Upon arrival, I found the customers three communicating thermostats, not communicating with the outdoor air temp sensor. I also found one of the damper actuators not closing the damper all the way for the upstairs bedroom. I was able to adjust the damper actuator and get the damper working properly. I reprogrammed/reconnected all three thermostats to the outdoor sensor. I disassemble the outdoor sensor and found where the batteries snap in the metal prongs, holding the batteries in were extremely loose and the batteries were coming out. The sensor was also mounted on a door which got opened and closed periodically. After adjusting the battery prongs on the sensor and relocating the sensor. All three thermostats were reconnected and everything is on and working properly at this time. .