Poolex Hydraulic Interlock / Pump Control Issue

Poolex pool heater runs but pool pump stops, causing the heater to shut down abruptly.

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

Incorrect wiring between Poolex pump relay and circulation pump, Pump timer not synchronized with heater, Faulty Poolex pump control relay

Safety: Turn off power to both pump and heater before working on control wiring.

Steps:

Check timers: Ensure the pool pump timer schedule covers the entire period when the Poolex heater is allowed to run.
Verify interlock wiring: If the heater is wired to control the pump, confirm wiring matches the Poolex installation diagram.
Test pump relay: Listen for a click from the heater when it calls for heat. If absent, the Poolex pump relay may be faulty.

Have an electrician correct wiring or replace the pump relay if needed.

Medium 3/5

Pump Control Relay

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