Door will not stay closed; it travels down then immediately reverses to open position.

Safety first: Keep clear of the door path while testing. Do not stand under the door.

• Inspect floor and threshold: Look for objects, raised concrete, or weatherstrip that the door is hitting before fully closed.
• Check door arm and bracket: Ensure the curved door arm is securely fastened to the top bracket and the opener trolley. Tighten loose bolts.
• Adjust down travel and force: Increase the down travel slightly so the door can reach the floor, then adjust down force just enough to prevent nuisance reversals while still reversing on a 2x4 test.
• Check for binding: Move the door by hand to ensure it does not bind near the floor. Correct track or roller issues before increasing force.