March 12, 2009
Craftsman Model 139.53970SRT garage door won't close unless button is held, else it reverses back up. What is wrong?
Craftsman Model 139.53970SRT garage door won't close unless button is held, else it reverses back up.
Jimmy k
Expert
You need to align the beam on the door sensors. Adjust the sensors until the led glows steady. I am sending you an image to explain the blinks of the led on the motor unit and suggests how to align the door sensors.
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