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Can only get hot water when heating is on?? ?

I have a vokera comb boiler and can only get hot water when i put my heating on. If my heating is not on it runs cold. Any ideas? I have changed the diaphram but still having the same problem.
C Scott, December 2008
Change the d**n thing!!!

fi, December 2008
link Click here to see other fixes for Vokera comb boiler.