Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
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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Posted on Jan 02, 2017
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