Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
The problem might actually be the door itself. make sure it raises and lowers easily and is well balanced. If it is then find the power adjustments and turn up the up force to work the door. Do a 2x4 safety reversal test afterward. Thanks BB
Posted on Sep 03, 2010
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Posted on Jan 02, 2017
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