While you wait for answers, we may have found some information which could help you.
Click here for Combi Boiler Ravenheat Rsfravenheat csi 120 no hot water?
ravenheat csi 85 b (t) hot water no central heating?
What is wrong with my ravenheat white star combination boiler,?
Faulty Ravenheat condensing boiler?
Ravenheat CSI 85 Red Light?
Faulty Worscester 35 CDi loosing pressure?