Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Garage door opens/closes by neighbor

Not the double main door but only the single door opens and closes when they use their single door. We did just code my wifes car buttons to that door last week and now we have this?

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Your code may be teh same or close to you neighbors. I'd change to another code. Takes 5 minutes

Posted on Jul 29, 2009

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Posted on Jan 02, 2017

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Garage door opener.model 139.3043


Chances are pretty good if you simply replace your old garage door system with a new one, you would not be entitled to any compensation.

If you want peace with your neighbors, just replace the old system and call it good.

If you can't replace it right now, or you really want the neighbor to take responsibility, then I would recommend that you send a letter to the neighbor that outlines the problem very specifically and inform them that they cannot continue to open your garage door and leave it it open because you are concerned about the pipes freezing and about intruders breaking in. Remind them that this problem did not exist until they installed their system and you would really appreciate their assistance in getting this problem resolved.

You do not have a cause of action against the company that installed their garage door system because you didn't have any type of contract with them. You do potentially have a cause of action against the neighbor. Have you considered having an independent garage door installer come out and assess the situation? Just because the tech from the original installation company was clueless doesn't mean another company wouldn't be able to fix this.

Jan 17, 2014 | managemylife.com

1 Answer

Our remotes (2 for the car and a keyless entry) stopped working. We erased everything (and checked to make sure our remotes weren't working) and reprogrammed all remotes. They work, but our neighbor's...


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.

Nov 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I really need your help. My Craftsman unit model number is 139.53615SR manufactured 1/92. I have a three car garage. The original two remote controls were lost and since then I've used the setting in my...


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.

Oct 25, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Craftsman 139.53673SRT garage door opener. When I try to close door with remote or single push on doorbell control, the door reverses after 6-8 inches of travel - and big bulb flashes 10 times. ...


When the main light flashes 10 times and the door reverses it is a door sensor problem. Make sure they are pointed at one another and that the small light on each one is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have a bad sensor or wiring.

Aug 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door is opening when the neighbor open theirs with remot


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.

Aug 27, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opened by neighbor


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.

Jun 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

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