Kenmore Microwave F2 Error Code — What It Means
The F2 error code on a Kenmore microwave most commonly indicates a thermistor short or thermistor sensing fault. The control board detects an invalid temperature sensor signal and interprets it as a heating or sensing failure during cooking. On Kenmore microwave fault charts, F2 is described as “Thermistor short for cooking” with the symptom “No heat in 10 seconds after cooking starts.”
Because Kenmore-branded microwaves were built by different original equipment manufacturers, the exact meaning can vary by model platform. On Whirlpool-built Kenmore microwaves, the same F2 code may instead point to a keypad or user interface problem and associated wiring rather than the sensor. You need to identify the underlying manufacturer from your model number prefix before choosing the correct repair path.
Common Causes
- Shorted or out-of-range thermistor The temperature sensor in the microwave cavity or airflow path has failed or is reading resistance values outside the acceptable range, causing the control to flag a fault.
- Loose, damaged, or corroded sensor harness Broken insulation, loose spade connectors, pinched wires, or corrosion at the thermistor plug cause the control to read a false short or open circuit.
- Control board sensor input circuit failure The sensor input circuit on the electronic control board is damaged or not correctly interpreting the signal from an otherwise good sensor.
- Keypad or user interface fault (Whirlpool-built models) On Whirlpool platform Kenmore microwaves, F2 points to the keypad assembly or its wiring rather than the thermistor.
Step-by-Step Fix
- {‘step’: ‘Identify the actual OEM from the full Kenmore model number before choosing the fault tree, because Kenmore reused codes across different manufacturers and platforms.’}
- {‘step’: ‘Unplug the microwave and disconnect power at the breaker for at least one minute, then restore power and check whether the F2 code returns or clears after reset.’}
- {‘step’: ‘Access and inspect the thermistor and its wiring harness for loose spade terminals, broken wire insulation, heat damage, corrosion, or pinched wiring at connector points.’}
- {‘step’: ‘Measure the sensor resistance with the unit unplugged using an ohmmeter and compare the reading to the resistance chart for your exact model (typically found in the service manual or manufacturer documentation).’}
- {‘step’: ‘Replace the thermistor if the resistance is shorted, open, or far outside the specified range for your model.’}
- {‘step’: ‘Test the control board sensor input circuit if the sensor and wiring check good, and replace the control board if it is not correctly interpreting the sensor signal.’}
- {‘step’: ‘Inspect or replace the keypad or user interface assembly and its harness if your model is Whirlpool-built and the code points to the UI rather than the thermistor.’}
Parts Often Needed
| Part | Notes |
|---|---|
| Microwave thermistor / temperature sensor | Amazon | Match to your exact Kenmore model number and OEM platform. |
| Microwave electronic control board | Amazon | Required if sensor input circuit is damaged or misreads good sensor. |
| Microwave keypad / user interface assembly | Amazon | For Whirlpool-built Kenmore models where F2 indicates UI fault. |
| Sensor wiring harness or connector kit | Amazon | If harness shows heat damage, corrosion, or broken insulation. |
When to Call a Pro
Call a professional if you are not comfortable working with high-voltage microwave components or if you cannot positively identify your microwave’s OEM platform from the model number. If the error returns after sensor replacement and all wiring checks good, the fault is likely in the control board sensor input circuit or in component-level board repair that requires diagnostic equipment and microwave-specific training. Microwave repairs involve lethal capacitor voltages even when unplugged, so if you are unsure at any step, stop and call a qualified appliance technician.