There are two main varieties of springs, torsion and extension. Extension springs go along the tracks parallel to your ceiling. Torsion springs are wrapped about a bar that is on top of your garage door opening.
In the majority of cases if one of your springs is broken it will be totally 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 attempt to open your door yourself. It might lead to injury.
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If you have extension springs and one of them is not working, you may be able to find a replacement and replace it yourself. However torsion springs are another matter. If you have a broken torsion spring you ought to phone a garage door company to do the repair unless you have been specifically educated on replacing torsion springs.
While numerous garage door repairs need a trained technician to perform the repairs, there are some things that a home owner can successfully work on. One of those items is the stop/reverse lights.
By far the most universal sensor that stops and reverses your garage door is a set of "eyes" that are situated toward the bottom of your garage door’s track on either side of the door.
Does your garage go down, then back up for no visible reason? If you’ve carefully looked for for an object blocking of the door and can’t see anything, you may have bumped your stop/reverse lights out of alignment.
The chief cause that your door will stop and reverse is that your "eyes" are working just as they are designed to. There is something blocking your garage door. Sometimes whatever is blocking the door is not evident, so carefully look around your garage door opening. Eventually you’ll figure out what it is.
If you’ve spent quite a time 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. Maybe a bug or smear has gotten on the lense.
The root cause could be your garage door opener unit. Although they are extremely trustworthy, issues can easily fail with them. The two major repair gadgets with the opener unit are the gear sprocket and the logic or circuit board.
If your opener is the problem you will be pleased to know that you probably do not have to replace it. Parts are accessible to garage door technicians who can repair your opener at a fraction of the price of a new opener.
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One of the nice things about garage doors is that they are extremely reliable. Most homeowners go years and years without a problem. That means that when a problem does develop, it is often a new experience for a home owner. With any luck your repair will be simple and the cost reasonable. Good luck!