If your LiftMaster 8500W garage door opener refuses to close completely and reverses direction immediately, the issue is almost always caused by misaligned or obstructed safety reversing sensors (photo-eyes) located at the base of the tracks. Other common causes include incorrect travel limit settings or physical obstructions blocking the door path. Safety Warning: Keep hands and feet clear of moving door sections during testing. Verification: Check that both sensor LED lights glow with solid green and amber lights without flickering, indicating clear alignment.
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