While you wait for answers, we may have found some information which could help you.
Click here for Boiler Taps Central HeatingFerroli domicondens he26 C fires up but doesn't appear to rectify ?
F40 fault?
Hi how to increase the water pressure on ferroli optimax 25C?
How can i repair a noCN fault on my boiler?
Ferroli Optimax HE31c a26 problem?
ferroli plus 31c has a code b2 any ideas?