Incorrect limit change settings: Garage door openers use limit switches to control how much the door travels up and down. If these are off, the door may well not near entirely. Garage door openers normally have two limit adjustment screws or dials labeled “Up” and “Down” to the motor housing. https://raymondfviue.luwebs.com/39057949/not-known-details-about-liftmaster-screw-drive-travel-limit-setup