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No hot water from Ravenheat RSF82E combi boiler?

I can only get hot water if I switch the central heating on permanantly. Even if I just set the boiler for hot water only,it still doesn't work. The boiler is about 10 years old, is it worth repairing or just replace it? Thanks.
Mike the unclean!, May 2010
Possible cause of fault can be with DHW thermistor or diverter valve that would be cheaper than replacing the boiler, although combi boiler that over ten years old are normally on borrowed time before they require replacing.

Chris, May 2010
link Click here to see other fixes for Ravenheat.