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Mend Vaillant VCW Boiler Leak

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

Vaillant Vaillant VCW Heating, Home Heating Systems Boiler Leak Vaillant

Replacement Domestic Hot Water Vessel required.
Not repairable.

R
July 2005

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Vaillant VCW Boiler Leak - Fix & Parts