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how cab I fix my ravenheat white star combi boiler c85 model?

when turning water on for warm water, gas does not ignite, but does ignite when turning on the central heating.
melvyn yates, March 2011
chances are its is either the hot water flow sensor sticking or the divertor valve sticking and not operating the microswitch.

NHS GASMAN, March 2011
link Click here to see other fixes for Ravenheat C85.