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

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Sensor light what dose it mean when one light stays on even when you place hand in front of the other one works fine.

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I assume you have a Craftsman or Liftmaster operator and you are talking about the photo eyes (sensors). If this is true thanone light will remain on if there is power to it and the other will go out when the photo eye beam is blocked or are not lined up.

Thank you for your your question bry4man. I look forward to answering any more of your questions.

Posted on Jan 03, 2009

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Posted on Jan 02, 2017

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Hi again, Thank you for getting back to me, this indicates that the main unit is OK and one or both of the sensors is bad. The basic principle of the safety circuit is that the circuit is complete or connected until broken by an object, There are several different types of sensors the most common is an led transmitter on one side and an optical receiver on the other, which shines a beam of light that requires the sensors to be aligned to "see" each other. The light on the sensor indicates that it sees the beam and if you wave your hand in front of it, it should go out indicating that it doesn't thus breaking the circuit. The light constantly on indicates something shorted in one of the sensors. You could probably hook them up one at a time to see which one might be at fault but then again you would want to replace them as a pair, and a new pair of sensors should put you back in working order. Good Luck, this should Fixsya!

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