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Glowworm Micron 80FF boiler fault finding

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My boiler has stopped working completely and does not respond to turning the reset knob. A new thermistor was fitted 3 months ago and the resistance is still within specification. Mains voltage is present at the terminal block and the reset light illuminates. However, I can not detect mains voltage between the normally closed terminal of the air pressure switch and the neutral terminal on the terminal block, which has been my next check. Can anyone tell me if there could be another explanation for this defect other than a faulty PCB?

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Sorry we can't comment on "gas work" what this counts as. You need a Registered Gas Safe person

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