While you wait for answers, we may have found some information which could help you.
Click here for Working Fine Years Nightminimal hot water ?
pressure dropping on openning the hot water in my ravenheat csi 85 aboiler?
What is wrong with my ravenheat white star combination boiler,?
ravenheat csi 85(t) 780 series red light flashing?
Ravenheat CSI 85 Red Light?
Faulty Ravenheat condensing boiler?