Nowadays for safety reasons most garage doors have them.
Sun on garage door sensor.
These cardboard safety sensor sun shields are used to prevent sunlight from shining into sensor causing accidental reversal of garage door.
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Many years ago sensors weren t common.
Sunlight can interfere with the sensors beam and cause them to act as if an object blocks them.
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The sensors only work when the door is in the process of closing.
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Liftmaster chamberlain sears craftsman and chamberlain brand garage door opener safety sensor sun shields.
Cutout cardboard and secure it around the sensors purchase sun shields that attach to the sensors move the sensors into the garage and out of the sun switch sides the sides of the sensors.