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please explain the function of the air pressure switch - obviously it allows the fan to start so does not rely on pressure to run the fan but it changes state when it detects the fan running - is this correct? it then switches the fan off - yes?

Does anyone have a circuit diagram for the PCB in an Ultimate 60FF. I know the board is faulty and could buy a new one for £130 but the fault will probably be a single component and none of the components on this board would cost more than a few pence. Thanks

Can someone tell me the sequence of operation of a boiler? The fan starts and then turns off as the pressure switch changes state - I presume that the pressure switch detects that the fan is running? Does the supply to the fan then come from another source? According to the manual the PCB is...