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How do you troubleshoot optical sensors on a liftmaster garage door opener.

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  • spinnerx2 May 09, 2010

    Are the sensors normally a closed or open circuit during normal state?

  • spinnerx2 May 09, 2010

    Thanks,
    That will help me determine if the sensors are bad.
    Have a good weekend, and Mother's Day.

    Pat

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  • Master
  • 8,197 Answers

Look at both sensors, located near the floor on either side of the garage door. If both sensors are steadily lit, there is no obstruction. If one is flickering, it means the two sensors are misaligned or something is obstructing their path. Remove any leaves, dirt, debris or objects around or in the path of the sensors to see if that fixes the problem. Next try tightening up the wing nuts that fasten the sensors to the wall to bring the sensors back into realignment.

If either light is out, check the sensor wires attached to the white and black terminals on the overhead motor unit panel. Make sure they are properly connected and that a short is not occurring. If this does not solve the problem, consider calling a garage door specialist.

Posted on May 09, 2010

  • Jyackle5
    Jyackle5 May 09, 2010

    The sensors are in the closed state when they are working correctly.

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