If the wiring and installation is correct, The following Setting has to be set on Both Thermostat and Sensors:
1. Thermostat Dip Switch # 8 has to be set to OFF.
2. Sensors Dip switches : # 1 and 2 set to ON and Dip Switch # 3 and 4 set to OFF.
then the Thermostat and the Sensors will Communicate to the same number.