While you wait for answers, we may have found some information which could help you.
Click here for Light Ravenheat Boilerpressure dropping on openning the hot water in my ravenheat csi 85 aboiler?
Central heating but no hot water?
ravenheat csi 85 b (t) hot water no central heating?
how can i ignite the pilot light on a ravenheat boiler?
ravenheat csi 120 no hot water?
Ravenheat CSI 85 Red Light?