Controller displays E8, generator shuts down and may show abnormal voltage readings

Safety first: Overvoltage can damage appliances. Immediately set the controller to OFF, open the generator main breaker, and disconnect the battery negative cable.

• Inspect sensing wires: Locate the small-gauge voltage sensing wires from the alternator to the controller/AVR. Ensure all connectors are tight and not corroded.
• Check neutral and ground connections: Verify that the neutral bus and ground connections inside the generator are tight and free of discoloration or overheating.
• Look for aftermarket modifications: Remove any non-Champion voltage boosters or add-on devices that may interfere with regulation.
• Replace AVR if necessary: If wiring is intact and E8 recurs, the AVR is likely defective. Follow the service manual to remove the alternator end cover, disconnect the AVR, and install a Champion-approved replacement.
• Verify output with meter: After repair, have a technician verify line-to-line and line-to-neutral voltages under load with a true-RMS meter before reconnecting to the home.

Do not operate the generator with known overvoltage conditions; this can destroy sensitive electronics in your home.