Something mechanical has most likely bound up.
Garage door does not go down all the way.
Start by making sure your garage door is open all the way.
Carefully inspect the track and the rollers to see if something is stuck.
You should also find buttons or nobs that will adjust the force too.
If there s something blocking the door from closing all the way a full close will be impossible.
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.
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.
Depending on the brand.
First check the sensor lights.
Something blocking the door.
Though this problem should be obvious it shouldn t be overlooked.
Also check the cables.
Adjust in small increments a half turn or less.
One or more of these reasons is likely responsible for your garage door closing partially but not all the way.
Locate the limit adjusters.
The limit adjusters control how far the garage door goes up and how far it goes down.
When the door won t go down automatically.
A twisted or slightly bent track may be the culprit.