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ravenheat 820/20 combi boiler ?

When I run the hot water tap, the water is cold, the pilot light doesn't start up, but when I put the central heating/water switch on, then it works okay.

Is is the micro switch?
darran mansbridge, March 2006
change the diaphram in the 3-way valve

dave, September 2006
link Click here to see other fixes for Ravenheat.