Here s what liftmaster suggests.
Garage door sensor receiver led dim.
Even a spider building a thick web near a sensor can cause that sensor to read that something is in the way.
If the green led on the receiving sensor is off dim or flickering and the invisible light beam path is not obstructed alignment is.
Put on the electric power supply and look at each led on both sensors.
Sometimes the sensor may be beyond repair due to wear and tear and in such a case your best bet is to replace the garage door sensor with a new one.
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This is something to consider if you decide.
Fixing an issue quickly is important.
Check for incorrect wiring between the sensors and the garage door opener.
If your garage door sensors are clean it could be the alignment or the wiring.
The latest garage door sensors are technologically advanced and even allow you to control the opening and closing through an app on your smartphone.
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Among the easiest issues to solve are objects blocking the sensor beam because garage door sensors rely on infrared technology to see if something is in the way of the door s operational path that path needs to be unobstructed.