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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.)
According to instructions for similar systems, you have to replace batteries in the outdoor unit first, then the indoor unit and wait 10 minutes without pressing any buttons for the indoor unit to begin displaying the outdoor temperature.
I tried this and it worked fine FACTORY RESTART: A Factory Reset will erase the connection between the Display and the Thermo-hygro sensor and allow a fresh connection to be re-established. It is recommended to have the display and all sensors 5-10 feet apart for this restart.
ENTER PROGRAM MENU Press and hold the SET button until you enter the program menu. Press and release the SET button until you see 'rES oFF' flashing.
FACTORY RESET ON Use the UP ARROW key or DOWN ARROW key to turn rES on.
CONFIRM & COUNTDOWN Press the SET key to confirm and a countdown timer will begin counting down from 127. When the timer displays dOnE, you must remove the batteries from the display for 10 minutes
REMOVE BATTERIES FROM THERMOHYGRO AND RAIN While the batteries are out of the display, also remove the batteries from the Thermo-hygro sensor and the Rain sensor. Wait 15 minutes.
GENTLY KEY THE WIND SENSOR Gently key the wind sensor one time to activate the sensor.
INSTALL BATTERIES INTO THERMOHYGO AND RAIN Insert fresh alkaline batteries into the Thermohygro sensor and Rain sensor make sure to check polarity with the markings on the battery cover and inside the battery compartment. Wait 2 minutes.
INSTALL BATTERIES INTO DISPLAY: Insert fresh alkaline batteries into the Display. Make sure to check polarity with the markings inside the battery compartment 15 MINUTES: Wait 15 minutes for the outdoor weather data to display. If the outdoor data displays dashes after waiting for 15 minutes, repeat the steps of restart. AZ Road Runner
RESTART DISTANCE: For best results please bring the outdoor sensor in the house and place 5 feet from the display unit.
REMOVE POWER: Remove batteries from the sensor. Next remove batteries (and/or a/c cord) from the display.
DISCHARGE ELECTRICITY: With the power source removed, press one of the buttons on the display at least 20 times to clear all stored power. Please do this even if the display is blank to remove any remaining power. Verify the display is blank.
UNPOWERED FOR 15 MINUTES: It is important with most of our displays to remain without power for at least 15 minutes.
NOTE: Failure to allow a display to rest for 15 minutes can result in failure to connect with the outdoor sensor or missing segment on the display. The instruction manual describes a setup for a new unit that has not had time to build up stored power.
BATTERIES: Please be sure you are using fresh batteries tested to a minimum of 1.48, on a voltmeter that reads in numbers.
SENSOR FIRST: Place batteries into the outdoor sensor first. Make sure they are installed according to the polarity diagrams in the battery compartment.
DISPLAY NEXT: Install batteries (or a/c cord) into the display according to the diagram in the battery compartment.
CONNECTION: Allow the sensor and display to remain 5 feet apart for 15 minutes to establish a strong connection. Do not press buttons at this time. You should see a reading on the outdoor temperature area in the first minute.
Bring the outdoor sensor indoors. Take the batteries out of the sensor and out of the main unit. Wait 10 minutes. Put the batteries back in the outdoor sensor. Put the batteries back in the main unit. DO NOT PRESS ANY BUTTONS. Wait 10 minutes or until the outdoor temperature shows. Once the temperature shows you may use the buttons to set the clock, etc. If it does not show after 10 minutes, then try again.
Bring the outdoor sensor inside. Take batteries out of both the sensor and the main unit. Wait 10 minutes. Put batteries in remote sensor. Then put batteries in main unit. Don't touch any of the buttons for 10 minutes or until the outdoor temperature is displayed. If still not displayed after 10 minutes then try again.