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How to maintain water pressure for Vaillant combi boiler?

Hi,
Our Vaillant combi boiler loses pressure and stops working (or doesn't come on) at least once a week. We know how to refill and get the pressure right but is there anything we can do to maintain it? Is there one part that isn't working properly that needs replacing?
Thanks

Liz
December 2008

Vaillant Vaillant ecoTEC Heating, Home Heating Systems Boiler Heating Vaillant

Can you tell me how to refill and get the pressure right ?

V Rose
December 2008

is water leaking from a small copper pipe outside near the flue

b
December 2008

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Vaillant Boiler Losing Pressure - Fixes & Advice