How to mend Ferroli F24 B

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

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I have a Ferroli FF 77 the pilot light has gone out will not stay on ?

Parts for ferroli optimax he 31c ?

heating?

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Replace a diverter valve?

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Installation instructions for Ferroli 30800009?

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

I have a Ferroli domicondens he 26 c heating not working?

Ferroli domicondens he26 C fires up but doesn't appear to rectify ?

Heating coming on all times?

Ferroli Optimax HE31c a26 problem?

How do i get the water pressure up please?