A twisted or slightly bent track may be the culprit.
Garage door does not go down all the way.
If there s something blocking the door from closing all the way a full close will be impossible.
On the main console the box that hangs from the ceiling you ll see a few different nobs and or buttons.
Though this problem should be obvious it shouldn t be overlooked.
Carefully inspect the track and the rollers to see if something is stuck.
Adjust in small increments a half turn or less.
Depending on the brand.
Garage doors are heavy and to prevent injuries manufacturers of automatic openers include safety sensors to stop the door when someone is in the way.
First check the sensor lights.
If you operate your door manually and the door will not go all the way down don t force it.
One or more of these reasons is likely responsible for your garage door closing partially but not all the way.
Start by making sure your garage door is open all the way.
Something blocking the door.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
Locate the limit adjusters.
How to adjust a garage door opener s travel setting when the garage door won t close all the way adjusting the travel setting on a garage door opener the craftsman garage door opener shown here has two set screws that control door travel.
The limit adjusters control how far the garage door goes up and how far it goes down.
Something mechanical has most likely bound up.