We may have found other answers which could help you.
Click here for Water Changed Diverter ValveFaulty Ravenheat condensing boiler?
Central heating but no hot water?
ravenheat csi 85 cuts out restarts every minute ?
ravenheat csi 120 no hot water?
pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?
ravenheat csi 85(t) 780 series red light flashing?