While you wait for answers, we may have found some information which could help you.
Click here for Will Not Switch OffFerroli domicondens he26 C fires up but doesn't appear to rectify ?
F40 fault?
I have a Ferroli FF 77 the pilot light has gone out will not stay on ?
Ferroli Optimax HE31c a26 problem?
How can i repair a noCN fault on my boiler?
Ferroli DOMIcompact F 30 D?