Whirlpool Microwave Error Code F3-E3

F3-E3 indicates the oven cavity temperature sensor reported a reading above 510°C (950°F) during CLEAN mode. The control board triggers this fault to shut down the appliance and prevent damage or a fire hazard. The root cause is either a faulty temperature sensor producing a false high reading, or a welded relay on the control board allowing uncontrolled heating.

No, you should not attempt to use the microwave while this fault is active. The F3-E3 code indicates a potential overtemperature condition, which could be caused by a relay stuck in the closed position that allows continuous uncontrolled heating. Continued use before the fault is diagnosed and repaired poses a fire risk.

Repair costs vary depending on the faulty component. A replacement temperature sensor is typically the lower-cost repair, with parts often ranging from $20 to $60 depending on the model, plus labor if a technician is used. A control board replacement is more expensive, with parts generally ranging from $80 to $200 or more, and professional labor can add $100 to $200 on top of that depending on your area.

A knowledgeable DIYer can start by inspecting the sensor wiring connector and reseating it, then measuring the sensor resistance with a multimeter. The sensor should read approximately 1080 ohms at 21°C (70°F), and a reading far outside that range at a known temperature indicates the sensor needs replacement. If the sensor tests good, the control board relay is the likely cause and that repair is more complex, often requiring full board replacement.

Disconnecting power to reset the control board may temporarily clear the fault display, but it will not fix the underlying cause. If the sensor is faulty or a relay is welded closed, the F3-E3 code will return as soon as the appliance attempts a clean cycle or reaches the relevant temperature threshold. A proper repair requires diagnosing and replacing the defective component.