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There is no power going to the Ignition Board at all on the Red wire. So I am thinking the other main PCB is at fault or Air Pressure Switch ? cheers jc

Ah ok thanks Tony do you know or recommend anyone could have a look at it ? Hackney East London cheers jc Yes it has 2 pcbs

Hi my Biasi boiler wont ignite, the Green light is pulsing 1 sec on on 1sec off the fan is going but it wont fire up. No hot water or heating. The fan is also going on and off with the pulses of the light or so it seems. Any ideas ? A friend suggested air pressure switch problem cheers jc