How to mend Ferroli 0003l60754

How do i get the water pressure up please?

Ferolli Optimax HE 31C expansion vessel change?

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Ferroli Boiler Optimax HE 31C?

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Ferroli Optimax HE 31 C, how do I put water pressure up?

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Replace a diverter valve?

Hi how to increase the water pressure on ferroli optimax 25C?