Aprilaire
Evaporator Coil Icing
Aprilaire dehumidifier coils freeze up 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, Low refrigerant charge, Faulty coil temperature sensor, Fan speed too low
How to Fix / Troubleshooting
Safety first: Turn off and unplug the unit before defrosting or cleaning.
- Defrost coil: Allow the unit to sit off until all ice melts. Do not chip ice with sharp tools.
- Check ambient temperature: Ensure the space temperature is within the unit’s operating range. Move the unit or warm the space if necessary.
- Clean filter and coil: Clean or replace the air filter and vacuum dust from the evaporator coil.
- Verify fan operation: Confirm the blower runs at full speed. Replace the Aprilaire blower motor or capacitor if it is weak.
- Professional service: If icing recurs, have an HVAC technician check refrigerant charge and the coil temperature sensor.
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Repair Difficulty
Hard
4/5
Required Part
Aprilaire Coil Temperature Sensor
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