clearly EITHER the ERC or the ribbon-cable connection.