E15 displayed and engine shuts down; controller indicates generator over‑current or short‑circuit.

Safety: High fault currents are dangerous. Ensure the generator breaker is open and the system is de‑energized before inspection.

• Check breaker status: Inspect the JCB generator main circuit breaker. If tripped, do not immediately reset without investigating the cause.
• Inspect load circuits: Check downstream panels and feeders for signs of damage, burnt insulation, or tripped sub‑breakers.
• Isolate loads: Disconnect or switch off major loads, then reset the generator breaker and start the set. Gradually reintroduce loads to identify the circuit causing the trip.
• Breaker settings: Verify that the breaker or electronic trip unit is set to the correct current rating for the generator.
• Contact a qualified electrician: If a short circuit is suspected in building wiring, have a licensed electrician locate and repair the fault.