AquaCal
Excessive Defrost Cycling
Heater frequently goes into defrost and spends long periods not heating, even in mild weather.
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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
Defrost sensor out of calibration, Sensor not properly attached to coil, Control board defrost settings incorrect, Restricted airflow causing coil to run too cold
How to Fix / Troubleshooting
Safety first: Turn off power before accessing the coil or sensors.
- Inspect coil sensor: Ensure the defrost sensor is firmly clipped to the correct location on the evaporator coil per AquaCal instructions.
- Clean coil: Remove dirt and debris from the coil to improve heat transfer and reduce icing.
- Check clearances: Make sure nothing is blocking airflow around the unit.
- Replace sensor: If the unit still defrosts excessively, replace the defrost sensor. If the issue persists, the control board may need adjustment or replacement by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Defrost Sensor
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