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What does f.25 mean?

I have money in my meter but my vaillant boiler keeps saying f.25 the pressure is just above the first line what does this mean and what can i do to resolve it ?

Stacey, March 2017

home Fix label Heating label_important Home Heating Systems category Vaillantdone

Ring the boiler manufacturers technical helpline

Asbestos, April 2017

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home Fix label Heating label_important Home Heating Systems category Vaillant

What does f.25 mean?

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What does f.25 mean?

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What does f.25 mean?

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