Clear out the area around the doors. Rakes and shovels should be kept away from the paths. Small objects should be kept off the ground from any sensors at the ankle that could accidentally get in their path. Hand-tighten your obstacle sensor's aim before you go on vacation. Next, wipe off any cobwebs or sensor blocking leaves that may be caught by the sensor. You can set some openers to shut every night, even if they are open until 9 p.m.