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

1 Answer

Opener will not reverse

I have a chamberlain garage door opener. when I press the button to close the door the motor makes a sound then stops and but nothing happens. It looks like it is trying to open it instead of closing. I verified this by removing the chain and saw the gear turns in the direction of openning the door even though the door is already up. I also see an led light blink 5 times and stop then repeats.
Isn't it supposed to reverse direction if already at end of it's travel.

Thanks for your help in advance.

Posted by on

  • Anonymous Oct 06, 2008

    I have the exact same problem with my craftsman garage door opener

  • georgie99999 Jan 20, 2009

    I have the same problem. What is the solution. What part needs to be replace? I dont want to have a serviceman come out. I could buy a new one for less.

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  • 504 Answers

FIRST YOU NEED TO RESET THE CHAIN .

Unplug power
Release the door from the opener close the door manually. take the chain loose and slide the traveler down to reengage with the trolley. Plug in power, run the unit with chain off untill it completes a clockwise cycle and stops. reconnect the chain and set tension.

Adjust the chain tension.

If it still moves 6-8 inches and flashes 5 times. the problem is in the rpm sensor.

Full diagnostics are in the owners manual - FREE at
http://help.chamberlain.com/help/en-us/InstructionManuals

Posted on May 29, 2010

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