If your garage door sensors are clean it could be the alignment or the wiring.
Garage door sensors should be tested.
Check the sensors leds.
Garage doors may display a variety of symptoms if sensors need attention.
The second line of defense is a set of infrared sensors which should be mounted 4 to 6 above the floor on each side of the garage door frame.
Here s what liftmaster suggests.
Garage door sensors should be tested.
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.
Eve works as a certified coding specialist.
Each of the sensors mounted on the garage door has a led.
If any object blocks the path of the infrared sensors the garage door opener will not activate or will reverse if operating.
Check for incorrect wiring between the sensors and the garage door opener.
If the garage door fails to stop and crushes the box check the sensor alignment.
If the sensors are working the garage door should immediately stop closing and return to the open position.
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The latest garage door sensors are technologically advanced and even allow you to control the opening and closing through an app on your smartphone.
In this case check the alignment of the opener or better involve a technician.