The 1F error code on a Kenmore refrigerator indicates a fault with the freezer temperature sensor (thermistor). The refrigerator’s control board monitors freezer temperature to maintain food safety. When the freezer thermistor fails or reads outside its expected range, the control board displays the 1F error and may alter cooling behavior.
Causes of the 1F Error
- Failed freezer thermistor (open or short circuit)
- Wiring fault in the thermistor harness
- Control board misinterpreting thermistor data
- Extreme ice buildup around the thermistor sensor
Troubleshooting
- Manually defrost the freezer if there is excessive ice buildup (unplug refrigerator, leave doors open for 24–48 hours with towels to catch melt water).
- After defrost, plug in and allow to cool completely. If 1F returns, the thermistor requires replacement.
- Do not ignore this error — an inaccurate freezer temperature sensor means food may not be kept at safe temperatures.
Our technicians carry freezer thermistors for all major Kenmore refrigerator models and can complete this repair in under an hour.