How to mend Ferroli Fault Code Heating System

ferroli plus 31c has a code b2 any ideas?

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Ferroli Boiler Optimax HE 31C?

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Heating coming on all times?

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

boiler indicating f5 causing ?

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Replace a diverter valve?

Installation instructions for Ferroli 30800009?

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

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

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Parts for ferroli optimax he 31c ?

feroli optimax fault code a4 ?

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How do i get the water pressure up please?

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

F40 fault?

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