Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
They really aren't critical. You should be able to just eyeball them. You may have a bad sensor if you are having trouble. One of them is the sending unit and the small light is on all the time. The other is the receiving unit and the light will only be on when they are pointed correctly. The receiving unit is also the one that quits working usually. If neither light is on you may have a wiring problem.
Posted on Sep 30, 2009
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Posted on Jan 02, 2017
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