While you wait for answers, we may have found some information which could help you.
Click here for Ravenheat Boiler Hot Waterravenheat csi 85(t) 780 series red light flashing?
Faulty Worscester 35 CDi loosing pressure?
Faulty Ravenheat condensing boiler?
ravenheat csi 120 no hot water?
csi 85t ravenheat no power at fan?
ravenheat csi 85 b (t) hot water no central heating?