While you wait for answers, we may have found some information which could help you.
Installation instructions for Ferroli 30800009?
Parts for ferroli optimax he 31c ?
i have a ferroli combi boiler i have 1/2 the radiators working and 1/2 not ?
Ferroli Optimax HE 31 C, how do I put water pressure up?
Ferroli domicondens he26 C fires up but doesn't appear to rectify ?
Ferroli DOMIcompact F 30 D?
How can I get my ferroli boiler to work?
I have a Ferroli FF 77 the pilot light has gone out will not stay on ?