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

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We close our garage door when we leave and we will come back home and it is open. Sometimes the time frame is a long time, other times it is a short period of time. We want to change the codes but there is nothing in the Manual that tells us how to do this. Can you help? M. Pratt

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Anytime a door opens and/or closes by itself I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

HOPE THIS HELPS

Posted on May 29, 2010

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3 Answers

I have a craftsman garage door opener and I have to hold the button down in order to close the door. The door opens fine and the sensors are clear. The unit starts to close then stops, the lights start...


When you can close the door by holding down the wall button it IS the safety eyes or wiring.

If the eyes are mounted to the track. Many times the track wll move as the door closes causing the eyes to move out of alignment.
Watch as the door moves down and see if they need to be adjusted.

If the eyes are not both lit - they are out of alignemnt or have a wiring problem. try adjusting them and see if the lights come on. - if not check the wiring

Hope this helps

Jul 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Trying to clear the codes from my Garage Door opener. 41A3615, 139.53615SR, Grey Learn Button, '92 mfg date. I added a Klick universal wireless wall pad and a Klick universal remote and now my neighbor's...


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.


Mar 29, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opens whenever it wants to


In most cases, when a garage door opens or closes by itself, or when you find your door open, up 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 ta continuous 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 which can also go bad. It is a process of elimination.

Oct 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My remote intermittenly opens/closes the garage door


You can find a free manual for your door opener at manualsonline .com You might want to look at how to program it and change the unit to a different frequency. You can sometimes get better response and eliminate interference. Also make sure your battery contacts in the remote are clean.

Sep 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener trips the GFCI


When garage doors get sticky, bent, and the chain needs lube they will trip the controls. A door may suddenly reverse for no apparent reason, that is friction. A GFCI is real sensitive to load. Also check the wiring to the unit. Any bad connection will upset the GFCI. Check all the way back to the breaker box, sometimes the screws on the wires need to be tightened.

Apr 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Starts and stops, must push button several times


i would guess that the batterys need to be changed? is it extremly cold were you are as that can affect the doors performance

Jan 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opener operates on its own sometimes


maybe a short in wall wiring is causing motor to overheat and shut down for 15 minutes. try disconnecting wiring to wall pushbuttons and see what happens.

Dec 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

5 Answers

Opens when we're not at home


Here is the manual, so you can change your code. This should FixYa:) Let me know if you need more help!

http://lib.store.yahoo.net/lib/aaaremotes/976LM-manual.pdf

Thanks!

Nov 03, 2008 | Sears Craftsman LiftMaster Chamberlain...

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