Door must reverse on contact with 1 1 2 3 8 cm high object or 2 x 4 laid flat on floor.
How to adjust liftmaster garage door travel.
Sure the garage door opens far enough for your vehicle but not past the point where the bottom of the garage door is even with the header of the garage door opening.
This video demonstrates how to program the travel on a chamberlain garage door opener with a yellow learn button.
There are two types of adjustable down limit on liftmaster garage openers.
You can adjust the open position using both the black button for open up movement and purple or yellow button for down close movement.
Incorrect adjustment of garage door travel limits will interfere with proper operation of safety reversal system.
After any adjustments are made the safety reversal system must be tested.
How to program the travel limits for liftmaster chamberlain craftsman garage door opener with arrow type program buttons with a black button.