JCB Fail to Stop / Shutdown Circuit Fault

Generator fails to stop when commanded by the controller; engine continues running.

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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

Fuel solenoid stuck open, Stop relay failure, Broken stop cable (mechanical stop), Controller output fault

How to Fix / Troubleshooting

Safety: Be prepared to use the emergency stop if normal stop fails. Keep clear of moving parts.

  • Use manual stop: Operate the emergency stop button or manual stop lever on the JCB engine to shut down.
  • Check fuel solenoid: Verify that the fuel shutoff solenoid de‑energizes when stop is commanded. If it remains energized, test the stop relay and controller output.
  • Mechanical linkage: For mechanically stopped engines, inspect the stop cable and lever for free movement and correct adjustment.
  • Replace faulty components: Replace a sticking fuel solenoid or defective stop relay as needed.
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Repair Difficulty

Medium 3/5

Required Part

Fuel Shutoff Solenoid
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