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Boiler fires up ok on heating. On hot water, boiler starts to fire up and then switches off and the fan cyles like this for a period of time before eventually firing up ok. Would anybody be able to tell me what is causing this. Thx

The overheat reset on my valliant keeps kicking in. The heating works fine but as soon as I turn on hot tap the reset kicks in almost immediately, no hot water delivered at all. Had several plumbers come around and they all say 'could be this could be that, best to get a new boiler'. A...