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

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I have Liftmaster lifts on both of my two car garage doors. One works just fine but the other one only works when you press the wall button and hold it down until the door is done moving. Otherwise it will reverse, acting like something is in the way of the seeing eyes. So far I have: 1) Cleaned the glass eyes. 2) Turned the sensors to zero sensitivity. 3) I have tried to align the eyes on the bad one. The light on one side is on all the time, but the other side is randomly on. It is VERY hard to get it to see the other side. I have it lined up now, but as soon as you press the button to let the door down, the light starts to flicker. Is it possible that the eyes sight sensors have just gone bad? Maybe the door is out of alignment and causes the eye to move once the door starts. Any clues how to get it to work? I know the system CAN work, because every now and then when I push the remote, the door will actually go down about 1/3 of the way before stopping and reversing.

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One of your sensors is moving and you need to find out why and correct it. The light flickers when the sensor is on the edge of the beam sent by the other sensor. Think of it as a flashlight.

Posted on Dec 31, 2010

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It sounds like the lock function has been toggled on. Press and hold the button on the wall control with the lock icon for 3 seconds. This will toggle that function off.

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