If the light attached to the door opener mechanism blinks several times after the door reopens, this generally means something is blocking the sensors or that they've become misaligned.  The two sensors are generally clipped onto the door track about six inches from the floor. You can move them slightly with your hands to try to get them lined up.   Other possibilities include a broken cable that must be replaced, a track that is bent and needs to be replaced or a worn extension spring cable pulley that needs to be replaced.
1. The up-limit switch may need to be moved toward the motor unit. This switch is usually a simply touch-lever mounted on the end of the track near the motor unit, and if it is too far ​away, the motor will stop the door before it fully opens. The solution is to move the switch closer to the motor unit. This is a somewhat rare problem, and will usually show itself immediately after a new garage door opener is installed.
All measurements should be in feet and inches. Step 1, measure across the existing door or desired space for the width, then up and down for the height. The rough opening of your space should be the same size as the door. Step 2, measure the sideroom, which is the space beside your door. Measure the width of the left side, and then the width of the right side. Step 3, measure the space above the door, which is called the headroom. Measure the height of the distance between the top of the door opening and the ceiling. Step 4, measure the ceiling, which is called the backroom. You’ll need to measure the distance of the garage door opening toward the back wall of your garage. You should have 6 total measurements in all once you’ve finished measuring the space. Keep in mind that having an automatic garage door opener installed might call for additional backroom or ceiling space.
If you have a steel door, but want the look of a wood one, it is not necessary to change your entire garage door. Often, it may be possible to mimic the look of wood with skillful painting. Your local home improvement store may be able to provide good advice about the type of paint and brushes needed to mimic the look of wood for your particular door material.
One of the last safety features on a garage door system is the manual release mechanism. Designed to disengage the garage door from the opening system should entrapment, a power outage or other malfunction occur, the manual release mechanism is most commonly found on the track that runs from opener to the garage door. It’s usually a bright red handle that should hang no higher than 6 feet off the ground.

Door styles - in addition to the styles just mentioned, it is important to also consider additional features such as windows across the top of the door to provide light inside of the garage, the use of steel or wood frames to give decorative doors added security and stability, and insulation which can reduce energy costs in the attached garage by an impressive 15 to 20%; and

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