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I assume it is a wireless station. If so, there is a procedure to go through to get the temperature sender and the base station to sync up and work. You need to check your owners manual to get the exact procedure for your unit. On my station, I have to remove the battery from the base station, let it power up and within 5 minutes, install the battery in the remote station(s) (temperature, rain gauge, wind gauge, etc.). Also, you must keep the remote station within a certain range for the base to get a good signal. Probably 25 feet, but the owners manual will have the right number. Also, use new batteries.
There are a couple of possibilities for the failure to transmit/receive outdoor data. First, resynch the two units. This will depend on the manufacturer. For some brands, you need to take the batteries out of both the indoor and outdoor units for 10 minutes. Then put the batteries into the devices with both side by side (working inside is easier). Wait until the outdoor data is displayed. There are some weather station systems where the outdoor unit isn't weather-proof. You may need to dry the outdoor unit for several days after removing the batteries before resynching it to indoor sensor.
If the data displays properly when the outdoor unit is inside, you may have the outdoor sensor too far away from the indoor unit. (The distance will depend on the number of walls and the composition of the wall studs/siding.) Try keeping the two units closer together.
If the outdoor data isn't displayed when the two units are side by side and the reset procedure doesn't work. One device has an internal malfunction (transmitter or receiver failed). It's probably best to replace the unit. If it is under warranty, contact the manufacturer.
I hope this helps. For specific details on resetting the indoor and outdoor units to synch them, please add a comment with the make/model of your weather station.
(I've seen Davis Weather stations damaged by a close lightning strike. The outdoor unit had to be replaced.)
There are a couple of reasons that this can happen. First try replacing the batteries in the outdoor control. Also replace the batteries in the base (inside unit).
You may also need to resynch the two units. (For some models, this requires bringing the outdoor unit inside and removing the batteries. Then add the batteries and let the base station look for the outdoor unit.) With the Davis instruments weather station with the solar powered unit, clean the solar panel. You may need to replace the rechargeable battery.
Sometimes, lightning strikes near the weather station external unit causes a surge that damages the unit. In that case, the entire board may need to be replaced to fix the problem.
Please add a comment with the manufacturer for additional information.
I have three of these WS-916OU-IT units. After a few years, the outside sensor just fails. You will get dashes and a "TR" low battery signal, even if the batteries are good
just buy another whole weather station (short money) and set both the old and new weather station unit to receive from the single new outdoor sensor.
To do this - just follow the procedure for a single sensor - that is - put the batteries in the new sensor - then within 30 seconds - put the batteries in all the weather stations - they will all pick up the same outdoor sensor.
I now have three units running off of one outdoor sensor.
Seems a bit silly, but it works.