Some older garage door openers do not have nicely labeled adjustment screws for force and travel limits.
Garage door reverses before closing.
How to fix a garage door that keeps reversing.
The garage door opener has several safety sensors photo eyes in place to prevent damage or injury should something obstruct the door as it is closing.
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.
If you garage door is lowering then reversing.
Garage door openers manufactured after 1993 include sensors to prevent a door from closing on a child or pet.
It goes partway down reverses direction and goes back up again.
Garage door reversing before closing.
This is a safety feature that has been added to garage door openers to help prevent the door from closing on a car pet or even a child.
You push the button to close the garage door.