Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
My own garage door opener won't open the garage door but my neighbour remote does when lock out mode is on. The opener is a Sears Craftsman Model #13953910. Neighbour has a genie. I already tried erasing the existing code by pressing the learn button but it does not go out by itself after the 6 seconds or longer. After trying the reset, the universal remote can still opened the door despite it not going through the learning mode. The problem is the same for the two garage door opener in my house so I don't think it's the logic boards. Thanks in advance for the suggestions.
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Posted on Jan 02, 2017
SOURCE: Sears garage door opener
I just found the solution for my 'ancient' Sears garage door opener, model # 139.655000, and I figured I'd share it.
There's a separate radio module, wired to the main opener. This module is small, has a short wire/antenna, and plugs directly into an outlet.
There's a manual open/close button on this module (I didn't realize this until I got up on a ladder). This button is also a removable cover; underneath it is a "smart actuate" button -- this is your learn button.
What I did was: unplug the radio module. Pry off the cover. Plug the radio module back in. Hold down the button on the remote. Press the "smart actuate" button. This programmed my remote successfully!
Posted on Sep 21, 2009
In most cases, when a garage
door opens or closes by itself, or when you find your door open, upon
returning home, the problem is due to a short somewhere. This short
is most likely to be in one of two places: either in one of your
transmitters or in the wall button or its wiring.
When there is a short in your garage door transmitter, you will often find the garage door is up upon returning home, even though you know you closed the door when you left the house. A short in your transmitter causes a continues signal to be sent. As you are pulling out of the driveway the garage door closes fully and appears to stop, but as the carriage and arm run past the down limit and hits the header bracket it reverses, and the door begins to open, just as you start driving off down the road. You come home to find the garage door is up, as if someone else had opened your door. The best thing to do to troubleshoot the garage door problem is remove the batteries from your transmitters and try operating the door from the wall button. If the problem is intermittent, you may want to do this for a day or two to eliminate the transmitters as the culprit.
If the problem persists, try removing the wall button wire at the motor head to ensure it is not a short in the wire to the button, then try operating the garage door with the transmitters only. If it stops the problem, replace the wires and test the wall button. It is a process of elimination.
Posted on Mar 29, 2010
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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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