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boiler heating up all the time?

i have a ravenheat condensing fanned combi csi85-csi85t it as just started to heat the water all the time in both the radiators and the hot water and the only way to stop it is to turn it off on the rest nob any one got any idea why cheers
matt, September 2007
Check out the diverter valve, mine's the same!!

John

John Driver, October 2007
micro switch sorted

matt, September 2007
link Click here to see other fixes for Ravenheat.