Top 10 Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Questions & Answers

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

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garage door opens by itself

I have come home now a couple of times to find my garage door opened by itself. It was closed when I left the house. Am I on a similar frequency to my neighbors? or is something shorting?

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From Chamberlain's website:

There are a few different things that can cause this type of problem.

  1. Look at the LED light next to the SMART/LEARN button on the motor unit. If you are facing the garage door, the SMART/LEARN button is located on the rear end or right hand side panel of the motor unit. You may need to remove a light lens cover in order to see it. This button is either purple, red/orange, green, yellow, grey, or white in color. 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.
  2. If one of your neighbor's remote controls is inadvertently programmed into your receiver, your door will open when their remote is activated. If this happens you will need to clear out your receiver and reprogram your remote controls:
    1. Press and hold the LEARN button for six seconds, or until you see the small LED light near the button turn itself off.
    2. 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 one and two (or red and white) 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.

Posted on Mar 12, 2008

Question

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sears craftsman 1/2 hp garage door troubleshooting

Our garage door is not opening with the wall unit or remotes. When I push the wall unit I hear a click from the ceiling unit. The door operates fine manually. The green light on the ceiling unit (the SRT button I believe) keeps blinking periodically. The wall unit has a green light that is lit (not blinking). I've tried holding the SRT button since it appears it needs reset somehow but that hasn't worked. Any suggestions?

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My garage door opener will start to close then stop and go back to the open position. If I put pressure on the door as it is closing sometimes it will close all the way and sometimes it will return to the open position. Can you help me. Thanks [email protected]

Posted on May 13, 2010

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garage door keypad code. How do I reset it?

garage door keypad code... how do I reset it? I have a craftsman

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garage door keypad code... how do I reset it? I have a craftsman

Posted on Aug 10, 2008

Question

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Lightning may have hit garage

Lightning may have hit garage opener. Not working anything I can check

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Answer

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Lightning loves logic boards. You can remove the board and check for missing traces on the printed circuit. Unfortunately this is fairly common.

Posted on Jun 23, 2011

Question

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Wiring diagram for garage door opener

The sensor for the garage door opener was accidently knocked off. How do I fix it - there are 3 wires and only 2 places to wire it too.
Thanks for your assistance

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Can you hook up sensors to an older craftsman garage door that never had them?

Posted on Sep 02, 2010

Question

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Garage Door Remote Not Working Consistently

We are having an issue with a Sears Craftsmen Garage door opener where the remote will only work either very close to the house or intermittantly at a distance. We have changed batteries, re-"learned" the remotes by resetting the codes and by trying a different remote. One of the safety sensors is showing a yellow light but it is in line with the other remote. The garage door opener is working fine from the manual button.

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Lift Master Security Plus remote works only intermitenly, It seems to lock after a few tries, Works from inside garage, Seems to lock up after few tries, Wall opener fine. Changed batteries several times. Can't understand why it works and then doesn't. Tried cleaning sensors and wires,

Posted on Oct 29, 2008

Question

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excessive opening force detected (code 42)

garage opener opens a little and then it closes very slowly. The bar that holds the machine bends as it tries to open. An error comes up on the keypad, saying excessive opening force detected. I need to open it at least manuelly for now to get my car out

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un hook the door from the rail manualy open door to see if it hangs up. if it does fix the door rollers or rail. if not find out what is binding. you may need to adjust the distance it stops

I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102

Posted on Nov 21, 2013

Question

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garage door remote won't open the garage door

Worked fine until today! When I press the remote button in my car the green light goes on ( on the remote and on the opener in the garage ) but nothing else happens. The wired opener button on garage wall works just fine .

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The little button with a padlock on the wall control is a "vacation" lockout feature that disables the remotes. There should be a small LED on the wall control that is always on steady. When the padlock button is pressed and released the LED should be constantly blinking (indicating the vacation lockout mode is active) and your remotes should be disabled. The wall control will still operate the door. Pushing the padlock button again should make the LED stop blinking and restore the door to normal operation.

Posted on Jun 19, 2008

Question

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light does not come on when I open/close door, not the bulb

Garage door works but the light does not come on and it's not the bulb. Is there a switch that I can check.

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Good Morning:

I also substituted Floescent Bulbs for the standard bulbs. The bulbs would not light up although the relay was working. It seemed that the Florescent bulbs had a somewhat shorter neck. What I did was unplug the drive system from the outlet and then bend the metal connector in the socket so that it would come out further towards the opening of the socket. I then repluged the drive. The Floercent bulbs now have contact and are working perfectly. Simple problem with a simple solution.

Sandman

Posted on Oct 30, 2008

Question

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in colder weather the garage door stops when opening half way.

This started last winter, went away all summer and now as the cold sets in is back. The door stops opening half way up. If you start to put it down and then hit the up button again it will go past that point. As of this past week it now stops at 2 or 3 points on the way up. What could be causing this. I have greased the screw drive regularly and have inspected for burrs or screw damage and there is not any. It acts like there is a binding or dead spot on the screw motor but the seasonality is odd.

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I had the same problem when it was cold the door would only raise a few inches and I had to keep pushing the opener numerous times before it would raise all the way.
On the back of the opener where the wires are connected there are 2 adjustment screws, one for up pressure and one for down. I increased the up screw and now it rsises all the way. Hope this helps.

Posted on Dec 10, 2008

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Craftsman LiftMaster Chamberlain Garage Door Opener Wireless... LiftMaster

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garage door opens itself

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