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Hot water not work?

I have a Ravenheat RSF84ET combi boiler, the only way i can get hot water is to have the central heating on.I was told that it could be the thermal coupling,is this correct.
carl, August 2010
flow switch/diverter valve problem

STUBOW, August 2010
no

Carefree, August 2010
link Click here to see other fixes for Ravenheat.