Poolex Compressor Start Failure

Poolex pool heater powers on but compressor never starts; only fan runs.

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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

Faulty compressor contactor, Failed Poolex inverter board (on inverter models), Open compressor thermal protector, Low ambient lockout conditions

How to Fix / Troubleshooting

Safety: High voltage present. Only attempt basic checks if you are competent; otherwise call a technician.

Steps:

  • Check temperature and mode: Ensure the setpoint is above current pool temperature and that the unit is in heating mode, not standby.
  • Listen for compressor: If you never hear the compressor start (no humming or vibration), the start circuit may be faulty.
  • Allow cool-down: If the unit has been cycling frequently, let it rest for 30 minutes and try again.

A technician should check the compressor contactor, inverter PCB, and compressor windings. Replace the Poolex compressor contactor or inverter board if defective.

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Repair Difficulty

Hard 4/5

Required Part

Compressor Contactor
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