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Drayton MA1 - but I don't think it has anything to do with the MV because the boiler is getting mains on the 'Call Heat' but it just isn't lighting.

I have a strange fault with my daughter's central heating that has been coming and going for over a year. Before I go changing expensive items like the boiler PCB I wondered if any of the experts on this forum would have any insight to the possible problem. It is a standard sealed Y plan...