There are 2 Garage doors have two major kinds of springs. The most common type of spring is a torsion spring. Torsion springs are installed above the door opening. Tension springs are installed alongside the garage door's horizontal tracks. Both forms of springs do the identical thing. They supply most of the power that causes your door to open.
In the majority of cases if one of your springs is broken it will be entirely not possible to open your garage door. The exception is if you have a single door and it is made of a light metal. In any case it's best not to attempt to open your door yourself. It might lead to injury.
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Torsion springs are difficult to replace. If you have had no definite hands on training on how to replace your tension spring, do not even think about it. Not only that, but torsion springs are hard to find at local stores. Extension springs can be replaced by an enterprising do it yourself homeowner. A limited supply of extension springs can be found at hardware or home improvement stores.
But this is an item you can easily and may repair for yourself. When you've got an opener, you also have some sort of interrupter gadget that keeps the door from closing if its path is blocked.
At the bottom of the tracks on either side of your garage door opening, you may most likely see a set of stop/reverse lights. These lights are in reality a transmitter and a receiver of infrared beams. If the beam is interrupted your door will stop going down, reverse and go all the way back up. Usually your garage door light will flash when this happens.
On occasion your garage door eyes will stop and reverse your door when there is no apparent reason. One reason might be that your stop/reverse units have been bumped and are no longer pointing at each other. If you suspect that is the problem, use the set screws or wing nuts to correct the lights, not a hammer.
If your garage door still refuses to go down and stay there, keep looking. Determination will pay off. You will eventually see something blocking your garage door's "eyes.
If you've spent quite a time looking for the article that is blocking your garage door and nothing seems to work, try wiping the lenses of your stop/reverse lights with a paper towel. Maybe a bug or smudge has gotten on the lense.
If cleaning the lenses doesn't make your problem go away, the responsibility may lie with your garage door opener. You might have a bad sprocket or bad logic board.
While a homeowner armed with an adventurous spirit and a certain amount of mechincal aptitude can replace a logic board and a gear sprocket, perhaps the easiest course of action is to merely phone a garage door specialist and have the problem taken care of.
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Garage doors are regularly extremely reliable and taken for granted by their owners. That means that when one breaks, it is usually a new experience for the average home owner. They are not aware of the existence of garage door companies and they are anxious that their garage door will be costly to fix. Fortunately garage door businesses are in a competitive environment and this keeps their prices reasonable. Give one of them a call. You can be pleasantly surprised.