Controller shows E08 and the generator will not accept load; frequency reading is out of range.

Safety: Do not connect unstable frequency power to loads. Isolate from mains and critical equipment.

• Measure frequency: Use a frequency meter or multimeter with Hz function at the generator terminals. Confirm if frequency is low or high compared to the rated (e.g., 50 Hz or 60 Hz).
• Check engine speed: Inspect the mechanical governor linkage or electronic actuator on the JCB engine. Ensure there is no binding and that the speed adjustment screw has not been tampered with.
• Load test: If frequency drops only under load, reduce load and see if frequency recovers. Persistent droop may indicate governor wear or incorrect fuel setting.
• Inspect speed sensor: For electronic governors, check the speed sensor at the flywheel and its wiring to the governor module and controller.
• Adjust governor (qualified personnel): Fine‑tune the governor speed setting to achieve correct no‑load frequency, then verify under typical load. Follow JCB/engine manufacturer procedures.