Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Door does not close comes back up, light flashes
Check to make sure your door sensors have not been bumped out of alignment. Each has a small light that should be lit when they are properly aligned. Tweak them a bit and see if the lights are lit. If both lights won't come on you have a bad sensor.
Posted on Oct 02, 2009
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Posted on Jan 02, 2017
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