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my glow worm 30cxi the hot water keep going hot and clod?

my hot water on my glow worn 30cxi keeps going hot and cold
david, April 2013
change hot water NTC may be hot water ex changer is blocked replace or clean with spirit of salt,may engineer to do that,shout cold supply to boiler plus drain doen system

ltd, April 2013
link Click here to see other fixes for Glow-worm 30CXI.