Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
It sounds like you have a Security + opener and one of your remotes has reverted to the billion code technology. You will need to purchase a new remote with the same model number and then you will find that 2 of the remotes will program just fine. It will take trial and error to eliminate the bad remote. I suggest you remove the battery and discard the bad one.
Posted on May 27, 2010
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Posted on Jan 02, 2017
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