You can also get remote units that connect to the same terminals that you would hard wire a button to. You really do want a later remote, as they all now use rolling code technology. Essentially you have to "invite" a remote and the unit and remote agree on a code. From that time on, the code changes every time that you use the remote (automatically, you do nothing). Way better security, and a guy cannot just run a frequency generator and open your door.
Anytime a door opens and/or closes randomly or doesn't work consistently I look for a smashed wire between the motor unit and the wall button.
If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote signal.
Loosen the staples with a small screwdriver and slide the wire about ?½ inch to move any areas of thin insulation away from the staples.
The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone's purse that gets the button pushed by other stuff in the purse.
The test is to disconnect the push button wires at the power unit. If the self operation / interference stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button is defective..
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