Each sensor will usually have a light. One will have a green light, used to show that the units are powered up, and the other will have a red light to show that there's no obstruction between the sensors and that they're 'seeing' each other. Feb 12, 2020
Why Does My Garage Door Stop and Go Back Up? A garage door that stops and goes back up is usually due to malfunctioning infrared sensors. If there is such an issue, you can see one of the sensor lights blinking. Malfunctioning sensors can be caused by a blockage, dirty eyes, loose wires, or just bad sensors in general.
Garage Door Bent at Bottom However, the fix could be as simple as hammering the dent out, depending on the extent of the damage. In these cases, experts use soft rubber mallets, suction cups, or heat to gently tap, pull, or warp the dent until it returns to its original shape. Apr 20, 2022