You cannot change the code of your remote or opener. It is set at the factory. If you have lost or have had a remote stolen and need to eliminate its possible use you can erase the memory of your opener by pressing and holding the smart/learn button for 6 seconds. That button is on the back of the motor unit near where all those white wires go. Now you need to program your remote by holding the large button down while you press and immediately release the smart/learn button.
SOURCE: How do I code the garage door wireless key pad?
simple ;find the smart button on the opener and pressit ,their will be an indicater light next to the smart button that will remain lit ,then go over to the keypad and put your 4 digit code in example1234 then press enter on keypad and hold down for 3 seconds until garage door opener lightbulbs shut down and come back on , and thats it simple as pie! when the lights go on and off on your machine it,s telling you that it has received the code that you just programmed into it , guaranteed to work everytime , Thank you for letting me help you Sincerely Glenn mayer
SOURCE: I have a craftsman garage door opener (1/2 hp) won't close proper
Check your door sensors. They have probably been bumped. Tweak them until they are pointed at one another and the small light on each one is lit and not blinking.
SOURCE: garage door opening/closing problem
Could be a bad wall button or a smashed wire.
Anytime a door opens and/or closes by itself, or remotes work intermitantly I look for a smashed wire between the motor unit and the wall button or a bad 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.
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.
HOPE THIS HELPS
SOURCE: I have Craftsman TX2028 remotes (139.53753) with
Make sure the green light in the wall control is not blinking. If it is, press and hold the 3 seconds the lock button.
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