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our biasi(2001 make)combi boiler,goes on and off?

The boiler goes on and off,when it goes off there is a pulsing noise from a motor within the system,it pulses for about 10 mins,comes on for about a munite to two then goes off again,there is no gas leakage as it was checked recently
Frederick, October 2009
sounds like a faulty pcb

Ian, October 2009
link Click here to see other fixes for Biasi 2001.