Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Liftmaster 1/3 HP. Remote and wireless keypad stopped working.

Door works fine using wall button. Remote and wirless keypad stopped working at same time. Changed both batteries and no help. Followed instructions for resetting remote code and still no work. Light next to button on motor unit blinks 3 times (usually) when trying remote. Again, door fine using wall button.

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Sounds like the reciever for you wireless devices is not working?

Posted on Aug 02, 2009

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The LED flashing 3 times is the code for a bad wall control. You can easily verify this by removing the wire from terminal 1 on the rear of the motor unit. If your remote and keypad start working you will know the wall control is bad.

Posted on Aug 03, 2009

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1 Answer

I have a liftmaster formula 1 1280R opener that works fine from the wall mount but all of a sudden both remotes and the built-in remote in my car stopped working. It is not the batteries in the remotes. ...


The motor/control unit may have gotten reset. It needs to relearn the codes transmitted by the remotes.

MIne has a "learn" button on the control unit. Press and hold, then press the button on the remote. Lights will flash indicating it has received and stored the code. Release button.

Check to see if the remote works now. If so, all three should be working. If not, dig up your manuals.

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Your wall control is hard wired and doesn't use the receiver portion of the logic board. The remotes do. Your receiver is going bad.

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reset your remotes and your main transmitter after removing and replacing the remote batteries (these use rolling codes that change each time you operate the door) the procedure for doing this is listed on the liftmaster website

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Does your wall console have a LOCK or VACATION setting. Turn off.

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Does your wall switch have a lock feature? By pressing the lock button, the remote control is disabled. A flashing light indicates this feature has been activated.

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