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oldplumber
I attended a 105e combi a while back, fan starts and fails to run going to lock out so replaced aps, all went swimmingly and left. 2 weeks later same problem, aps funtioning now (wasnt before, I checked switching etc) so saw the flue venturi was a bit dirty outside it and popped a spare in and changed the silicone tubes. All running ok, but Im thinking the pcb may be at fault giving an intermittent problem, anyone else come across this before, a first for me as if the pcb goes its normally a complete failure straight way. cheers