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Well if your garage door has a sensor to make sure nothings in the way check the sensor. There may be something in the sensors range so it wont let the door close. The sensor is usually a small box at the bottom of the door with a red laser coming out of it, though you can only see the laser right in front of the sensor.

If its not the sensor there may be something wrong with a different part, so you should call Customer Service, they might walk you through it.

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Q: Why After replacing gear on craftsman garage door opener door only moves one foot then reverses?
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