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Mend Vaillant Hot Water Cold Flame

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
VaillantHeating, Home Heating SystemsHot Water Cold Flame
Can you let us know what model boiler this is

gary.wright53@googlemail.com
June 2007
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