Whirlpool Microwave Error Code -F3-

The -F3- error code indicates a thermistor failure detected during convection operation. Specifically, the control board monitored the oven cavity temperature and found that it did not change as expected while the convection system was running. This points to a problem with the thermistor, the heating element, or the wiring between the sensor and the control board.

No. The -F3- error indicates the convection system is not operating correctly and the oven has likely stopped heating as a safety measure. Continuing to use the appliance in this state could produce uneven or no cooking results and may risk further component damage. The microwave should not be used until the fault is diagnosed and repaired.

Resetting the microwave by unplugging it for a few minutes may temporarily clear the error display, but the code will return as soon as the microwave attempts to run a convection cycle again if the underlying problem has not been fixed. A reset does not repair the thermistor, heating element, or wiring. The root cause must be diagnosed and corrected for the error to be permanently resolved.

A knowledgeable DIYer can perform basic diagnostics such as visually inspecting the heating element and wiring harness, and testing the thermistor with a multimeter. However, working inside a microwave involves high-voltage components including a capacitor that can retain a dangerous charge even when unplugged. If you are not comfortable safely discharging the capacitor and working around high-voltage parts, a qualified technician should perform the repair.

Repair costs vary depending on which component has failed. A replacement thermistor typically falls in the range of $15 to $50 for the part alone, while a heating element can range from $30 to $80 or more depending on the model. If professional labor is needed, total repair costs including parts and service can range from $100 to $250 or higher.