Controller shows E10, generator will not start automatically on power outage

Safety first: Turn OFF all power sources. Open the utility main breaker and generator main breaker. Verify with a meter that no live voltage is present before touching wiring.

• Inspect sensing connections: Locate the utility sensing terminals on the Honda generator controller (often labeled L1, L2, N or similar). Ensure all wires are tight and not corroded or broken.
• Check fuses: Look for small control fuses protecting the sensing circuits on the controller PCB. Replace any blown fuses with the exact same rating after checking for shorts.
• Verify transfer switch wiring: At the automatic transfer switch, confirm that the utility lines are correctly landed on the designated terminals and that the sensing leads (if separate) are properly connected per the Honda wiring diagram.
• Test sensing voltage: With utility power restored and using a multimeter, verify that the correct line voltage is present at the controller sensing terminals. If voltage is present but E10 remains, the controller's sensing circuit may be defective.
• Controller replacement: If wiring and fuses are correct and E10 persists, the control PCB may need replacement by a qualified service technician.