SunHeater Control Integration / Interface Failure

Heater operates but external pool automation cannot turn it on or off

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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 terminals, Misconfigured automation output, Faulty low-voltage input board, Broken control cable

How to Fix / Troubleshooting

Safety: Turn off power before working on low-voltage terminals.

  • Verify wiring diagram: Consult the SunHeater manual and your automation manual to confirm correct connections to the heater's Remote/Fireman's Switch Terminals.
  • Test heater locally: Put the heater in Local mode and confirm it operates normally from its own controls.
  • Simulate call for heat: With power off, temporarily jumper the remote terminals on the heater. Restore power and see if the heater responds. If it does, the issue is in the external controller or wiring.
  • Check cable continuity: Test the control cable between the automation panel and heater for opens or shorts. Replace if damaged.
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Repair Difficulty

Medium 3/5

Required Part

Remote Interface Terminals
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