We may have found other answers which could help you.
Click here for Flashing Fault HeatHi how to increase the water pressure on ferroli optimax 25C?
How can i repair a noCN fault on my boiler?
Replace a diverter valve?
Parts for ferroli optimax he 31c ?
Ferroli domicondens he26 C fires up but doesn't appear to rectify ?
Ferroli DOMIcompact F 30 D?