Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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I have a Chamberlain Liftmaster garage door opener that is less than 2 years old. Just recently, it began not closing--it would just go back up after going down a short ways. It would open MOST of the time. It didn't matter if I was using the remote or the wall button. NOTHING is blocking the sensors. One of the eye sensors is green, the other is yellow. A contractor installed it and I do not have any paperwork on it. Please help....being cold & winter still, it is tough to operate it manually. I miss it automatically opening with a touch of a button.

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Have you tried lubricating the rollers in the tracks, as well as look for excessive wear marks in tracks that rollers run in, just in case it's binding in an area, due to lack of lube, or improper alignment,most likely on a curve or bend. The opener may have the feature built in that causes the door to go back up if excess resistance is felt when coming down, as a safety feature to protect against something, someone, getting trapped under door. Make sure you unplug or shut power off to it while inspecting to be on safe side.

Posted on Mar 15, 2011

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