After reading this thread, I realized I hadn’t even noticed the yellow and green sensor lights on the operational door’s sensors - so that was my first clue when I began to look closely at my door that wouldn’t go down = there were no sensor lights on that side. Thankfully we have 2 garage doors, so I could look at the operational one and deduct some conclusions. One door would raise with remotes, but would not go back down except with the wall switch held firmly till the door went all the way to the floor. Hopefully after you read this you won’t have the same problem in the future. This problem bugged me for several months. Don’t just assume that if the path is clear that the sensors are ok. If your garage door opens ok but won’t close then it’s possible the safety reversing sensors are not correctly aligned. When the green indicator light glows steadily, tighten the wing nut. Loosen the receiving eye wing nut and adjust sensor until it receives the sender’s beam.Loosen the sending eye wing nut and readjust, aiming directly at the receiving eye.If the green indicator light in the receiving eye is off, dim, or flickering (and the invisible light beam path is not obstructed), alignment is required. The sending eye amber indicator light will glow regardless of alignment or obstruction. The indicator lights in both the sending and receiving eyes will glow steadily if wiring connections and alignment are correct. The following comes from the User’s manual: ALIGNING THE SAFETY REVERSING SENSORS One of the sensors is a sending unit (shoots the light out) and the other is a receiver which ‘catches’ the light beam. In order for the safety reversing sensors to work properly they must be aligned correctly. Each time I’d discover nothing in the way so I figured the sensors were fine. Each time the door was having trouble I’d get out of my truck and check to be sure the path between the sensors was all clear. So at first I didn’t think the Protector System® was to blame. LiftMaster uses the Protector System® which projects an invisible light beam across the door opening and automatically opens the door if something/someone crosses it’s path. Years ago garage door openers were required to utilize safety sensors to prevent doors from closing on small children. The Protector System® Safety Reversing Sensors The Solution: Adjusting the Protector System® sensors fixed my problem and the door now operates correctly. However, the remote would not be able to close the door even if you held the button. Another clue to the mystery was if you held the wall switch the door would completely close. Sometimes it would close part way before stopping and reversing and other times it wouldn’t open at all. The Problem: The door would always open fine but then would have trouble closing. However, as you’ll learn below the solution to this problem was extremely easy to fix and something you should know for the future. So this winter when I started having trouble with my door opener I was a bit puzzled and frustrated. I like them so much because they work very well and last a long time. I’ve been a huge fan of LiftMaster Garage Door Openers for years. LiftMaster Garage Door Opener Won’t Close Door
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