E07
JCB
High AC Voltage / Over‑Voltage Protection
E07 displayed and generator output voltage is higher than normal or the controller trips immediately on start.
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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
AVR sensing failure, Incorrect AVR wiring, Defective AVR, Loose or broken voltage sensing leads
How to Fix / Troubleshooting
Safety: High voltage is dangerous. Isolate the generator from all loads and mains before inspection.
- Confirm over‑voltage: With the generator running at rated speed and isolated, measure line‑to‑line voltage. If significantly above nameplate, shut down immediately.
- Inspect AVR sensing circuit: In the alternator terminal box, locate the small gauge sensing wires going to the AVR. Ensure they are connected to the correct phases and are not broken or shorted.
- Check AVR configuration: Verify any jumpers or selector switches on the AVR are set for the correct voltage and phase configuration for the JCB alternator.
- Replace AVR if needed: If wiring is correct and voltage remains high, replace the AVR with the correct JCB‑approved part.
- Controller settings: Confirm the JCB controller over‑voltage trip level is set according to the generator specification and not too low.
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Repair Difficulty
Hard
4/5
Required Part
Automatic Voltage Regulator (AVR)
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