Garage doors have two main styles of springs. Extension springs run above the horizontal tracks on either side of your garage. They get their power by extending. Torsion springs run along a bar you can see above your garage door when it is closed. Torsion springs get their force from twisting.
If one of the springs on your garage door breaks, you may not be able to open your door. The springs are under tension when your door is closed, so the break is most likely occur without you even being conscious of it happening.
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While the average homeowner should never try to replace an torsion spring with no specific training, extension springs are possible to replace. Replacement springs will generally 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 maybe not
If your garage door starts going down, then stops and goes back up, accompanied by your garage door opener's lights blinking, you have a difficulty you on which you can work
Does your garage go down, then back up for no obvious reason? If you've carefully checked for an object in the way of the door and can't see anything, you may have bumped your stop/reverse lights out of alignment.
The motive the stop/reverse system is there is that it stops your door from closing when something is in its path. Examine your garage door opening and remove any thing that may potentially be blocking your garage door. It will more than likely prove successful.
If you've spent quite a period looking for the thing that is blocking your garage door and nothing seems to work, try cleaning the lenses of your stop/reverse lights with a paper towel. Possibly a bug or smear 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 issue with the logic board or the gear sprocket in your opener.
It is possible for a home owner to change both the gear sprocket and logic board. The difficulty is finding the right components and learning exactly how to replace each item. Sometimes life is better if you just phone a garage door technician to perform the replacement. They've served hundreds of people and they can help you too.
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Since garage doors do not fail to work very often, most people are caught unaware of what to do to get it fixed. Most people make some attempt to trouble shoot their issue before they give up and phone a garage door company. Hopefully this article has given you some insight into what items you can fix yourself and what items should best be left to a professional.