Code Change

T501L5 opener.
The previous owner gave me a remote and I purchased a new one. I paired the new remote to the opener.
Now I find the new remote and the old one both open/close the door.
So pairing apparently doesn’t create a new secure connection which means that the previous owner or anyone else that had a working opener could still open my doors.
How do I get the opener to recognize only my new remote and ignore any other remote?

If the radio receiver has a Learn Button that you used to program the remote then you can usually clear the memory of the receiver by holding in the Learn Button for 10 seconds or so.

There is a radio button used to connect the remote but no ‘Learn’ button. I’ll try holding the radio button 10 to see but I have my doubts.