Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

1 Answer

My neighbors remote opens my garage door too!

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  • cgrayflorida Jun 28, 2009

    my remote is model #365lm. its an add on universal receiver.

    sorry for the confusion. no dip switches in this unit.

  • Anonymous Mar 14, 2014

    Help,my neighbor is opening my garage door

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Open your remote and there are dip switches that you set to be either on or off. Set them to any sequence you want, but you need to set the dip switches on your main unit to match the ones on your remote. For example: 1 off, 2 on, 3 on etc. Set the main unit to 1 off, 2 on, 3on and so forth.

Posted on Jun 28, 2009

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Posted on Jan 02, 2017

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I would recommend this. I'm not sure this will work, but I think it will.
Try starting from scratch. Reprogram the unit to the car again, I think the codes change each time it is done. If not, it's not too difficult to try.

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Make sure your neighbor doesn't have a remote with a sticking switch. Often times a person will stick an extra remote in a drawer and then place something on it that holds the button down. Try programming your remotes this way just in case you didn't.

Press and hold the button down on the remote while you press and immediately release the smart/learn button. Sometimes it can help if you are in the garage when you program your remotes this way and it will drown out any distant signal.

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Have your neighbor bring over his remote and open or close your door with it. Then hold the smart/learn button in for 6 seconds on your opener. Then see if he can open your door. He shouldn't be able to because that procedure erases the memory in your opener. No remotes should work. You need to get that remote #53778 back and program it and then see if your neighbor can open your door. If he can open your door at any point after you have held that button in for 6 seconds you need to get a new door opener.

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You say you "setup the remote and the main box but doesn't solve." I think you mean you programmed the unit but I'm not sure. Anyway try holding the smart/learn button in for 10 seconds and this will erase the memory. None of the remotes should work. Now when you are sure the neighbor will not be using their opener, program your remotes. This may be what you did but I'm not sure.

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I have a feeling your neighbor operated their door opener when you were programming your new clicker. Try erasing the memory of your opener and then program the clicker again making sure your neighbors do not operate theirs at the same time. To erase the memory hold the smart/learn button in for 10 seconds.

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1 Answer

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Have you seen the neighbor open your door? The reason I ask is because it is almost impossible. The most common cause of a door opening by itself is a bad wall control or the wiring leading to it. You can temporarily eliminate both possibilities by removing the wire from terminal 1 at the rear of the motor unit. Do this and ask your neighbor to bring over his remote and try it on your opener.

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Hold down learn button for 8 seconds. This clears the memory for all remotes. Then reprogam your remotes

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