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my worcester 24i combi boiler will only heat in spurts?

my worcester 24i doesnt always heat the water up. sometimes it works and sometimes it doesnt - can you help?
bernie rice, August 2007
sounds like domestic hot water heat exchanger may be scaled up . if water runs hot and cold on long draw off this could be the problem.you can sometimes descale but this is usually a sign of a dirty system

zola, August 2007
link Click here to see other fixes for Worcester 24i.