Upon my arrival in Coupland the water had all drained out so I tested the system and found that the drain line was backed up. I cleared the drain line and poured some drain pan treatment down it. Went ahead and checked the temperature split to make sure the system wasn’t low and freezing up. The temperature split was good. This ended being a warranty call since we were just out here for the cleanings on the 4th. Left the system running.