As per title, I have searched for info with only partial success. Symptoms: machine switches on, fan operates and relay operates when torch trigger pulled but feed motor does not operate. Consulted Steve at Weldequip ( very helpful and brilliant mail order service ) and purchased new circuit board. Fitted new board and still same (non) result. Tested motor with 24 volts and it works fine. Inspection of other components shows no visible damage including what I take to be a fusible link. I am no electrician and am not keen on poking into things that could be at 240v but any suggestions on what to investigate next would be appreciated.