When a LiftMaster 8500 garage door opener light or diagnostic LED blinks 9 times, it typically indicates an issue with the Protector System safety reversing sensors (photo-eyes) located near the bottom of the garage door tracks. A 9-flash error code means the sensors are misaligned, blocked by an obstruction, experiencing wire interference, or suffering from direct sunlight blinding the receiving eye. Callout type="warning" title="Safety Warning": Ensure the garage door path is completely clear before testing or operating the door. Verification: Check that both sensor LED lights glow with solid green and amber lights without flickering, indicating clear alignment.
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