have a newly installed xrv that will not load above 80 percent , locked drive at 100%, flows are good, tubes are clean, around one degree approach on cooler (at 80%), vanes are calibrated and checked. vanes wide open still only 80 percent load on motor. its still under warranty so it is not really my issue but i am still curious , besides i don't have a lot of faith in the local carrier office most of there techs now work for the same company as me.