If simply hitting the button does not work you will have to take more action.
How to get garage door roller back on track.
You need to check the release handle and make sure that it is on the track.
After troubleshooting the tracks to find the problem you can now get to work putting the rollers back on track.
The roller has a stem that fits into a bracket sleeve while the roller itself fits into a track.
Locate where the roller popped out of the track.
Similarly if a roller pops out of the track the repair is to uninstall the hinge first then tip the roller wheel into the track.
Once the door is back on track knock the track back into position with a rubber mallet.
Open the door partially to move the wheels to the point where they are jumping off the track.
Open up the track with pliers.
Locate where the rollers are jumping off the track.
Remove the locking pliers.
This makes it impossible to replace a garage door roller without unbolting the hinge that holds the roller from the door panels.
Make sure the roller is in the center of the track.
However it s not guaranteed that the roller will stay there no matter what.
The garage door track curves up at the bottom to hold the wheel in place.
The next step is to go to the inside of the garage door.
Now take the pliers and pry open the track.
Now you will be able to open the door manually.
Some units will actually reconnect themselves but this is not typically the case.
Lift the garage door so the roller and the length of track you bent are lined up again.
Once you have located the position use locking pliers to hold the door open by clamping them on one end of the track.
The first thing to do is hit the door button.
The doors on your garage are moved smoothly up and down by garage door rollers these are held in place by brackets that are attached to the door of your garage.
Set the roller back in the track.
It is relatively simple to fix a garage door that has derailed.
The roller should smoothly move up and down in the track.
The point where the roller is nearest the track is probably the point where it jumped the track.
Hit the end of the roller in the hinge with a hammer to push it back into place.
Use a rubber mallet to tap the edge of the roller back into the track.
Open the door while holding the roller against the track.