Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
There is power to my garage door and opens freely with no problems. The problem has started recently that the light flashes and the door won't close. At first I thought it was due to the freezing weather. Then I noticed one of the sensor lights was not on. I replaced the sensor with a brand new one...still no light. Then I thought it might be the wire connecting the sensor to the main board so I replaced it with brand new wire. Still no luck. When I press the green button on the panel, the light turns on. (when I don't press it, it flashes every now and then). Any idea what the problem could be? Do I need to replace the back panel/logic board or the whole system?
MAKE SURE THEY BOTH SEE EACH OTHER, THE EYES HAVE TO BE LINED UP TO SEE EACH OTHER. SO TAKE A STRING AND GO FROM ONE EYE TO THE OTHER AND TRY TO LINE THEM UP THAT WAY THE EYE SHOLD GO ON TO GREEN OR RED. GOOD LUCK
Posted on Jan 25, 2009
I have had a similar problem related to my doors when they get cold-soaked. The tracks actually warp a little throwing the sensors off and causing the door to bind. The door will go down a bit then come back up. I overcame this be resetting the force that the motor puts out to lower the door and it works fine now. If you can wait for things to warm up, use the manual release lever and lower the door by hand and then reset the lever so the door can't be opened manually.
Posted on Jan 24, 2009
Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.
Posted on Jul 25, 2008
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Posted on Jan 02, 2017
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Aug 24, 2013 | liftmaster Garage Door 1/2 Hp
Sep 27, 2011 | Sears Craftsman LiftMaster Chamberlain...
If when closing the door it reverses to the open position and the main light flashes 10 times it is a door sensor problem. Make sure the small light on each sensor is on and not flickering ever so slightly. (check closely) Tweak them a little even though they may seem to be okay. Check for 5vdc between terminals 2 and 3 on the rear of the motor unit. If there is no voltage or if it is greater than 6vdc the logic board is bad.
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