Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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I don't know the keypad code...we just moved into the house. How do I reset it?

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To program the keypad, first unplug the garage door opener from the electrical outlet. Next, remove the nameplate from the console that the keypad plugs into and locate the program/operate switch. Flip the switch to program. Next, enter your desired four-digit PIN number into the keypad. Slide the switch back to operate, and plug the garage door opener back in. The keypad should be programmed.

Posted on Dec 01, 2009

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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.


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1 Answer

Sears Craftsman keypad model 139.53684 Moved into a new house and did not get the code. Is there a way to reset the code or do I just need to replace it.


Make sure the battery is good and if the keypad still works you do it 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.

Jan 03, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I need to reset my keypad, bought a new house...do not know the old 4 digit code, need to reset and set my own??


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 your keypad and key in any 4 digit code you like and press enter.

Jun 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Do not know the password of the Chamberlain keyless entry


Locate the smart/learn button on the end 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.

May 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Do not know the password of the Chamberlain keyless entry


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.

Mar 23, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener keypad


On the rear of the opener near where all those white wires go you will find the smart/learn button. Press and immediately release it and then walk over to your keypad and key in any 4 digit code you want and press enter. Should do it for you.

Jun 29, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How to change code


Take the cover off the back of the unit where you are supposed to install the batteries. The instructions should be inside the cover. Hope that helps.

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