Investigated why thermostats and sensors are not syncing with AC system. Got on the phone with tech-support and determine that there is no back net connection on master thermostat which means it’s possible that there is no cable ran to interface module from dampers in ceiling. Client is going to contact the company that installed the system because it still may be under warranty with them. Explained to them that if they would like we can come back out and Investigate and locate where dampers and modules are located in ceiling.