We may have found other answers which could help you.
Click here for Boiler Losing PressureConnections on Ferroli F24 Gas Valve?
How can i repair a noCN fault on my boiler?
Ferroli Optimax HE31c a26 problem?
Ferroli DOMIcompact F 30 D?
F40 fault?
Ferroli domicondens he26 C fires up but doesn't appear to rectify ?