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Why does the hot water go cold every now and again?

We have a Vaillant combi boiler and have recently found that the hot water suddenly goes very cold for no apparent reason - the flame is still lit and the pressure is ok. Any ideas?

Karen, June 2007

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Can you let us know what model boiler this is

gary.wright53@googlemail.com, June 2007

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home Fix label Heating label_important Home Heating Systems category Vaillant

Why does the hot water go cold every now and again?

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