Fault Codes/Generac/501Generac501UnclassifiedGeneralWhat This Code MeansConfiguration MismatchPossible Causes•Voltage configuration set in controller does not match voltage configuration for installed Voltage Configuration Cartridge (VCC).Related Generac Fault Codes502503500504000325A505134505-J41 SECOND FLASH (1 ON – 1 OFF)5060.01 0144331000Browse all Generac fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 501 on your specific Generac unit — cited to the OEM manual, not a forum guess.TRY IT FREE