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

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I have a Craftsman ( Liftmaster) door opener that all of a sudden one night opened our door by itself. I closedd the door and in a few minutes it opened again. It continues to do this at random times. I have disconnected the wall console, reprogramed the codes and isolated the three remotes with batteries removed to eliminate them as a cause. I believe it may be a logic board problem. Any other ideas?

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Make sure it isn't the wiring to the wall console by removing the connection at terminal #1 on the end of the motor unit. Staples used in installation can cut through the insulation and cause this problem.

Posted on Apr 06, 2011

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