We may have found other answers which could help you.
Click here for Combi Boiler Readferroli plus 31c has a code b2 any ideas?
Ferroli domicondens he26 C fires up but doesn't appear to rectify ?
Ferroli Optimax HE31c a26 problem?
How can i repair a noCN fault on my boiler?
Connections on Ferroli F24 Gas Valve?
Ferroli DOMIcompact F 30 D?