How to Troubleshoot LiftMaster 87504-267 Error Code 4-6

📺 Troubleshoot Error Code 4-6 on LiftMaster 87504-267 garage door opener. Watch this video to learn how to fix sensor alignment issues and ensure your garage door closes safely.
📖 In 5 steps:
1. Error code 4-6 indicates that the garage door opener will not close.
2. This error is triggered when the safety reversing sensors are misaligned or obstructed.
3. Realign both sensors to ensure both LEDs are steady and not flickering.
4. Make sure nothing is hanging or mounted on the door that would interrupt the sensor's path.
5. Ensure the safety reversing sensors are properly installed, aligned, and free of obstructions.
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📚💬 Manual and other questions:
On our site, you can find the complete manual for the LiftMaster 87504-267. There, you can also ask your question to other LiftMaster 87504-267 users.
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[@savagefist1029]

My problem is one of the sensors is not getting any power. I thought it was a bad sensor, replaced it and the new one also has no light so it is not just an alignment issue.