GROUND FAULT
Guardian
Ground Fault on Output Circuit
Controller shows GROUND FAULT or GFI TRIP; generator may shut down or open breaker.
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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
Moisture intrusion in wiring or loads, Damaged insulation on output cables, Faulty connected appliance, Defective GFCI breaker (if equipped)
How to Fix / Troubleshooting
Safety first: Open the generator main breaker and house breakers. Place the controller in OFF. Do not re-energize a suspected ground-faulted circuit without inspection.
- Inspect for moisture: Check the generator output lugs, conduit, and transfer switch for water, condensation, or corrosion. Dry and seal entry points as needed.
- Isolate circuits: Turn off all branch breakers, then restart the generator and energize circuits one at a time to identify which circuit causes the ground fault.
- Check wiring and loads: On the problem circuit, inspect receptacles, cords, and appliances for damage or water exposure. Repair or replace as needed.
- Test GFCI device: If equipped with a GFCI breaker, test and reset it. Replace if it will not reset with all loads disconnected.
- Professional testing: Persistent ground faults require insulation resistance testing by an electrician.
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Repair Difficulty
Hard
4/5
Required Part
GFCI / Ground Fault Breaker
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