If your garage door sensors are clean it could be the alignment or the wiring.
Sensor lights are not on garage door.
Adjust each sensor in small.
I think you have a power problem and should start by checking the house circuit breaker.
Here s what liftmaster suggests.
If the sensors are not.
The sensors use two photo eye lenses that transmit an infrared beam between them.
Loosen the nuts just.
Verify the wire connections are correct on the garage door opener.
Liftmaster suggests them be placed no higher than 6.
Check for incorrect wiring between the sensors and the garage door opener.
Cycle the garage door.
Cleaning and adjustment remove any debris dust or cobwebs from the electric eye lenses on each sensor with a clean rag.
Make sure there is power to the opener.
Bad sensors will not keep the door from opening and at least moving a short distance in the down direction.
Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not.
Replacing your old sensors.
Sweep the garage floors and look through the sidings to ensure that.
Safety sensors include two mounted sections one on each side of the garage door opening.
Random flashing of that light is normal.
Light doesn t activate on garage door opener when you cross safety sensor beam chamberlain group products which include the liftmaster chamberlain sears craftsman line of garage door openers have a feature where the opener light will turn on if you cross the safety sensor beam shooting across the opening of your garage door.
The lock button on the door control in on.
Even if there are no evident signs of dust on.
Follow these easy steps there isn t a solid light coming from the safety eye sensors.
Loosen the small nuts that hold each sensor to the l brackets with a small adjustable wrench.
Now that you have made sure there are no obstructions and that both sensors are aligned properly.