E17
Sun Country Highway
External Control / Demand Response Input Fault
Display shows E17; charger may not start or may stop unexpectedly when using load management or network features.
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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
Shorted or open external control input wiring, Incorrectly wired load management contacts, Faulty external relay or controller, Control board input circuit failure
How to Fix / Troubleshooting
Safety first: De-energize the charger and any connected control wiring before servicing.
- Review wiring diagram: Confirm that any external control or demand response wiring to the Sun Country Highway charger matches the manufacturer’s diagram.
- Isolate external control: Temporarily disconnect external control wires at the EVSE terminal block and insulate them. Restore power and see if E17 clears. If it does, the issue is external.
- Check external devices: Inspect any building automation relays, timers, or load controllers for shorts or stuck contacts.
- Board input check: If E17 persists with all external wiring removed, the control board’s external input circuit may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
External Control Input Terminal Block
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