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