Liftmaster suggests them be placed no higher than 6.
Sensor lights are not on garage door.
Verify the wire connections are correct on the garage door opener.
Sweep the garage floors and look through the sidings to ensure that.
Adjust each sensor in small.
If the sensors are not.
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.
Unlock the lock button if your door control has a lock button it may have been turned on.
If your garage door sensors are clean it could be the alignment or the wiring.
Troubleshooting check if there are any objects impeding the door.
Safety sensors include two mounted sections one on each side of the garage door opening.
Check for incorrect wiring between the sensors and the garage door opener.
Here s what liftmaster suggests.
Check if the safety reversing sensors are aligned.
Bad sensors will not keep the door from opening and at least moving a short distance in the down direction.
Random flashing of that light is normal.
Cycle the garage door.
Make sure there is power to the opener.
Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not.
Loosen the small nuts that hold each sensor to the l brackets with a small adjustable wrench.
The lock button on the door control in on.
Cleaning and adjustment remove any debris dust or cobwebs from the electric eye lenses on each sensor with a clean rag.
I think you have a power problem and should start by checking the house circuit breaker.
Now that you have made sure there are no obstructions and that both sensors are aligned properly.
Loosen the nuts just.
Replacing your old sensors.