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