9640itc I have 3 uts one is still working perfect. The other 2, the outside temperature show --. I tried replaced batteries on both and still not working. Time and inside temp still work

SOURCE: Outside Weather Not Displaying

Restart as if from new ie as if it is being taken out of the box

SOURCE: resetting the atomic clock to the correct time zone, and outside temp to work.

For the Sharp SPC374T Atomic Clock - Time Zone setting- Press the 'Time' button once, the time zone will show where 'Day' usually is, use the Up or Down buttong to adjust.

For the outdoor Thermo, credit to my neighbor for this one. Remove battery from main unit, wait 2-3 minutes. Reload batteries. Once you get a reading from the outdoor sensor, hit the reset on the main unit. You will have to reset the time zone as described above, but this worked for me after 10 months of no outside temp showing up!

Good luck,
Doc

SOURCE: Remote Sensor

make sure your time is set and the atomic clock time is recieved, then leaving the rear cover off of the transmitter, push the "tx" button not the "c/f" that is just for centegrade or ferenhight. you will see the red light on the front of reciever flash in a few seconds. The temp should display on your clock screen. If not, did the red l.e.d. light on transmitter flash. If not, its not sending data to clock. I have to reset and hit transmit every time I replace batteries on transmitter. Had no problems for over 2 years of using outside. If your not getting a reading with transmitter sitting next to clock after hitting "tx" button you may have defective transmitter.

SOURCE: skyscan digital wall clock just quit showing outside temperature

you probably need to 'pair' the outdoor sensor with the main base: look for a 'channel' button, as these units usually can get information from several sensors and differentiate them by a channel number.

SOURCE: outside temp does not read new batterys in both

Double check the batteries to make sure they are installed correctly. If one of the batteries in the outdoor sending unit is in backwards, it will not send the outdoor data. On the indoor unit, there is typically one battery that is used for receiving the signal from the outdoor unit. If all of the batteries are in correctly but that one, you will see the display and the indoor temperature information, but the outdoor information will not be displayed.