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how can i fix my vaillant combi boiler?

my vaillant vcw boiler has a leak on the top of a black box located on the left of the boiler does anyone know how to fix this is it just a seal and what is this black box type part called. thanx.

mel
March 2005
VaillantHeating, Home Heating SystemsVaillant Combi Boiler
Replacement Domestic Hot Water Vessel required.
Not repairable.

R
July 2005

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