When a garage door opener light flashes or blinks while the door refuses to open, it is almost always indicating a safety reversing sensor (photo-eye) alignment issue, blocked infrared beam, or damaged sensor wiring. Because modern safety regulations require the optical sensors to confirm a clear path before allowing the motor to drive the door downward, any interference prevents operation and flashes a diagnostic code. Callout type="warning" title="Safety Warning": Ensure the door path is completely clear before testing. Verification: Check that both sensor LED lights glow with solid green and amber lights without flickering, indicating clear alignment.
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