While you wait for answers, we may have found some information which could help you.
Click here for Domestic Hot Water Central Heatingravenheat csi 120 no hot water?
ravenheat csi 85 b (t) hot water no central heating?
csi 85t ravenheat no power at fan?
minimal hot water ?
Faulty Ravenheat condensing boiler?
pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?