Garage door closes and then immediately opens again without any obstruction present.

Safety first: Keep clear of the door while adjusting travel settings.

• Inspect floor and door bottom: Look for raised concrete, thick weatherstripping, or a warped door bottom panel that could cause extra resistance at the end of travel.
• Adjust down travel: Reduce the DOWN travel on the Craftsman opener so the door stops just as it contacts the floor without pushing hard.
• Check door arm: Ensure the curved door arm is securely fastened to the door bracket and the trolley. Tighten any loose bolts.
• Test reversal: After adjustment, close the door and verify it stays closed. Then perform the 2x4 reversal test to ensure safety features still function.