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vaillant 242e?

i have a vaillant 242e combi boiler the hot water only works if the hot water & heating switch light is on, what's my problem, can anybody help please? Hot water light doesnt come on at all.
cos, July 2009
Sounds like the dhw diaphragm needs replaced.

Ian, July 2009
link Click here to see other fixes for Vaillant.