E17
SunHeater
External Thermostat / Remote Input Fault
Heater displays E17; occurs when using remote/automation control
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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 remote wiring, Shorted remote thermostat input, Incompatible automation signal, Misconfigured control mode
How to Fix / Troubleshooting
Safety: Turn off power before adjusting low-voltage wiring.
- Check control mode: On the SunHeater control panel, verify that the heater is set to the correct mode (e.g., Remote vs Local). If you are not using an external controller, set it to Local.
- Inspect remote wiring: At the low-voltage terminal strip, confirm that the remote thermostat or automation wires are landed on the correct terminals as per the SunHeater wiring diagram.
- Test for shorts: Disconnect the remote wires and see if E17 clears when operating in Local mode. If it does, the issue is in the external wiring or controller.
- Verify compatibility: Ensure your pool automation system is configured for a SunHeater-compatible heater control protocol (on/off, dry contact, or digital bus as specified).
- Replace input board if needed: If E17 persists even with no remote wiring connected, the Low-Voltage Input Board or main control may be faulty.
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Repair Difficulty
Medium
3/5
Required Part
Low-Voltage Input Board
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