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

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Our garage door opens at random times throughout the day and night. Can this be adjusted somehow? Thanks for the help! Good day

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Try looking in your user manual or on the internet about how to change the frequencies used by the garage door remote and reciever. I'm guessing it is picking up signals from some appliance on the same frequency, either in your house or nearby. Also, try nearby houses' remotes on your door– it could be them interfering with you.

Posted on Jul 29, 2009

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Garage door opens randomly


Steve, If you have a remote door opener, change the code, as one of your neighbors may have their door using same code. Also make sure there is nothing hanging or blowing in front of sensor lights.
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I have a LIftmaster garage door system that is less than 1 year old. I am experiencing problems with the inside garage door light coming and staying on throughout the day and night. I noticed this...


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1 Answer

Chamberlain GDO light turns on randomly at any time of day or night. (Whisper Drive with Motion-Detecting Control Panel 935CB.)


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1 Answer

Somehow my garage door Sensors (at the bottom of door opening) had debris which caused the Sears Door to go down and then go back up. I carefully removed the debris and now the door is stuck in the down...


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1 Answer

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I have similar jerkiness problem and have gone through all the nine yards of possible causes. The motor stops at random position and at random time. Even when I unhook the door from the carriage, it still showed this symptom. It started when I had one torsion spring broken. I replaced both torsion springs and adjusted for weight balance. Make sure the two cables windup properly along the thread of the pulley; Checked the photo eye sensors; checked/test capacitor; cleaned rpm sensor; adjusted all possible force settings; make sure limit switch at sound; re-programmed my remote just to check if the logic board somehow still work on this side and it did;
One important observation I have is that when I adjusted the carriage chain, I've noticed that the opener unit turns off and on as if there's a loose connection/contact. This I pursued more. The more I investigate, I spotted a "tiny" spark on one logic board soldering at the transformer footing as I **** the back panel (where the board is mounted) back and forth to simulate the on/off due to the loose contact observed earlier. This one solves everything! All I had to do is take the logic board out and re-solder that failed connection and Hooray - it fixed the problem!
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Canton, Mi

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2 Answers

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Sounds like the Logig board is going bad in your unit.

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1 Answer

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try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

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