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Ravenheat combi boiler. How can I have hot water without heating on?

I have a Ravenheat RSF 84ET combi boiler about 4 or 5 years old. Hot water is only available when the heating is on. So if I want to have a hot shower the heating has to be on. Expensive and uncomfortable in this weather!

I am a competent mechanical engineer.
Tony Stirling, July 2008
I have on mine - and diaphram - no joy

jon hinch, January 2009
Have you with changed both CH and DHW wet pocket thermistors?

Chris, August 2008
link Click here to see other fixes for Ravenheat.