You need to sync both. I have a LiftMaster. If you want to change the code on your keypad you need to open up the garage door motor compartment where the light is (mine is in the back). Press the learn button, within 30 seconds enter the new code on your keypad and hold down the enter button for several seconds until the light on the opener blinks to tell you it has learned the code. Test the new code to see if it works. If the new keypad code works, then try the remote. My remote will not work after I reprogram the keypad. If the remote does not work (check battery) then climb back up the ladder and press the learn button on the garage door motor again, press the remote button and hold down until the light blinks again and the opener has learned the new code. This process works when I need to sync my remote and keypad. Good luck, I hope this helps.
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If it is a wireless keypad you need to locate the smart/learn button which is near where all those white wires go. Press and hold this for 6 seconds. This will erase the memory and none of your remotes or keypad will work.
For the keypad: Press and immediately release the smart/learn button and walk over and key in any 4 digit PIN you like and press enter.
For your remotes: Hold down the button on your remote and then press and immediately release the smart/learn button. Do this for each remote.
On the garage opener that actually opens the door the one on the
ceilling has a green or orange button that is called the learn button
just press and release it you have 30 seconds to punch in a 4 digit
code and when your done press and hold the enter button until the
lights on the garage open blink once or twice then just press the code
again and it will open the door press enter once to reverse the effect
and and twice to stop the door completely.
I was having a problem with the remotes. Program one remote, and the other stops working and vice-versa. I found the solution to be as follows: Using 61LM single-button remotes for Lift-master WhisperDrive (belt drive) garage door opener, I set the dipswitches (find them by removing battery replacement cover) to identical settings in both remotes. Set the first dipswitch to the neutral (0) setting. Next -- and this is the important part -- press the learn button on the main door opening unit, and, while the small LED light is lit, press the button on ONE of the remotes. DO NOT REPEAT ON THE SECOND REMOTE. Upon doing this, I found that BOTH remotes at last worked. I then went on to program a keyless entry pad, which was accomplished by again pressing the learn button on the main unit, and then entering the number sequence I had chosen for my entry code on the keypad, and pressing Enter. Both remotes continued to function and the keypad functions as well.