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.
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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.