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worcester highflow combi boiler not working?

the boiler lights are on and the pressure is ok but although it sounds like it is coming on there is no heat in the radiators or the hot water, nothing is flashing just looks and sounds as normal but no heat!
fbrown, October 2008
Check room stat is turned on
Possible that motor in motorized valve is broken

a, October 2008
link Click here to see other fixes for Worcester Highflow.