The garage door sensors are essential because they make sure that your door won’t accidentally crush a person or an object. When the door closes, an infrared beam from the sensors is projected on the photo eyes. If the beams are not obstructed, the door will close. Otherwise, it will stay open.
If there is something wrong with one of the sensors, one of the sensor lights will blink. You can ask a technician to help you replace the sensor or you may clean the lenses just in case it is stained.
In addition, a sensor may get dislodged. Because of its location, it can be easily knocked off by animals or kids. Fortunately, it is easy to put the sensors back in its correct position. If you are having any trouble putting it back, you should call for a professional garage door service.