How to mend Ferroli Optimax Hc 31 C

i have a ferroli combi boiler i have 1/2 the radiators working and 1/2 not ?

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F40 fault?

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boiler indicating f5 causing ?

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Ferroli Boiler Optimax HE 31C?

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

Replace a diverter valve?

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FF360 Reset Button Problem?

Ferolli Optimax HE 31C expansion vessel change?

Ferroli H31c no hot water or heating & no fault sign?

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

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

Ferroli Optimax HE31c a26 problem?

Over filled my Ferroli boiler?

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How turn off heating in Ferolli Optimax 31c?

Ferroli , Modena 102 Gas boiler?

How do i get the water pressure up please?

ferroli plus 31c has a code b2 any ideas?