Fault Codes/Generac/504Generac504UnclassifiedGeneralWhat This Code MeansConfiguration MismatchPossible Causes•Voltage configuration set in controller does not match voltage configuration for installed Voltage Configuration Cartridge (VCC).Related Generac Fault Codes505505-J4503506502100050110055001006000325A2100Browse all Generac fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 504 on your specific Generac unit — cited to the OEM manual, not a forum guess.TRY IT FREE