While you wait for answers, we may have found some information which could help you.
Click here for Boiler Heating Repair
Hi how to increase the water pressure on ferroli optimax 25C?
Ferroli Optimax HE31c a26 problem?
Ferroli DOMIcompact F 30 D?
ferroli plus 31c has a code b2 any ideas?
How can i repair a noCN fault on my boiler?
Replace a diverter valve?