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need help diagnosing?

have a ferroli optima 701,fan continually on low rate,will fire up,but fan remains on low rate,tried new fan,but still on low,pilot light seays on but when asking for demand,either heating or hot water no joy.gas valve or pcb fault?
chris, January 2011
checked and prooved air pressure switch,also,when you call for hot water,fan goes off!i thought it might be thet the pcb isnt sending signal for fan to go on to full rate,you agree?

chris, January 2011
check air presssure switch, venturi and pcb.

erj, January 2011
link Click here to see other fixes for Ferroli.