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As you may know by now there are keypads and then there are keypads. They must be made to work together as there are some that are not compatible. Posting your model numbers might help a little.
The correct keypad for your opener is 139.53684. The 53876 keypad is an older technology and will not work correctly. If you program it you will find your remotes no longer work and if you reprogram your remotes the keypad will not work.
If the following instructions don't work and you have a good battery the keypad has failed.
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 your 4 digit code and press enter.
I don't know this model. (in australia). the chamberlains here are probably the same. the 4 digit code you first put in the keypad is what you have to use. push the learn button on your operator then punch in your 4 digit No. Hold the enter button on your keypad until the light flashes on the operator.
That should code it in.
freddy51
If both units were manufactured before April 2005 or both were manufactured after that date they should work. If one is older and the other newer than that date they will not work with each other.
If you have a wireless keypad do this: On the back of the motor unit just to the left of where all those white wires go you will find the smart/learn button. Press and immediately release this and then walk over and key in any 4 digit code you like and press enter. Should do you.
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