Track down the limit adjustment screws over the opener unit. These are usually labeled “up” and “down.” Most models have two smaller knobs or plastic screws over the side or again of the motor housing. Hunt for markings for example: When the door hits the ground and reverses instantly, the https://emiliotiuen.blogdosaga.com/38222406/5-easy-facts-about-chamberlain-screw-drive-limit-screw-described