Upon arrival system was operating but thermostat was reading 80, homeowner explained to me issues that he was having ever since last technician was out for tuneup and that system was not coming on even though both thermostats were calling for cooling I checked all indoor components and all outdoor components everything was operating as it should and neither indoor nor outdoor unit had error codes on I tested drain line with 2 gallons of water and had no back ups so I ruled out a drain clog I spoke to homeowner again about issues and how he temporary fixed them and we came to the conclusion that it could be the zone board not sending signal to air handler Temporarily bypassed zone board and hard wired upstairs thermostat to unit to keep home cooling Zone control board ordered System left on cooling with upstairs thermostat upon departure