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Try taking the inside unit outside as close to the transmitting unit as possible for three minutes. The signal might lock on to the setting you want to receive.
Double check the batteries and the direction in which they are installed. If there is one backwards in the sending unit that is outside, it will not send a signal. Also, there is typically one battery in the indoor unit that is responsible for receiving the signal from the outdoor unit. If all of the batteries are in correctly except that battery, you will see the display, but will not get the data transmitted from the outside sending unit.
I had same problem. Take all batteries out of both units. Put the batteries in the remote sensor FIRST. Then put batteries in the main unit. Within five minutes, they will link up. Problem solved!
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