While you wait for answers, we may have found some information which could help you.
Click here for Heating Pressure DropsWhat is wrong with my ravenheat white star combination boiler,?
ravenheat csi 120 no hot water?
Ravenheat CSI 85 Red Light?
Faulty Worscester 35 CDi loosing pressure?
ravenheat csi 85 b (t) hot water no central heating?
Central heating but no hot water?