E8
Poolex Power Supply / Voltage Error

Poolex pool heater intermittently shows E8 and stops; may be related to power quality.

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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

Supply voltage outside Poolex specification, Loose supply terminals, Undersized wiring causing voltage drop, Internal power supply fault on main PCB

How to Fix / Troubleshooting

Safety: Work on mains wiring only if you are qualified. Always isolate power first.

Steps:

  • Measure voltage: Have an electrician measure voltage at the Poolex terminals while the unit is running. Compare with the nameplate range.
  • Tighten connections: Check and tighten all supply and earth terminals.
  • Check cable size: Ensure the supply cable cross-section meets Poolex installation requirements for the run length.

If voltage is stable and within range but E8 persists, the internal low-voltage power supply on the main PCB may be defective and require board replacement.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board Power Supply Section
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