Fault Codes/Blue Star Power Systems/400Blue Star Power Systems400UnclassifiedGeneralWhat This Code MeansLoss of ExcitationRelated Blue Star Power Systems Fault CodesF4181U81O59(2)5951(2)514740Q3227(2)27Browse all Blue Star Power Systems fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 400 on your specific Blue Star Power Systems unit — cited to the OEM manual, not a forum guess.Your question about 400GET THE ANSWERFree account required — we'll bring your question with you.