Controller displays E0, generator will not start in AUTO or MANUAL mode

Safety first: Standby generators can start automatically. Before working on the unit, set the controller to OFF, open the main AC breaker on the generator, and disconnect the battery negative cable. If you are not comfortable with electrical work, contact a licensed technician.

• Check controller mode: Verify the Champion controller is not in OFF or SETUP mode. Place it in AUTO or MANUAL and see if E0 clears.
• Confirm battery connection: Open the generator enclosure and verify the battery disconnect switch (if equipped) is in the ON position and the battery cables are tight and free of corrosion.
• Inspect control harness: Check the multi-pin wiring harness at the back of the controller for a secure connection. Reseat the connector if it appears loose.
• Controller reset: With battery connected and main breaker still OFF, press the controller reset/escape button (if provided) or cycle power to the controller by disconnecting and reconnecting the battery negative cable after 30 seconds.
• Configuration: If the unit is newly installed, follow the Champion installation manual to complete initial setup (date/time, exercise schedule, voltage/frequency settings). E0 may clear once configuration is complete.

If E0 persists after these checks, the controller may require firmware update or replacement by an authorized Champion service dealer.