Communicating system. Was told that thermostat said wait and the system wouldn’t come out of wait. To turn on the AC. When I arrived, I turned system on everything came on drain trap was kind of dirty so it’s there’s a possibility that the float which triggered the issue. We started and stopped the unit several times and ran it for a while with no other issues. If this happens again now that the drain is clear, we may have to call Tech Support and have them help us figure out what’s going on. Temperature difference was 20° Also noticed that the return air duct was vibrating, causing a humming noise. Went ahead and checked static pressure on the system and for 4 ton unit I believe the ducks are too small to carry the air as the filter is clean. The system has .9 static pressure. This can cause blower motor issues and compressor issues. But this has nothing to do with what’s going on today.