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

1 Answer

L.E.D lights at back constantly blinking, garage door won't open

Both remotes do not work 90% of the time, wall unit the same. Began as a gradual thing. Would work fine for a short time after switching power outlet then back to not working. Craftsman 139.53648SRT

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  • kenjico Jun 16, 2009

    It was helpful but didn't solve the problem but helped narrow it down. Finally, when I had a remote in one hand and tapped on the side of the door opener 2 or 3 times, it opened. Most likely now looking for a loose connection inside the box.

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If the LED is blinking randomly it is normal. If it is blinking rapidly you have interference from somewhere. To eliminate any interference start unplugging anything electrical and watch the LED. Some things will interfere that you wouldn't even think of like a heater in an aquarium. Check everything especially in the garage.

Posted on Jun 15, 2009

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