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have a problem which returns every year when outdoor temperatures drop close to freezing. garage door will open only a few inches, then stops. I can close it and try opening it again... same result. After five or six such attempts it typically will open. Interestingly, when I push the switch button mounted on the interior wall of my garage and keep it pushed, the door will open, until I release the button at which point it stops opening.
Newer openers have always been designed to reverse to the open position when a button is pressed during closing. This is a safety feature. To do what you want you must press the button while the door is opening. That will stop it where you want.
The sensors have nothing to do with your door opening. First thing to check are the door springs. One may be broken. Next remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It may be stripped.
You have a door problem. The reason the door is reversing to the open position is because when it bucks the safety senses something wrong. Release the door from the opener and operate it by hand. You should find something.