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How can i fix my ferrolli 77ff combi?

having problems with a ferrolli 77ff.
Boiler will not start in hot water or heating mode, fan runs. have changed air pressure switch but will not go any further and diagnostic led will not light up to show air pressure switch is energised.
ken, March 2008
have the venturis been cleaned ..... and are the hoses 2 the switch from the fan in good condition and not split ??

matt the boiler man, March 2008
poss pcb problem i have found many of these burned out check for voltages at common on pressure switch and the NC on the switch

paul, March 2008