While you wait for answers, we may have found some information which could help you.
Click here for Central Heating Secondsravenheat csi 85(t) 780 series red light flashing?
Ravenheat CSI 85 Red Light?
ravenheat csi 85 b (t) hot water no central heating?
csi 85t ravenheat no power at fan?
Central heating but no hot water?
What is wrong with my ravenheat white star combination boiler,?