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HEATING?

I have a Ravenheat combi boiler 820/20, when just on water and i run hot water tap its cold, but when on heating and water and i run the hot tap i get hot water, CAN ANYONE HELP!!!
Pamela DAY, January 2010
the microswitch or diaphragm that tell the boiler a tap has been opened have failed and need replacing

brian, January 2010
link Click here to see other fixes for Ravenheat.