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my hot water is running cold ?

I have a combination boiler which fuels the hot water and the heating.
They both have individual switches to trigger thi pilot light,at the moment I believe the pilot light is not being triggered to heat the hot water the only way we can turn on is if heating has already ignited flame meaning to have hot water we must have heating on.
Please could anyone advice of the possible problem
Witward, July 2008
sound like the diverter valve inside the boiler has gone so when you run the tap it is not sensing the flow it needs a new diverter

paul, July 2008