It could be that they are just barely aligned but the vibration from closing causes them to intermittently break the beam.
Nothing blocking garage door still wont close.
Now if there is nothing physically blocking the door and sensors you can check the safety.
First check the sensor lights.
The first step to take when your garage door won t close is to look around and do a visual check.
The sensors may not be aligned properly.
The majority of garage doors manufactured since the early 1990s are equipped with this safety feature.
These obstructions can include anything like a garden tool a lawn chair or anything else in the way.
Now if your garage door still won t go down after you ve made sure the sensors are properly aligned and there s no obstructions you ll want to take a damp cloth and wipe down the lenses of the sensors.
Could also try disconnecting the door from the chain should be a pull cord that allows this.
Something blocking the door.
What to do when your garage door won t close 1.
Though this problem should be obvious it shouldn t be overlooked.
One or more of these reasons is likely responsible for your garage door closing partially but not all the way.
The photo eye components consist of two pieces that align face to face across each side of the garage door roughly four feet above the ground.
If your garage door won t close all the way the problem could be due to a blocked photo eye.
Then try closing the door manually.
Try the wall.
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.