What should I do if the door will not close and the lights flash?
If the garage door opener will not close and the lightbulbs flash, the safety reversing sensors are likely not installed, connected, misaligned, or momentarily obstructed. Verify the sensors are properly installed, aligned, and free of any obstructions. (Page 38)
From the official Chamberlain Chamberlain Garage Door Opener manual, page 38
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