Controller displays E6 and prevents the generator from starting

Safety first: Ensure the generator cannot start unexpectedly. Set the controller to OFF and open the main AC breaker.

• Measure battery voltage: With a multimeter, check the 12V battery at rest. Below ~12.0 V indicates a discharged or failing battery. Charge the battery fully and retest. If it will not hold above 12.4 V after charging, replace it with a battery meeting Westinghouse specifications (CCA rating and size).
• Inspect terminals: Clean any corrosion from battery posts and cable clamps using a baking soda solution and a wire brush. Tighten connections securely.
• Check battery charger: With AC utility power present, measure voltage at the battery terminals; it should be around 13.2–13.6 VDC if the onboard charger is working. If voltage does not rise when utility power is on, the charger module or its fuse may have failed.
• Inspect charger wiring and fuse: Locate the DC charger output leads and any inline fuse. Replace blown fuses only with the specified rating. Check for loose or damaged wiring.
• Clear code and test: After correcting issues, clear E6 by cycling the controller OFF then to AUTO. Perform a test start to confirm reliable cranking.

If the battery and wiring are good but E6 recurs, the integrated battery charger or control board may need replacement by a technician.