While you wait for answers, we may have found some information which could help you.
Click here for Ravenheat Combi PilotFaulty Worscester 35 CDi loosing pressure?
csi 85t ravenheat no power at fan?
Ravenheat CSI 85 Red Light?
What is wrong with my ravenheat white star combination boiler,?
ravenheat csi 120 no hot water?
Central heating but no hot water?