Step 1.
Take all your remotes into the street and click them. See if someone elses door opens. If so thats the duplicate remote.
There may be a way to change the number on that remote. Open it. If thats true change the number. Then clear all your remotes from the receiver and reenter them again
To clear all remotes stick pin into small hole on wall unit for 5 seconds. The click pin in for 2 seconds and the overhead light will go on. Then hold down one remote ket untill light goes out.
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