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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
VaillantHeating, Home Heating SystemsMoney Vaillant Boiler
Ring the boiler manufacturers technical helpline

Asbestos
April 2017

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