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Mend Ferroli Optima 701 Heating Pcb

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
FerroliFerroli Optima 701Heating, Home Heating SystemsFerroli Heating Pcb
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

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