Whirlpool Microwave Error Code F2 — Shorted Thermistor / Temperature Sensor
What this means
The F2 error code on Whirlpool microwaves indicates the oven cavity thermistor (temperature sensor) has a short circuit — it's reading an abnormally low resistance, making the control board think the oven is extremely hot. The microwave will not operate as a safety precaution. This can be caused by damaged thermistor wires touching each other, moisture in the thermistor assembly, or an internal failure of the sensor itself.
Step-by-step fix
3 stepsReset the microwave
Unplug the microwave for 5 minutes and plug it back in. If moisture caused a temporary short, allowing the sensor to dry out may clear the error.
If the microwave was recently used to heat very steamy food, moisture may have condensed on the thermistor — wait an hour and try again.
Access and inspect the thermistor wiring
Unplug the microwave. Remove the outer cabinet cover. SAFETY: Do not touch the high-voltage capacitor. Trace the thermistor wires and look for damage, bare wire spots, or places where the two wires may be touching each other or touching the metal chassis.
A shorted thermistor reads near zero ohms instead of the expected 50,000+ ohms — even a tiny area of bare wire contact can cause this.
Test the thermistor
Disconnect the thermistor from the control board. Test resistance with a multimeter. At room temperature, it should read approximately 50,000–60,000 ohms. A reading near zero or very low indicates a short in the sensor itself.
If the thermistor reads correctly when disconnected but the error persists when connected, the wiring or the board input circuit may be shorted.
When to call a professional
Microwave internal repair is dangerous due to the high-voltage capacitor. Professional service is recommended unless you have specific training in microwave electronics.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Oven Cavity Thermistor
Part #W10250879 · $15–$30
Required if thermistor reads shorted (near zero ohms)
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