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Posted by blevy on May 11, 2004 at 06:28:21:
My Vaillant VC-GB-142EH has stopped heating the water supply (central heating still working) - the boiler doesn't light when CH switched off at the timer. I've established that the thermostat is working and I believe that the motor valve is OK. (Setting it to manual doesn't make a difference.) I see that similar problems on other types of boiler could be down to a worn out / broken diverter valve. Could it be the same on this one? Or any other ideas?