There are 2 varieties of springs in garage doors. There's torsion springs which are installed above the door opening and tension springs which are mounted along each tracks. Each tension springs and torsion springs serve the identical application, they supply a nice deal of the power that permits you or your opener to open your door.

The failure of either one of the two springs on your garage door will most likely keep you from being able to open your garage door.

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While the normal homeowner should never attempt to replace an torsion spring without specific training, extension springs are possible to replace. Replacement springs can as a rule be found in big box stores.

If you make an attempt to shut your garage door using your opener and the door goes part way down, then stops and goes back up, you most likely have an object blocking your door's travel path. Or possibly not

By far the most widespread sensor that stops and reverses your garage door is a pair of "eyes" that are situated toward the bottom of your garage door's track on either side of the door.

Occassionally your garage door eyes will stop and reverse your door when there's no apparent reason. One reason may be that your stop/reverse units have been bumped and are no longer pointing at each other. If you think that is the problem, use the set screws or wing nuts to correct the lights, not a hammer.

If adjusting the beams does not handle your problem, vigilantly look around the opening of your garage door. Whatever can be blocking the door's path may not be totally obvious. Look carefully.

If you've spent quite a while looking for the thing that is blocking your garage door and nothing seems to work, try wiping the lenses of your stop/reverse lights with a paper towel. Perhaps a bug or smudge has gotten on the lense.

If your door is still acting irradically the trouble may not be your stop/reverse lights after all. You may have a problem with the logic board or the gear sprocket in your opener.

If your opener is the problem you will be glad to know that you probably don't have to replace it. Components are available to garage door technicians who will repair your opener at a fraction of the price of a new opener.

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One of the nice things concerning garage doors is that they are extremely reliable. Most people go years and years without a issue. That means that when a issue does develop, it is frequently a new experience for a homeowner. With any luck your repair will be simple and the cost reasonable. Good luck!