AC output circuit not working. DC output working fine. My testing reveals that likely the generator main control board has a fault. I have confirmed that the stator for both A.C. and the D.C. circuits are working correctly. D.C. output also good, so rectifier ok as well. I did also check the three lights (oil, A.C. and overload) all good. Gas powered 4-stroke motor works perfectly. Good candidate for repair or for parts. See review here... https://powergeneratorexpert.com/yamaha-ef2000is-inverter-generator/