E20
JCB
Earth Fault / Ground Fault Protection Trip
E20 displayed; controller indicates earth fault / ground fault on generator output.
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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
Insulation breakdown in cables, Moisture ingress in junction boxes, Faulty load equipment to earth, Incorrect neutral‑earth bonding
How to Fix / Troubleshooting
Safety: Earth faults can present shock and fire hazards. Isolate generator and loads before testing.
- Inspect cables: Check generator output cables and terminations for damage, water ingress, or burnt insulation.
- Megger test: Use an insulation resistance tester between each phase and earth to identify low resistance paths. Only qualified electricians should perform this test.
- Isolate loads: Disconnect suspect loads one by one to see when the earth fault indication clears.
- Check bonding: Verify that neutral‑earth bonding is configured correctly for the JCB generator and site installation.
- Repair or replace: Replace damaged cables or faulty equipment causing the earth fault before resetting E20.
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Repair Difficulty
Professional Required
5/5
Required Part
Output Power Cables
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