We keep getting a "F4" error code and alarm about 1 to 5 minutes after turning on our F&P 755T wall oven at the main power isolation switch and setting the clock. The same error code comes up randomly while using the oven and it resets the mode and temperature settings. I suspect the error is related to the temperature probe and would be happy to disable it if that would fix the problem. I have replaced the control unit twice in the past and don't realy want to pay another $260 to do it again.