Arrived on site to troubleshoot a system unable to keep up with summer cooling demands. Home is a new build and only 2 years old. It’s a zoned carrier split system and we discovered that in cooling the DAT sensor was poorly located and caused the zone board to cycled on and off. Short cycling the system in cooling. We relocated the sponsor into the air stream and eliminated it from being an issue and the system ran without issue. Previous contractors disconnected y for the downstairs unit so it was only able to cool upstairs and. They replaced dampers and played with airflow to attempt to resolve the issue but with low setpoints, supply temps are often in that 45-58 degree temperature where the DAT sensor cuts off the Honeywell zone board. We tested amps, refrigerant charge, and signed client up for Homecare Maintenace program. Call complete.