While you wait for answers, we may have found some information which could help you.
Click here for Hot Water Presshow can i ignite the pilot light on a ravenheat boiler?
ravenheat csi 120 no hot water?
Ravenheat CSI 85 Red Light?
Central heating but no hot water?
Faulty Ravenheat condensing boiler?
What is wrong with my ravenheat white star combination boiler,?