Kenmore Dryer F04 Error — Inlet Temperature Sensor Failure
The F04 error code signals a failure of the inlet thermistor, which monitors incoming air temperature before it enters the drum. While F03 monitors exit air, F04 monitors the heat before it reaches your laundry — both are critical for safe, efficient drying.
Causes
- Heat stress on the thermistor from prolonged high-heat operation
- Disconnected or corroded wiring harness
- Thermistor physically damaged by lint buildup causing heat concentration
Lint Management is Critical
Excessive lint buildup around the heating element and thermistors is a fire hazard and accelerates component failure. Clean the lint screen after every load. Have the dryer vent duct professionally cleaned annually — a clogged vent is the leading cause of thermistor and thermal fuse failures.
Professional Service
Our technicians test both inlet and outlet thermistors together and inspect the heating element, thermal fuse, and vent path during every dryer service call for comprehensive safety.