Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo
Posted on Mar 18, 2009
Answered by a Fixya Expert

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Garage door does not reverse

When an object is placed in front of the sensors my door still closes and does not reverse, The lights stay on on both sensors even when the beam is clearly interrupted. Is this a problem with the sensors or the circuit board? If it is the circuit board is it repairable without replacing the whole board?

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  • 3 more comments 
  • rgpartyka Mar 18, 2009

    With both sensors covered, lights stay on. If I disconnect the sensors at the opener the door reverses the way it should when attempting to close.

  • rgpartyka Mar 19, 2009

    Yes, that is correct

  • rgpartyka Mar 28, 2009

    Changed the sensors and works like new now. Thank you. FYI - it was the receving unit that was bad.

  • Jim London
    Jim London May 11, 2010

    Hi, Ok, just to be clear, as the door is traveling down, you disconnect the sensors and the door reverses as if an object was detected. Correct?

  • Jim London
    Jim London May 11, 2010

    Hi, you need to do some more troubleshooting. Do you have sunlight shining on one or both sensors? if you cover both sensors do you still have lights? As one is a transmitter and one a receiver you should be able to break the circuit. You can also open or short the circuit at the connections to determine if it is the sensors or the board. Let me know!

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Jim London

Jim London

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  • Posted on Mar 19, 2009
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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!

  • Jim London
    Jim London Mar 28, 2009

    Hi, I'm glad it worked for you, and I'm glad I was right on in my assessment!

    Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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

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