Knowing how a garage door sensor works allows a homeowner to be watchful for what might affect it.
Sun shield for garage door sensors.
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It may be that your safety sensor is being blinded by the light of the sun.
This video shows how to fold the cardboard shield around each sensor and re align the sensors.
Doityourself has a wonderful explanation.
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How a garage door sensor works.
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If you only have a problem closing your garage door at certain times of the day the sun might be shining into one of the sensors causing it to break the circuit.
Install sensor sun shields to stop bright sunlight from interfering with your garage door opener sensors which can prevent the garage door from closing.
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Only compatible with 41a5266 1 safety sensor brackets.
These cardboard safety sensor sun shields are used to prevent sunlight from shining into sensor causing accidental reversal of garage door.
If your garage door faces south and the door will not go down.
When the device detects any person or object in the path of a closing garage door it signals the motor to stop the downward action and switch the motion into reverse to stop the obstacle being crushed.