Can't break the sensor beams

I have two Chamberlin openers that are about eight years old. They won't close when the temperature is below 30F. I just figured the rails were tweaked a little bit from the cold. Releasing the door didn't help. The chain still wouldn't move. Troubleshooting the sensors, both have green lights and when I break the beam, they stay on. Breaking the beam will not cause one of the lights to go out. The doors worked all summer but I cannot say if the sensors were working. Any suggestions would be greatly appreciated.

Ensure nothing is physically blocking the door's movement, both inside and outside the garage. Look for ice buildup, debris, or any other objects that could interfere with the closing mechanism. Consult your Chamberlain opener manual or online resources to understand how to adjust the force settings. In cold weather, the opener might need more force to overcome increased resistance caused by the colder temperature. Use a silicone-based lubricant on the rails, hinges, rollers, and other moving parts of the opener and door mechanism. This helps reduce friction and ensure smooth operation even in cold temperatures. Check if the battery in the opener is low or needs replacing. A weak battery can affect the opener's power and its ability to function properly.