The F23 error code on a Kenmore dryer indicates a failure of the inlet thermistor — the temperature sensor that measures the air temperature entering the dryer drum from the heating element. This sensor is critical for preventing overheating and ensuring proper drying temperatures.
Causes
- Failed inlet thermistor (open or short circuit)
- Clogged vent causing abnormal temperatures that damage the sensor
- Wiring fault in the sensor circuit
Troubleshooting
- Inspect and clean the dryer vent — vent restriction is the primary cause of thermistor failure.
- Reset the dryer (unplug 5 minutes).
- If F23 persists, the inlet thermistor requires professional testing and replacement.
Don’t ignore this error — operating a dryer with a faulty thermistor creates an overheating risk and potential fire hazard. Schedule a professional repair promptly.