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Hot water only when radiators are being heated?

I have a combi boiler which only now heats water when the room thermostat is under the set temperature and is therefore providing heat to the radiators. It used to be ok, does anyone have any ideas as to what could be wrong.

Kevin Noakes
January 2005
Heating, Home Heating SystemsHot Boiler Heats Thermostat
change over valve

timmo
March 2006

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