A blinking or flashing diagnostic light on a Chamberlain garage door opener typically indicates a safety reversing sensor (photo-eye) alignment issue or obstruction. If the diagnostic LED on the motor unit flashes a specific number of times (such as 10 flashes), it points directly to blocked, misaligned, or faulty sensor wires. A blinking wall control or opener light can also signal low backup battery power or active programming modes. 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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