Do I ?
You're a real jack of all trades you are joe.
I've analyzed the problem and come to the conclusion it is the *************.
.
Pity you paid him. I'd suggest that if he does come back and fix the problem, whatever it actually is, you stand right by him and tell him to replace the old fan after the fix. If the boiler works in spite of the old fan being in place then you are within your rights to tell him to go and screw himselfIt seems that many believe that it could have been the fan, fine if that had been the case. I paid for his mis-diagnosis though. He won't take the fan back as apparently that's part of the problem.
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