Here s what liftmaster suggests.
Garage door sensor receiver led dim.
Check the sensors leds.
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Check for incorrect wiring between the sensors and the garage door opener.
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.
Each of the sensors mounted on the garage door has a led light located at the outer side.
The latest garage door sensors are technologically advanced and even allow you to control the opening and closing through an app on your smartphone.
Fixing an issue quickly is important.
Even a spider building a thick web near a sensor can cause that sensor to read that something is in the way.
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This is something to consider if you decide.
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.