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vaillant vcw gb 242 eb boiler water content does not stay filled?

vaillant vcw gb 242 eb boiler water content does not stay filled and keeps requiring regular top up every couple of hours?

martin
January 2011
VaillantHeating, Home Heating SystemsBoiler Water Filled
Look for a water leak on the boiler/system

Carefree
January 2011

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Vaillant vcw gb242 eh central heating problem?
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how do I rectify the fault as detailed below?

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Vaillant ecoTEC 831 Plus

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