While you wait for answers, we may have found some information which could help you.
Click here for Ferroli Boiler Waterferroli plus 31c has a code b2 any ideas?
Replace a diverter valve?
Hi how to increase the water pressure on ferroli optimax 25C?
F40 fault?
Ferolli Optimax HE 31C expansion vessel change?
i have a ferroli combi boiler i have 1/2 the radiators working and 1/2 not ?