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Garage Door Not Closing? Check this out

If the garage door goes up but goes down only when you hold down the wall switch, check to see that the safety sensors are in alignment. The small light on each sensor should be lit up when nothing is between them. Door sensors do go bad, so if no light is showing at all, you may need to replace them. You can save yourself some time by using the existing wires. Also, direct sunlight shining on sensor eyes can make them misbehave.

Read more: http://www.familyhandyman.com/garage/troubleshooting-garage-door-openers/view-all#ixzz3StTIxP64