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no hot water from boiler?

my worcester combi 280 boiler is not supplying hot water if i run a hot tap it will supply hot water for a little while and then goes cold again
raybo, June 2011
hot water heat exchanger is blocked clean with acid, be care full acid can burn your skin.drain out system
and shut cold water suppy before you take it out

lal, June 2011
link Click here to see other fixes for Worcester.