Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo
Posted on May 14, 2010
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Remote cotrol activation runs only for couple

My Craftsman opener stops in couple of seconds after remote control activation and keeps repeating the same symptom.

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  • Master 3,197 Answers
  • Posted on May 14, 2010
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You need to post again with a little more detail. Does it stop on the way up? down? do the main lights flash? Does it do the same thing when you use the wall button?

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Programming remote and in car garage door openers to the Craftsman AssureLink Garage Door opener - Model - 139.3043

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My garage door keeps opening on it's own during the middle of the night or during the day. What's causing this

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.


If one of your neighbors remote controls is inadvertently programmed into your receiver, you door will open when their remote is activated. If this happens you will need to clear out your receiver and reprogram your remote controls. Press and hold the smart/learn button for 6 seconds or until you see the small LED light near the button turn itself off. If the above steps have been followed and the symptoms continue, there may be an electronic short in either the wall control button or the receiver logic board. In this case, remove the wall control wires from terminals 1 and 2 on the motor unit. Should the symptoms persist after the wires are removed, replace the receiver logic board. If the symptoms stop with the wall control wires removed from the motor unit, replace the wall control button, and the wires leading to the wall control button.


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How does everything look well? How old is unit? Did you push learn button for 10 seconds. Then pusj for 1 second and activate a remote button. lightbulb on motor should blink. if so, hit learn again for 1 second and push button on other remote. Do you have a LOCK or VACATION button. Make sure it is off . Is light on wall console blinking. you have remotes locked out.
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If the lock has been activated the green led in the wall control will flash - when the lock is deactivated the led stays solid green.

Hope this helps
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