H23
Panasonic
Cavity Temperature Sensor Overheat / Fault
Microwave shows H23 and may not start or may stop during operation.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Overheated cavity due to blocked airflow, Failed temperature sensor, Faulty control PCB interpreting sensor data
How to Fix / Troubleshooting
Safety: Do not operate the microwave with blocked vents or damaged filters.
Actions:
- Unplug and cool: Disconnect power and allow the unit to cool completely.
- Inspect airflow: For over-the-range models, remove and clean the grease filters. Ensure the exhaust path is not blocked.
- Check installation: Confirm the microwave is not tightly enclosed without the clearances specified in the manual.
- Reset and test: After cooling and cleaning, plug in and run a short low-power test.
If H23 persists: A technician should test the cavity thermistor and control board.
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Repair Difficulty
Medium
3/5
Required Part
Cavity Thermistor (Temperature Sensor)
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