There are two Garage doors have two major types of springs. The most typical sort of spring is a torsion spring. Torsion springs are installed above the door opening. Tension springs are put in alongside the garage door's horizontal tracks. Both kinds of springs do the same thing. They supply most of the energy that causes your door to open.
In the majority of cases if one of your springs is broken it will be completely 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 try to open your door yourself. It might lead to injuries.
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Unfortunately for many homeowner, if one of your springs is damaged, there's not much to do apart from to call a garage door repair business and have them come out and change the springs.
There are a number of things about your garage door that you can trouble shoot and fix youself. If you have a garage door opener then you also have some type of interrupter device that can stop your door from closing if an object is in the way. Generally they are stop/reverse lights.
At the base of the tracks on either side of your garage door opening, you will most likely find a pair 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. As a rule your garage door light will flash when this happens.
Does your garage go down, then back up for no perceptible reason? If you have carefully looked for for something in the way of the door and can't see anything, you may have bumped your stop/reverse lights out of alignment.
The main cause that your door will stop and reverse is that your "eyes" are working precisely as they are designed to. There is an object blocking your garage door. Sometimes the object that is blocking the door is not apparent, so carefully look around your garage door opening. Eventually you'll figure out what it is.
It is also probable that the lenses of your stop/reverse lights are dirty or have condensation on them. That means that the lights can't see each other and your door won't work.
Your garage door opener unit can fail. They are usually very reliable however they do have elements in them that may fail. Usually the failure of the opener is prompted either by a worn gear sprocket or the logic board.
While a homeowner armed with an adventurous spirit and a certain quantity of mechincal talent can replace a logic board and a gear sprocket, perhaps the easiest course of action is to merely phone a garage door professional and have the problem taken care of.
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There are businesses that work on all kinds and types of garage doors. They'll come to your house or business and carry out an entire repair and overhaul of your door if necessary. They replace springs, rollers, tracks, sections, cables and whole garage doors.