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How can I fix my Vaillant ecomax 828/2 E presure loss?

Have just purchased a flat with a Vaillant ecomax 828/2 E boiler and under floor heating. My problem is that the presure drops over a couple of days and brings up an F25 fault code. The system is about 5 years old. Any advice please.

Rob
December 2010
VaillantHeating, Home Heating SystemsVaillant Ecomax E

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