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

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Garage Door won't close!

Hi, My garage door won't close. When the garage door is closed and the trolly is engaged, it has no problem opening. But while the door is open, the trolly only travels about a foot, then reverses. It does the same thing even when the door is not engaged with the trolly.

Any suggestions? I've tried messing around with the sensors, everything looks good and the door opens and closes manually without any binding.

Thanks,
David

Posted by on

  • dacamovic Sep 09, 2009

    Hi Don, thank you for your prompt response. I've checked and the main light does not flash at all, and the light on the sensors have a constant light. I've also played with the down force, and no change.

    Even with the door disengaged from the trolly, the trolly only moves forward about a foot and then back to its original position.

    If it is the RPM sensor, is that replaceable?

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If the main light flashes 10 times when the door reverses it is a problem with the door sensors. Make sure the small light on each sensor is lit and not blinking ever so slightly. If it doesn't flash it is most likely the RPM sensor which is a small printed circuit board just in front of the motor. There is also a possibility that the down force needs to be increased. This is a control on the rear of the motor unit near where all those white wires go. Increase it about a quarter turn.

Posted on Sep 09, 2009

  • Don Maggard Sep 09, 2009

    Yes the RPM sensor is easily replaceable. You can get one at any good door repair companies in the yellow pages.

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