My Radio Shack Weather Forecaster has this same problem. Cat. No. 63-1090 and 11A08 on both units. I changed fresh batteries into both units. I did this in the house with the two units together. At first, the base unit showed the inside temperature from the remote unit. I returned the remote unit to its outside location and went to bed. In the morning, the display for the remote/outside was once again blank. I have used the 'reset' feature of both units (next to one another) and now cannot get even the inside temperature to register. Your assistance is greatly anticipated and appreciated. Jim in Arizona

Hello Anonymous
I answered this yesterday. The service to YOUR 90005 has been withdrawn and you have to return the unit for a free replacement.

Look at you NOTIFICATIONS, the Bell icon next to your name.

Here is is again

Effective December 31, 2019, service for the Bushnell WeatherFX Weather Forecaster will end. As a thank you for being a valued Bushnell customer, Bushnell is offering to replace your Bushnell WeatherFX Weather Forecaster with a comparable replacement weather forecasting device.
To take advantage of this offer please ship in your Bushnell WeatherFX Weather Forecaster to the address on this page. Within 30 days upon receipt of your Bushnell WeatherFX Weather Forecaster, we will ship out a comparable replacement weather forecasting device. Please include your name, address, and telephone number.

WeatherFX Replacement - Bushnell

https://www.bushnell.com > bu-weatherfx-replacement
WEATHERFX WEATHER FORECASTER SERVICE WILL END BY DECEMBER 31, 2019. Effective December 31, 2019, service for the Bushnell · 950003 · 950005 · 950007 ...
You visited this page on 05/09/22.

mine tells me to replace the batteries in both units

Here's the manual for the AcuRite Weather Forecaster. If it's not showing the outside temperature, make sure the A-B-C switch is set to match the display unit. Not doing so might be the reason it's not synchronizing and displaying the outdoor temperature. https://www.acurite.com/media/manuals/75077-75107-instructions.pdf

It takes a few days before the unit will forecast. It has to collect the weather conditions for a period of time, in order to make a forecast (the barometric pressure, mainly).

Step 1:

CHECK OP (Check Operation) means your radio has not received any type of
SAME alert signal (include test or demo signals) for about 10 days.

Make sure the antenna is fully extended and the stored location is correct. See
"Programming Locations and SAME Codes" on page 9 for more information.

Step 2:

Here is a link to the manual

http://www.radioshack.com/graphics/uc/rsk/Support/ProductManuals/1200521_PM_EN.pdf

http://support.radioshack.com/manuals/ome63-1085.pdf

I presume by sensor you mean the remote sensor not the main unit which also has sensors? When you buy the 1090 you get one external/remote sensor which is also labeled 1090. If you buy extra sensors they are 1092's. Another new 1092 sensor should work with your 1090 it does on mine. You can have up to 3 remotes just set the channel on them. Getting one is the problem. If your talking of stripping the box down to replace the sensor , well I am sure more than the sensor would have a fault!

how do i set up my 63-1090 clock need instructions thank bobby woodberry

http://support.radioshack.com/manuals/ome63-1090.pdf