Poolex pool heater shows FC and does not heat; may still power on.
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.
Possible Causes
How to Fix / Troubleshooting
Safety: This fault involves high current and mains voltage. Turn off power at the breaker and do not repeatedly reset the unit.
Basic checks:
- Verify supply voltage: Ensure the Poolex heater is connected to the correct voltage and phase as per the nameplate. Undervoltage or phase loss can trigger FC.
- Check wiring: Inspect the power supply terminals and internal power wiring for loose screws, discoloration, or burning.
Technician actions:
- Measure compressor winding resistance and insulation.
- Check starting current and operation of any Poolex soft-starter module or inverter board.
- Replace the compressor contactor or inverter PCB if found defective.
Due to the risk of electric shock and fire, FC faults should be handled by a qualified electrician or HVAC technician.
Repair Difficulty
Required Part
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