GE · Microwave error code

F4Humidity sensor fault

Cross-checked High-voltage / caution

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Related diagnostic guides

Guide · Microwave

Sensor cook / auto programs not working

Sensor programs depend on a humidity or vapor sensor and a correct load. Most failures are usage (tight covers, tiny loads, hot cavity) or grease on the sensor; a failed sensor or wiring shows a code.

6 steps ~30 minmoderate