Short answer: With the door fully closed, pull the red manual release cord to disconnect the door from the opener, then lift the door by hand using the handle, not the panel seams. A healthy door should lift with steady effort. If it feels very heavy or won't budge, stop, because a spring may be broken. Lock the door by hand while the opener is disconnected, and reconnect it when power returns.

When the power goes out, a garage door opener stops working, and the door stays wherever it was. If your car is inside, you need a way to get the door open by hand. Every home garage door opener has one, and it takes about a minute once you know how.
The key is doing it safely. The steps are simple, but there are a couple of things that matter a lot.
If the door feels very heavy, jerks, or one side rises faster than the other, stop and lower it gently. Those can be signs of a broken spring or a cable problem. Our list of spring warning signs explains what to look for.
While the door is disconnected from the opener, the opener's locking effect is gone. The door can often be lifted from outside. After you pull the car out, close the door by hand and use the slide lock on the inside of the door if it has one. If you leave, lock the door into the house as well.
Some garages have an outside release, a small keyed lock on the door that lets you pull the release from outside when there is no other way in. If you don't have one and your garage has no side entrance, it is worth asking a professional about.
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Opener models differ, so check your manual. On many openers you reconnect in one of two ways:
After you reconnect, run the door through a full cycle. Then test the safety sensors and the auto-reverse, since a power surge can sometimes affect settings. Our garage door safety guide explains both tests. If the door won't close properly afterward, why a garage door won't close covers the usual causes.
Call for help if the door won't lift, feels very heavy, comes off its tracks, or won't stay up. Don't try to lift a door with a broken spring, and don't try to fix springs, cables or bottom brackets yourself. They are under high tension. A yearly tune-up is a good time to check that the door is balanced and the release works the way it should. Here is what a tune-up actually checks.
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With the door fully closed, pull the red manual release cord down and back to disconnect the door from the opener. Then lift the door by its handle, slowly and evenly, until it is fully open.
A properly balanced door should lift with steady effort. If it feels very heavy, a spring may be broken or out of adjustment. Stop, lower it gently and have it checked.
Often not. Once the door is disconnected, it can usually be lifted from outside. Use the slide lock on the inside of the door if it has one, and lock the door into the house.
Unlock the slide lock if you used it, then check your manual, since it depends on the model. On many openers you pull the release toward the door and then run the opener until the carriage clicks back onto the door.