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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
Can you let us know what model boiler this is

gary.wright53@googlemail.com, June 2007
link Click here to see other fixes for Vaillant.