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

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Chamberlain 1/2hp won't open/close and learn LED flashes 5 times

My Chamerlain 1/2hp opener won't open or close, and the motor hums for a few seconds when I try to activate it. It actually sounds as if the motor tries to move in one direction then the other before it stops. Also, the LED light next to the transmitter button flashes 5 times, pauses for three seconds, then repeats the 5-flash cycle. Any ideas?

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  • hankonthego Jan 03, 2009

    I have same problem and my traveller is all the way against the bolt...


  • dbaum25 Jan 04, 2009

    We are having the same exact problem w/ the same device however our traveler is not jammed against the bolt...motor sounds but no movement at all - tried unplugging operator for 2 minutes with no solution...

  • Joseph Chapman
    Joseph Chapman May 11, 2010

    Where is the traveler? Is it all the way to the powerhead jammed against the bolt?


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  • 98 Answers

The gear needs to be changed kit #41c4220a. Be sure to change the bottom bushing on the motor mount.

Posted on Jan 04, 2009

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5 flashes of the LED is the code for "RPM sensor or motor overload." You can try unplugging the opener for about 15 minutes to see if it resets itself. Normally if it is the RPM sensor the motor will run for a few seconds and then turn off. Is the door not opening or not closing? Just checking to make sure.

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On the back of the garage door opener there is a red button. Depress this button and sync your keypad to the opener. This will re-establish the code and reset the remote.

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I have a Sears Craftman 1/2 HP Garage Door Opener and on the back of the opener device, there is a re-set button. Above that button is a yellow light that flashes 5 times. I assume this is a code that is...

That is not a reset button it is the smart/learn button and is used to program remotes. If you mess with that button you can erase the memory and none of your remotes will work.

The code you are seeing with the 5 flashes of that small LED is "RPM sensor or motor overload". Your RPM sensor could be going bad but you should try increasing the down force first. The down force is a control in the same area as the smart/learn button. Increase this a bit.

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My garage door opens fine but will not close unless I press down the button on the wall. The sensor lights are solid and I unplugged it for a minute and I'm still having the same problem.

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If the main light does not flash then you can try increasing the down force just a little. This control is on the rear of the motor unit near where all those white wires go.

Check the small LED near the smart/learn button. If it is flashing a code of 5 blinks then a pause and 5 blinks it is the RPM sensor. This is a small printed circuit board just in front of the motor.

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The unit is flashing the code for 'motor overheated or RPM sensor failure'. If the door is stuck in the open position it could be because the trolley is jammed against the bolt just in front of the motor unit. Remove the bolt and run the opener until the door is closed. Now on the side of the motor unit you will find the 'up limit' adjustment. Turn this 2 full turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.

Dec 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have the same problem.The garage door opens or closes on its self after setting up the new remote chamberlain. i foun out every time my nabour closes his garage door mine opens.

Look at the LED light next to the SMART/LEARN button on rear of the motor unit. You may need to remove a light lens cover in order to see it. If the light is flashing rapidly this means you have a stuck button on one of your remote controls. Take the batteries out of each remote control. When you remove the batteries from the bad remote, the light will stop flashing. This remote needs to be replaced.

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Chamberlain 1/2 HP door opener will not work (102 1499A))

sounds like the clutch in the motor is slipping, perhaps the chain is getting kinked on something. check to make sure there is nothing in the way of it and that it is on track going into the motor

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