Hurlcon Control Instability / Faulty Sensor or Relay

Pump starts and stops rapidly (short cycling) without user input.

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

Sticking relay on Hurlcon control PCB, Faulty flow or pressure sensor, Loose control wiring, Oversensitive thermal protection

Safety: Repeated cycling can damage the motor; turn off power until diagnosed.

Check sensors: Inspect and clean any flow or pressure sensors connected to the controller.
Inspect wiring: Ensure all low-voltage control wires are secure and not shorting.
Bypass automation: Disconnect external automation and run the pump directly from the Hurlcon controller to isolate the cause.

Persistent short cycling usually requires controller or sensor replacement by a technician.

Hard 4/5

Hurlcon pump control PCB or flow/pressure sensor

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