Door reverses fully open after hitting the floor instead of staying closed.

Safety first: Keep clear of the moving door while testing adjustments.

• Inspect floor and door bottom: Look for raised concrete, weatherstrip, or objects that cause the door to stop abruptly. Correct or remove obstructions.
• Reset down limit: Adjust the down travel limit on the Mighty Mule opener so the door stops just as the weatherstrip contacts the floor, without significant compression.
• Fine-tune force: Adjust the close force slightly per the manual. Too low can cause premature reversal; too high can be unsafe.
• Test multiple cycles: Run the door several times and confirm it stays closed without reversing. Perform the 2x4 safety reversal test to ensure proper operation.