While you wait for answers, we may have found some information which could help you.
Click here for Heating Thermistors Pressure
How can i repair a noCN fault on my boiler?
Ferroli Optimax HE31c a26 problem?
Replace a diverter valve?
F40 fault?
Hi how to increase the water pressure on ferroli optimax 25C?
FF360 Reset Button Problem?