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Why does my hot water not work?

I have a Worcester 28 Combi Boiler. The problem I am having is that it will only supply hot water to the taps when the heating is on. If the heating is off then I have no hot water. Any ideas as to the cause and how to fix it if possible.
Thanx
Phil, December 2008
It`s either the divertor valve stuck or the water section diapragm is perished.You need a Corgi engineer.

Gasman, December 2008
same problem here think you'll find its the turbine

Dan, December 2008
link Click here to see other fixes for Worcester.