Bring the outside sensor inside. Take the batteries out of the sensor and out of the main unit. Wait 10 minutes. Put the batteries back in the remote sensor. Put the batteries back in the main unit. Do not touch any of the buttons. Wait 10 minutes. If the remote temperature is not showing within 10 minutes, try again. Once the remote temperature is showing, you can set the clock.
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Bring the outside sensor inside. Take the batteries out of the sensor and out of the main unit. Wait 10 minutes. Put the batteries back in the remote sensor. Put the batteries back in the main unit. Do not touch any of the buttons. Wait 10 minutes. If the remote temperature is not showing within 10 minutes, try again. Once the remote temperature is showing, you can set the clock.