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Mend Vaillant 824/2e Water Going Hot

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
VaillantVaillant 824/2eHeating, Home Heating SystemsWater Going Hot
Hot water heat exchanger is blocked one look like sad in can,take it out and clean with acid

ltd
September 2012
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