If the green light is flashing or is not illuminated, there's a problem with your sensor. You can test your garage door sensors by placing a cardboard box that's over 6 inches tall in the way of the sensors. If the door closes fully on the box, your sensors are not working and this issue must be addressed immediately.
It's very important not to attempt major garage door repairs on your own, as they can lead to property damage, injuries, or even death.
The causes of your garage door sticking could be that its rollers and hinges simply become stuck or that the track is dirty or clogged. If your garage door's rollers and hinges are stuck, try applying some lubrication such as WD-40. This should get your garage door back to opening and closing smoothly.
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.