Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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My Liftmaster 373LM remote and wireless 377LM Keypad not working

My 373LM remote to my Model 3280 Garage Door Opener and 377LM wireless keypad started intermittently NOT working around mid-August, 2009. The one in my 2005 Camry also stopped working on the same days as the 373LM remote. It appears to be an interference problem in our area as my neighbor's also does not work on the same days/times. I have talked to various people (installer, Liftmaster, Verizon FiOs, State Representatives) and no one has any ideas other than they say it could be interference from the military transmitting at 390MHz...but my remote says it's supposed to be 315MHz. I'm at wits end! Some days it works, some days not; mostly not on weekends. Help?? I live in New Castle County, Delaware.

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  • Vince Heuser May 11, 2010

    Your remote definately operates on 315mhz and the military does not use this frequency. Does the wall button still work when the remotes do not work?

  • Chris Caldwell Aug 24, 2013

    Definitely solved the problem. Remote now works from 30 yards away. Liftmaster support line never offered this solution. Thanks!

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  • 118 Answers

You should have a small wire hanging down from the back of the opener. This is the remote control antenna wire. Strip off about and inch splice a wire to it. The connections is just twisting the wires together. Run the extended wire up to the ceiling and down the wall where the door is located. Most of the time in the top corners where the weather stripping is, there is a small gap. Slip the wire through the gap so the wire extends outside of the door. The key to this is getting the wire outside. 99% of the time this extension of the antenna will be enough to conquer interference issues. You are correct that you are running on 315mhz and the military will not affect it. Let me know if it helps

Posted on Jun 16, 2010

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Posted on Jan 02, 2017

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