Locate where the wheels have jumped the track apply a pair of locking pliers underneath the door on one of the tracks to act as a stop.
How to get garage door back on track after pulling red cord.
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Do not pull so tight that you damage the cord or the lever.
Pull the outside of the track open with another pair of pliers to put the wheels back on the track.
As long as your sensors are working properly this should have solved the problem.
How to run your garage door manually when you have a power failure or garage door opener problems.
Once the lever is in the opposite location push the button again.
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Pull the outside edge of the track open with a pair of pliers so you can easily get the wheels back on track.
Once the door is back on track knock the track back into position with a rubber mallet.
Then knock the track back into position with a rubber mallet.
Step 2 will allow you to freely move the garage door open and close.