We may have found other answers which could help you.
Click here for Heating Times DayF40 fault?
Ferroli Optimax HE31c a26 problem?
Hi how to increase the water pressure on ferroli optimax 25C?
Replace a diverter valve?
Ferroli domicondens he26 C fires up but doesn't appear to rectify ?
Connections on Ferroli F24 Gas Valve?