Controller displays “Ground Fault” or “Earth Fault”; generator may trip off-line.

Safety first: Turn generator OFF, open main breaker, and lock out the transfer switch. Use appropriate PPE when testing.

• Isolate loads: Disconnect or turn off branch circuits one by one to identify which circuit causes the ground fault to reappear when re-energized.
• Inspect wiring: On the suspect circuit, inspect outlets, junction boxes, and appliance cords for water, corrosion, or damaged insulation.
• Dry and repair: Dry any moisture, replace damaged wiring or devices, and ensure proper bonding and grounding.
• Sensor check: Inspect the ground fault sensor and its wiring in the generator control box for damage or loose connections.

Persistent ground faults or nuisance trips may require insulation resistance testing (megger) by a qualified electrician.