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I'm new to this forum and not sure if my last post " posted " I've got a problem with a potterton boiler the central heating engineer who I've used before says my problem could be one of many things and trial and error it's a potterton performa 24 the hot water is fine but there's no heating...

Hi guys I have a potterton performa 24 boiler which is firing up for hot water but not for heating I've noticed the pin which operates the micro switch is permanently out . I've since found out that it operates the diverter valve .. My question is .. Is that the obvious problem or could it be...