First check the sensor lights.
Garage door not closing sunlight.
Direct sunlight creates interference with the sensors and may keep them from working properly.
Sunlight can interfere with the sensors beam and cause them to act as if an object blocks them.
Many years ago sensors weren t common.
If you are in a hurry and need to get your garage door closed right away stand in such a way that you cast a shadow over your garage door s beam sensor but of course don t block the beam itself just the sunlight that is shining on it and then press your remote control so that your door will close.
The receiving sensor should mounted on the side of the garage door opening that receives the least amount of direct sunlight.
Nowadays for safety reasons most garage doors have them.
The sensors only work when the door is in the process of closing.
Cutout cardboard and secure it around the sensors purchase sun shields that attach to the sensors move the sensors into the garage and out of the sun switch sides the sides of the sensors.
The problem is the infrared safety sensors which sit at the base of the tracks that prevent the door from closing when there s something in the door opening can get somewhat blinded if there s too much sunlight.
Depending on the brand.
Here was one way a homeowner dealt with issues with the sun he moved the sensor on the rail to the end of the track.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.