Measurement:

The information provided indicates that the air pressure switch is faulty.
A known fault with this range of boilers is that after boiler ignition the fan slows or stops due to a faulty winding on the fan or an internal relay on the PCB.
If the air pressure switch shows signs of melting it is strongly recommended you continue fault finding instead of only replacing the air pressure switch.
Please select from the options below if you wish to investigate further or you just wish to change the air pressure switch.
APS damaged/melted further investigation (strongly recommended).

APS worn no further investigation.