While you wait for answers, we may have found some information which could help you.
Click here for Wrong Years Agopressure dropping on openning the hot water in my ravenheat csi 85 aboiler?
ravenheat csi 120 no hot water?
minimal hot water ?
Ravenheat CSI 85 Red Light?
Faulty Ravenheat condensing boiler?
ravenheat csi 85(t) 780 series red light flashing?