Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
Press and hold the square button on the back of the opener for 8 sec. now anything you had program is gone. At this time nothing is programed into your opener. you must reprogram your new or old remotes you still have for this door. all you have to do is push the same button first on the back of the opener and then the remote you want to program within 30 sec. the lights will blink telling you its done.
Posted on Jun 20, 2009
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Posted on Jan 02, 2017
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