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no hot water?

I have a ravenheat combi boiler and am unable to get any hot water until I turn the heating on? what is possibly wrong with it?
simon, December 2008
your three way valve isn't changing over to heat the hot water, if when you call for hotwater your heating pipes get warm then this is the cause.

sj, December 2008
link Click here to see other fixes for Ravenheat.