While you wait for answers, we may have found some information which could help you.
Click here for External Boiler StartCentral heating but no hot water?
how can i ignite the pilot light on a ravenheat boiler?
minimal hot water ?
What is wrong with my ravenheat white star combination boiler,?
ravenheat csi 85 b (t) hot water no central heating?
Ravenheat CSI 85 Red Light?