Panasonic
Evaporator Icing / Defrost Failure
Unit frequently forms thick ice on the evaporator coil and stops dehumidifying.
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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
Low room temperature, Restricted airflow, Faulty defrost sensor, Defective defrost control on PCB
How to Fix / Troubleshooting
Safety first: Unplug the unit and allow all ice to melt before working on it.
- Check room temperature: Ensure the room is within the specified operating range. Move the unit to a warmer area if necessary.
- Clean filter and coils: Remove dust and debris to restore airflow.
- Verify fan operation: A slow or non‑running fan will cause icing; replace the fan motor if needed.
- Test defrost sensor: Inspect and test the defrost thermistor; replace if readings are abnormal.
- PCB defrost control: If icing persists with a good sensor and airflow, the main PCB may not be initiating defrost properly and may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Defrost Thermistor / Indoor Fan Motor
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