Bionaire
Evaporator Coil Icing
Dehumidifier coils freeze into a solid block of ice 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
Low ambient temperature, Restricted airflow due to dirty filter or coils, Low refrigerant charge, Faulty defrost sensor or control
How to Fix / Troubleshooting
Safety: Unplug the unit before defrosting. Do not chip ice with sharp tools; this can puncture the coil.
Steps:
- Defrost: Turn the unit off and allow all ice to melt completely. Place towels under the unit to catch water.
- Clean filter and coils: Wash the air filter and vacuum the evaporator and condenser coils.
- Check room temperature: Ensure the unit is used in a room above the minimum operating temperature (usually 5°C / 41°F).
- Inspect defrost sensor: Verify the evaporator/defrost sensor is properly attached to the coil and functioning (see E3/E7 procedures).
- Professional service: If icing recurs despite good airflow and proper temperature, the sealed system may be undercharged or the compressor may be weak; contact a refrigeration technician.
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Repair Difficulty
Hard
4/5
Required Part
Evaporator Temperature Sensor (NTC)
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