Over-current fault.No primary lfb.Faulty output diode(s) D1 or D2.Faulty boost inductor L3.Faulty HD1.Open connection between HD1 and PC13.Faulty PC13.Faulty PC2 (239001 or 245857)Check CT1 and wiring for an open condition.Check for shorts or opens in wiring.Replace boost inductor L3 if necessary.Replace HD1 if necessary.Inspect all wiring and connections.Replace PC13.Replace PC2.