My garage door will open only a few inches and then stops.
Garage door only goes down a few inches.
This just started a couple weeks ago.
Continue to turn the down.
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.
It goes partway down reverses direction and goes back up again.
Turn the down adjustment one full turn counterclockwise.
The garage door can be operated manually by disconnecting the garage door opener from the door using the red pull cord.
If the door is working properly it should be easy to lift by hand.
You push the button to close the garage door.
Try to lower the door.