Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
There is a white plastic gear that moves a slide switch on the main circuit board. Spray the slide switch with some terminal/connection cleaner. This did the trick for me. The door stops moving because it doesn't sense movement.
Posted on Feb 01, 2015
Mine too did you get it fixed ?
Posted on Feb 13, 2011
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Posted on Jan 02, 2017
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