Electric eye sensors are found on many garages today and adjusting your garage door electric eye can seem like a daunting task. Developed as a safeguard against injuries caused by garage doors closing on small children and pets, when the beam of the sensor (usually located approximately four inches from the ground) is broken during closing, the garage door reverses and reopens.
In very simple terms, when the beam from the "sending eye" is no longer received by the "receptor eye," an electronic alert is sent, and the door stops closing. This breaking of the beam is generally caused by a human/animal movement, thus serving its purpose as a safety feature. But what if the garage door refuses to close without any apparent safety threat? What if the only way to close the garage seems to be by holding down the button on the remote? The electric eyes are probably misaligned, causing the door to think there is constantly something in its way.
To remedy this problem, all one must do is realign the sensors. To do this, first locate the sensor that seems most out of position. The sensors should be facing straight ahead and not at an angle. Once this has been done, find the wing nut. This is what keeps the sensor attached to the door. Using a wrench, loosen the nut until the sensor can be manually adjusted. Then, with your hand, simply straighten the sensor so that it appears to be sending into or receiving from its pair. Retighten the nut so that the sensor is firmly positioned.
Note that at least one of the sensors had a light that was flashing, or was off but is normally lit. The flashing indicated that the beam was perceived as broken. When the light is on steadily, it means that the sensors are aligned. If after this first adjustment the light is still blinking or is off, the adjustment did not work. If the sensor opposite the one that was just aligned seems to be positioned correctly, tinker with the same sensor again to try to align it correctly a second time. If it is suspected that the other sensor might also be misaligned however, follow the same procedure for that sensor. Once the sensors are adjusted correctly, the light should shine steady. Step back and test the garage door. It should be operating without difficulty.
Note that hand tightening the screw is also a viable option. Although it won't secure the sensor as tightly as when using a wrench, it will make adjustments to the sensor easier should this dilemma occur again.
This task is easy to accomplish, and should take no longer than ten minutes. Keep in mind that this issue was most likely due to a sensor simply being knocked into, causing the beam from the sending eye to not be received by the receptor opposite of it. It may serve one in the future to warn children not to play around the sensor and take extra precaution while moving about it so as to ensure this problem from reoccurring.