When you hit the up and down arrow on the display does it show any readings? What A-B-C channel do you have the sensors on that you are trying to transmit? What is the name brand of the batteries you are using? We would recommend bringing the sensors inside next to the display and removing the batteries for about 2 minutes from the sensors. After the 2 minutes put the batteries back in and see if the display is able to detect the sensors. If you have the A-B-C channel on A then that sensor should read under sensor A. Please let us know if there is anything further we can assist you with.