Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
He has a Chamberland opener, I believe it is a Sercurity+ just like mine.
Model 139.53754 with rolling codes.
My remote will not open his door. At least one time the door opened without my neighbor using his remote.
Is there a way to eliminate the rolling codes, lock in one security code?
I have cleared the remotes and reprogrammed but the light and/or the door opens when my neighbor uses his remote.
Distance to my neighbor 75'.
Anytime a door opens and/or closes by itself 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.
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 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.
Do the above check just to be sure. If your unit is more thaan about 2 years old (freq. 390) you CAN buy an older non security plus remote and program it to your unit. this should eliminate the neighbors remote operating your door.
HOPE THIS HELPS
Posted on May 29, 2010
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Posted on Jan 02, 2017
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