Turn the down adjustment one full turn counterclockwise.
Garage door only goes down a few inches.
Continue to turn the down.
My garage door will open only a few inches and then stops.
This just started a couple weeks ago.
My garage door opens about six inches and stops i press the button twice so it will stop going down and then is goes up another 6 inches or so.
For most doors a complete rotation of the screw allows the door to advance 2 inches.
Try to operate the garage door manually this helps you determine if the problem is related to the door or the motor.
This is almost always the result of a dirty or obstructed safety feature.
Try to lower the door.
The garage door can be operated manually by disconnecting the garage door opener from the door using the red pull cord.
It goes partway down reverses direction and goes back up again.