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ravenheat white star clicking,intermitent stop start on hw and heating?

usualy fires up fine then cuts out on both systems.pump still runs then fires again lots of clicking noises then eventually runs fine. central heating seems to shut off b4 top temperature but does eventually gets there..hot water same and eventually stabalises
suzukiman, December 2010
Main suspect would be the fan (air) pressure switch

Carefree, December 2010
link Click here to see other fixes for Ravenheat.