Whirlpool Microwave Error Code F2-E3

The F2-E3 error code on a Whirlpool microwave indicates that the oven cavity temperature has exceeded 950°F (510°C) during the CLEAN mode cycle. This threshold is monitored by a temperature sensor, typically a resistance-based probe whose resistance changes in a predictable way as temperature rises. When the control board reads a temperature signal corresponding to conditions above this limit, it shuts down the cycle and displays the fault code to prevent damage to internal components or a potential safety hazard.

The most likely hardware causes fall into two categories: a faulty temperature sensor or a control board issue involving welded relay contacts. A sensor that has failed in a shorted condition can send a false high-temperature reading to the control board even when the cavity is not actually overheating. Measuring the sensor's resistance and comparing it against the expected value for a given temperature is the key diagnostic step to rule this out. A disconnected or corroded sensor connector can also produce an erratic signal that triggers the fault.

On the control board side, relays that switch heating elements on and off can sometimes weld closed due to arcing or overcurrent events. When a relay welds shut, it allows continuous power to the heating circuit regardless of what the control board commands, which can cause actual runaway temperatures during the clean cycle. After disconnecting power and checking the sensor connection and resistance, inspect the control board relays for signs of overheating, discoloration, or physical damage.