Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

1 Answer


Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Contributor
  • 504 Answers

If you go to they have a chart that will tell you all accessories that will work with your system.

Posted on May 04, 2015


2 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 1 Answer

SOURCE: I have a Chamberlain garage door opener -

2011 - China's industrial door industry by 2015 dynamic focus and investment prospects for many years research report forecast on the system of industrial door machine industry, combining industrial door industry observed throughout the change law of supply and demand relation in the industry, industrial door of enterprise group makes a thorough investigation and study, through to the industrial door industry environment industrial door industry chain work

Posted on Apr 01, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do I program garage door opener remotes

The remote typically can be programmed by removing the battery cover and accessing the back of the chip that should have a few switches you can program it with.
Luke '

Jan 19, 2014 | Craftsman 1/2 HP CHain Drive Garage Door...

1 Answer

I can't successfully install my new logic board. I'm replacing board 41a5021-3c with 41a5021-2g. I was told i need to do this so I can operate 2 vs 1 remotes. I'm hooking up wiring the same way...

Something is strange here. With the original logic board you should not have a yellow wire and there is no reason why you couldn't use 2 remotes. It would help if you would post the model number of your opener plus the model numbers of the remotes you want to use. It is very important that the remotes are the correct models for your opener. You seem to be getting false information but there may be something I don't know yet.

May 17, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Keypad 976lm won't learn if other remotes are already "learned". Will only learn if memory is cleared and then standard remotes won't learn. Unit is a 1265LM Liftmaster.

It sounds like that keypad did not come with the opener but was an earlier model. Make sure the keypad is one that is listed as compatible with the opener.

Sep 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer


This is the most difficult question to answer because technologies and frequencies have changed and there is not a good way to check. If you program the opener to this remote and your other remotes quit working or if it will not program at all then you know the answer.

Dec 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Only one remote programs

It is really important to that you have the correct remotes for your opener. The model number is on the end closest to the door and starts with 139.

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

1 Answer

Need device to operate more remote controls

The memory is limited and I think it is about 5 remotes including the keypad but there are older openers that are backwards compatible and will work with remotes with 9 position dipswitches. One model I am familiar with is the Liftmaster AD 800. You will have to call around to companies that handle Chamberlain and Liftmaster to see if they still have one. They will work with unlimited remotes as long as the switches are set exactly alike.

Sep 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I can't get my old remote to work with my new garage door opener

buy new remotes. New opener is 315 mhz, old are 390 and not compatible,

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

2 Answers

Garage door opener remotes

Guest- You opener is locked. Hold down the lock button on the wall control for 3 sec. and it will unlock the opener.

Jul 14, 2008 | Sears Craftsman LiftMaster Chamberlain...

9 Answers

Trouble changing passwordon model 940CB wireless keyless entry

easyer then that , you die! Open your garage door, take out the step ladder, a chair or get up on *********** in law's back, (here's your chance to be on her back for a change) press the read button of your unit (motor) a led should light up and on the key pad, key in the new 4 digits code and press enter, the light of the unit should blink javascript:; Post Solution

May 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

Not finding what you are looking for?
liftmaster Chamberlain Garage Door Opener Transmitter 300MC Logo

371 people viewed this question

Ask a Question

Usually answered in minutes!

Top liftmaster Electrical Supplies Experts

Vince Heuser

Level 2 Expert

118 Answers


Level 1 Expert

28 Answers

ray gallant

Level 3 Expert

51165 Answers

Are you a liftmaster Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides