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water going hot then cold?

vaillant combi boiler 824/2e ,,heating is fine,hot water red hot then goes cold had new heat exchanger,plus new discaler on cold water ,any solutions to this problem would be welcomed.thanks .
AUDREY, September 2012
Hot water heat exchanger is blocked one look like sad in can,take it out and clean with acid

ltd, September 2012
link Click here to see other fixes for Vaillant.