Rheem
Heat Pump Coil Icing / Defrost Problem
Heat pump pool heater runs but forms excessive ice on the outdoor coil
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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 refrigerant charge, Defective defrost sensor, Restricted airflow through coil, Low ambient humidity and temperature combination
How to Fix / Troubleshooting
Safety First: Turn off power before touching the coil or fan.
- Inspect coil and airflow: Ensure the outdoor coil is clean and free of debris. Verify that shrubs or structures are not blocking airflow.
- Check fan operation: Confirm the fan runs at full speed and blows strongly. Replace fan motor or capacitor if weak.
- Allow defrost cycle: Many units periodically defrost. If ice does not melt during defrost, the defrost sensor or control may be faulty.
- Professional refrigerant check: Have a certified technician check refrigerant charge and defrost controls.
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Repair Difficulty
Professional Required
5/5
Required Part
Defrost Sensor / Outdoor Coil
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