Next clear the beams of any dust debris and or cobwebs that may have accumulated on the sensor lenses.
How to check liftmaster garage door opener.
Hold down a button on your remote garage door opener.
Within 30 seconds of pressing the learn button press down on a button on the remote.
Under the front light lens under the left light lens if facing the garage door opener opposite side of where the antenna is on the garage door opener tip.
In the future when the unit receives that specific signal it will open the garage door it s attached to.
Locate the manual force adjustment dials at the back of the liftmaster garage door opener.
They are usually blue in color.
Firstly make sure there are no obvious obstructions.
Repeat step 2 if the garage door.
Increase the opening force setting slightly.
If you notice the door reverses when closing you want to check the sensors first.
This will send out a radio signal to the ceiling mounted motor unit.
Whether you have a belt drive chain drive or wall mount model find helpful resources manuals videos and more to help you diagnose and fix the problem.
Also check to see that they are as aligned as possible.