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

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I have a shop with 4 openers, and all of a sudden all of them will not open with their remotes, but will open from the wall units.

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Check the small LED on the rear of the motor units and see if they are flashing rapidly. If so you have something is interfering with the radio signal. If you have added anything new in your shop it could be the problem.

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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I have Craftsman garage door opener model 139.53675SRT2.I have two remotes which all of a sudden will not work. Wall pad works, and keypad works. What gives?


1. Check batteries in the remotes.

2. Someone may have reprogrammed the opener without realizing it. Look at the instructions for the unit and follow directions on matching the remotes to the opener. This may involve setting some tiny DIP switches in the opener and the remotes.

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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.

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We had the same problem.  open the unit and checkt the connections.  we had a few loose wires and every time there was a vibration whether a low flying plane or a truck nearby the door went up.  My husband found a few of the wires had loosened up.

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