There are 2 primary
In most cases if one of your springs is broken it can 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 is best not to try to open your door yourself. It can lead to injuries.
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While the normal homeowner should by no means attempt to replace an torsion spring with no specific training, extension springs are feasible to replace. Replacement springs will generally be found in big box stores.
If you try to close your garage door using your opener and the door goes part way down, then stops and goes back up, you most likely have something blocking your door’s travel path. Or perhaps not
At the bottom of the tracks on either side of your garage door opening, you will most likely see a pair of stop/reverse lights. These lights are actually a transmitter plus a receiver of infrared beams. If the beam is interrupted your door will stop going down, turn around and go all the way back up. More often than not your garage door light will flash when this happens.
Occassionally your garage door’s "eyes" will get bumped in such a way that they are no longer pointing in the direction of each other. If that is the situation, carefully adjust the beams. Do not knock them with a hammer. There are adjusting brackets attached to the tracks that should be adjusted with a screw driver.
If adjusting the beams does not fix your problem, vigilantly check around the opening of your garage door. The object that can be blocking the door’s path may not be totally apparent. Look carefully.
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. Perhaps a bug or smear has gotten on the lense.
The root cause may very well be your garage door opener unit. Although they’re extremely dependable, things can easily fail with them. The 2 significant repair items with the opener unit are the gear sprocket and the logic or circuit board.
If your opener is the problem you may be pleased to know that you probably don’t have to replace it. Components are obtainable to garage door technicians who will repair your opener at a fraction of the cost of a new opener.
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One of the good things regarding garage doors is that they are extremely reliable. Most homeowners go years and years without a trouble. That means that when a issue does develop, it is often a new experience for a homeowner. With any luck your repair will be easy and the cost affordable. Good luck!