Generator starts and runs but produces no AC power at the output terminals; controller shows normal run status with no codes.

Safety first: Confirm the generator is isolated from the building and utility. Lock out the main breaker before opening covers.

• Check main breaker: Verify the generator main breaker is in the ON position and not tripped. Reset if necessary. If it will not reset, replace the breaker.
• Measure voltage at alternator: With the generator running, carefully measure voltage at the alternator output terminals. If zero, suspect excitation issues.
• Inspect AVR and wiring: Remove the alternator cover and inspect the AVR and field wiring for burns or loose connections. Tighten terminals and replace damaged wires.
• Field flashing (advanced): Some alternators may require field flashing if they have lost residual magnetism. This should be done only by a qualified technician following Kubota procedures.
• Replace AVR: If all wiring is intact and there is still no output, replace the AVR with the correct Kubota-specified part.