Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Just bought home with 1/2 horse openers. don't have code for exterior keypads.have remotes.

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Hello. There is a procedure whereby you create your own codes for the exterior keypads. Go to this link, select your style of keypad and you will have the step-by-step instructions you need. J.

Posted on Jul 10, 2010

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Posted on Jan 02, 2017

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We bought a house with this lock and don't know how to cancel the previous code and start a new one. We don't know how many digits to put in for the code.


To change your code:

1. Remove the inner cover plate from the lock.

2. Locate the small round reset button near the left side of the circuit board (Red or Black).

3. To program, press the reset button once, then enter your 4-8 digit code on the exterior keypad, then immediately press the middle lock button on the exterior keypad. You will hear a beep. This signals that your code has been accepted.

4. To enter a second code, follow the same procedures as in step 3, but this time press the reset button twice then enter your code.


hope this helps

John

Sep 16, 2011 | Weiser Lock Powerbolt 1000 Lock

1 Answer

Bought house with craftsman garage opener. Owner only had one remote. Bought a new remote at Sears that matched color code. followed instructions to code remote...that worked but made the old remote non...


Post the model number of the opener and the model numbers of the remotes. The opener model number is found on the end closest to the door and starts with 139.

Try programming the keypad like this:

Locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this and then walk over to the keypad and key in any 4 digit code you like and press enter.

After programming the keypad see if either remote will work with it. Post this information also.

Oct 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

I programmed 2 new remotes with no issue but, cannot get the remote keypad to reprogram (we just bought the home and don't know the existing code) the model for the garage door opener is Chamberlain...


Your keypad may be bad. If you press and immediately release the smart/learn button and then key in your 4 digit code and press enter the keypad should be working. Be sure you have a good battery. Actually the flashing of the keypad is indicating that it is sending the signal to the receiver. Holding the enter button in doesn't do anything extra.

Nov 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens randomly then closes


This is most commonly caused by a bad wall control, the wires going to it or a remote with a shorted switch. You must use a process of elimination. Heavy dew or rain will not cause this.

Oct 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Code Remote and other remotes do not all work at the same time.


Either your keypad has reverted to an earlier technology and will no longer work properly with your opener or you have the wrong keypad. Either way take the model number off the main unit and get the correct keypad.

May 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Reprogram keypad with new code


Here is a link that will give you the programming instructions for your model.
Use the model number from the motor unit, not the remote. I believe that Craftsman now goes under the Liftmaster name.
http://www.garagedooropeners.us/helpgifs/maincode.html
Mike

Apr 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener doesn't work with key pad or remotes


It sounds like for some reason the receiver has lost the stored codes for your remote transmitters. The wired button goes right to the opener so it continues to work.

On the back of the opener you'll see a small pushbutton. Press it and the indicator light nearby will come on. While this light is on, press the button on your remote. The light will go out and the code is stored. Repeat this for each remote. The process is the same for the keypad, except that you need to enter your desired 4-digit code.

If this programming doesn't work you'll need to replace the receiver board. Like any other piece of computerized equipment, it can fail or be damaged by power line problems. But try reprogramming first, as that's the most likely solution.

If this has helped you, please take a moment to rate the solution. Thanks for asking here!

Feb 18, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

TRANSMITTER IS "DROPING" CODE


This is a very rare condition that I have come across. I believe it's related to a power surge. Replace back-board.
The only other thing I have seen is that someone will replace the opener and not replace the wall button and you only have a doorbell type button instead of the wall button that came with the newer system which has 3 buttons on it one of which is 'lock'.
When the button is flashing the opener is in 'lock' mode and won't 'listen' for any remote control at all (incase your on vacation and someone is trying to hack your opener code) but the wall button will still work.
You need to reprogram the keypad again like you reprogrammed the remotes.

Jul 01, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Reprogramming remotes/system


Yeh, it is called reading the manual. Push and hold LEARN or SMART button for 10 seconds, Release, Push for 1 second and enter keypad code and ENTER, Kight bulbs should blink. Hit learn again for a second and push a button on a remote. Repeat for all remotes.

Apr 17, 2008 | Sears Craftsman LiftMaster Chamberlain...

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