E09
Hewalex
Defrost Sensor / Coil Frost Protection Fault
Hewalex pool heater shows E09 and will not run the compressor.
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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
Defective defrost temperature sensor, Sensor not in contact with coil, Wiring fault between sensor and PCB, Control board misreading sensor
How to Fix / Troubleshooting
Safety first: Turn off power before accessing internal components.
- Identify defrost sensor: On many Hewalex models, the defrost sensor is another NTC attached to the evaporator coil or suction line.
- Check placement: Confirm the sensor is properly strapped or clipped to the pipe/coil where specified in the service manual.
- Inspect wiring: Follow the cable back to the PCB, checking for pinched or rubbed-through insulation.
- Reconnect and test: Reseat the connector and restore power. If E09 persists, the sensor or PCB may be defective.
- Professional diagnosis: A technician can compare sensor readings via service mode and determine whether the sensor or control board needs replacement.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Temperature Sensor
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