Your limit switch needs to be adjusted.
Garage door reverses when going down.
If you find that your garage door is reversing before even hitting the floor then it could be possible that there is a problem with the close force setting.
Try to lower the door.
If the door reverses part way down and you are sure there is no obstruction or binding increase the closing force a small amount and try it again.
Photo eyes or safety sensors are mounted to the track on either side of the garage door about 6 inches up from the ground.
This setting basically controls how much force is allowed when closing the garage door.
You push the button to close the garage door.
Continue to turn the down.
But changes in weather conditions can causes your garage door components to shift or contract.
Turn the down adjustment one full turn counterclockwise.
It goes partway down reverses direction and goes back up again.
The photo eyes send an infrared beam across the bottom of your garage door opening if that beam is broken the door will reverse.
If the garage door only travels down an inch or so before reversing something is probably blocking the beam between the two safety sensors at the bottom of the rails or the sensors aren t aligned.
Replace them if they re broken.
For most doors a complete rotation of the screw allows the door to advance 2 inches.
This is almost always the result of a dirty or obstructed safety feature.
Find local garage door repair.
When that happens the distance your garage door needs to travel may change.