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vaillant ecomax foult code f.25?

please help
can't get my boiler to work at all (vaillant ecomax i think it's 800 series)
keeps displaying foult f.25 which is not mentioned in the manual
anybody knows what to do?
i'm freezing

mark
November 2006

Vaillant Heating, Home Heating Systems Help Work 800

i just had the same problem with my boiler, topped up water to 1bar but now i have f.20, any ideas?

paul
November 2009

F.25 is the water switch. This usually means there is not enough pressure in the heating system. Top up the water to 1 bar and see if this works.

John
November 2006

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