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why does hot water come on when heating is on?

my hot water only comes on when i put my hcentral heating is on and also one of my bedroom radiator heatr does not work at all?my boilers name is vaillant supposed to be one of the best if i can get someone who can repair or service the whole system at a reasoneable amount please do suggest

nasira
January 2010
VaillantHeating, Home Heating SystemsHot Water Come Heating
sounds like the diaphragm or flow switch is faulty not allowing the h/w to work independently. as for the radiator try bleeding it and make sure both valves are open

Ian
January 2010

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