Heat Siphon Communication / Control Signal Issue with Pool Automation

Automation system calls for heat but the Heat Siphon does not start.

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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

Incorrect wiring to fireman’s switch or remote terminals, Misconfigured automation heater type, Open external enable circuit

How to Fix / Troubleshooting

Safety first: Turn off power to both the heater and automation panel before adjusting low‑voltage wiring.

  • Verify wiring: Compare the wiring between the automation relay and the Heat Siphon remote/fireman’s switch terminals to the Heat Siphon and automation manuals.
  • Test local control: Temporarily disconnect automation wires and set the heater to local control with a high setpoint. If it runs, the issue is in the automation system or wiring.
  • Automation settings: In the automation menu, confirm the heater type is set to HEAT PUMP/HEAT SIPHON and that the water temperature setpoint is above current temperature.
  • Repair wiring or configuration: Correct any miswiring or programming errors. Replace damaged low‑voltage cable if needed.
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Repair Difficulty

Medium 3/5

Required Part

Remote Control Terminal Block
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