We may have found other answers which could help you.
Click here for Optimax Hello BoilerHi how to increase the water pressure on ferroli optimax 25C?
Ferroli domicondens he26 C fires up but doesn't appear to rectify ?
F40 fault?
Connections on Ferroli F24 Gas Valve?
Ferroli DOMIcompact F 30 D?
ferroli plus 31c has a code b2 any ideas?