Controller shows E15, generator will not start, often after a lightning storm or power surge

Safety first: Disconnect utility and generator power. Remove battery negative before opening the control panel.

• Inspect internal harnesses: Open the controller enclosure and gently press all multi-pin connectors into place. Look for any burnt or discolored components on the PCB.
• Disconnect peripherals: If the controller uses a communication bus to external modules (e.g., remote display, network module), disconnect these one at a time and attempt to power the controller to see if E15 clears.
• Check for moisture: Look for signs of water ingress or condensation inside the control panel. Dry thoroughly and correct any enclosure sealing issues.
• Controller reset: Some Honda controllers allow a factory reset via menu or jumper. Follow the service manual procedure if available.
• Replace controller if needed: If E15 persists with all peripherals disconnected and wiring verified, the controller PCB is likely damaged and must be replaced and programmed by a Honda-authorized technician.