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