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

1 Answer

Door reverses for no reason, 3 or 4 times, but finally closes

I bought this garage door open in Feb2009 and it's already not working right. When I click either the wall button or the remote to close it, it starts to go down, then reverses and comes back up for no reason. It does this 3 or 4 times then it finally closes.

I've already made sure there are no cobwebs or bugs on the sensors, and they are showing the right colors on the LED.

We have followed the troubleshooting guide and adjusted the force but that didnt help.


Thanks in advance

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  • 2 more comments 
  • Pandorra Jun 29, 2009

    Ok. Im a garage door idiot, what is the best way to re-align the sensors? The door is only 4 months old, I would hope a circuit board isnt bad already!!! As luck would have it, it's just out of warranty for labor

  • Pandorra Jun 29, 2009

    The main light does flash. I have never really counted but it's more than the amount of times listed in the user manual for the door reversing problem. It's intermittent, which makes it very difficult to troubleshoot. I'll count next time it happens. I just went out there and wiggled the sensor that has the green light.

  • Pandorra Jun 29, 2009

    Ok..well heres the next glitch..I am looking at the manual, this is a craftman 139 53990d. Would the problem and the fix be the same?

  • Pandorra Jun 30, 2009

    Ok, my wiggling it didnt solve it, I still had to press the remote twice for it to close.



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If the main light blinks 10 times when the door reverses it is a sensor problem. Sometimes the sensors are misaligned just enough that the light comes on but closing will be intermittent. If the main light is not blinking 10 times and you have increased the down force it might be a bad RPM sensor board. This is a small printed circuit board just in front of the motor. I might add I have never seen one intermittent but there is always a first time.

Posted on Jun 29, 2009

  • 1 more comment 
  • Don Maggard Jun 29, 2009

    Just use your hand and twist them a bit. You still haven't said if the main light is flashing 10 times. That would help me.

  • Don Maggard Jun 29, 2009

    That may take care of it. Sometimes you have to get really close to the sensor and you can then see it flickering ever so slightly. This is when they are most intermittent.

  • Don Maggard Jun 30, 2009

    Yes the fix would be the same.



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