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

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We are trying to install a garage door opener and our home is pre-wired with cat5e cable and not sure what colors to hook up

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I like to use the blue wire and the blue/white wire for one side - blue/white connected to wire with black trace>

Do the same with red and red/white on the other side.

Use green for the wall control.

Hope this helps

Posted on Oct 05, 2010

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Just put in new craftsman 3/4 garage door opener it goes about 5in and comes back whats the matter..?? we cked setting

Did you install the door sensors? If you did, make sure the light on each one is lit and not flickering. Double check your wiring. Make sure you connected the wires from the door sensors correctly. They are color coded.

Sep 12, 2011 | Sears Craftsman LiftMaster Chamberlain...

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I hooked up my sensors to my chamberlain garage door and one light works and the fashing light worked than just quit tried to align but still nothing when i turn power on it clicks on and off same as i...

The small light on each sensor must be lit for them to work. Make sure you wired them correctly. Make sure the wires with the black stripe are hooked to terminal #3.

Aug 13, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Motor runs but door won't open. checked chain, seems to be ok


The problem is not the chain, it is the plastic gear in the unit of the liftmaster Garage Door 1/2 Hp.The plastic gear is not engaging, although it sounds like it is working.

You will have to replace it with a new one, then the liftmaster Garage Door 1/2 Hp will be able to open up once again.

Once you open and remove the old gear, Be sure to thread the screws in all the parts before you install them. Pre-threading them once would really help. Secondly, label the wires on the back of the opener before lowering it to the ladder, so you can put them back in their proper place.

Hope this was helpful.

Jun 27, 2011 | liftmaster Garage Door 1/2 Hp

1 Answer

I have pre wiring in my garage for the opener which has white,red,blue,green wires. The opener came with red,white for the control and black white for the sensors. How do I connect four wires from prewirng...

The opener actually needs 6 wires. They gave you 4. It depends on where the wires end as to what you can do. A good imagination will help. I personally would install it with the wires furnished with the opener.

Oct 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Remote control unit does not open the door. we

You can try reprogramming the remotes to the opener that is not working. Sometimes they get a brain freeze and drop the codes and reprogramming can fix it. Next to where the wire hangs down will be a colored square button (the learn button) press once and release, you have 30 seconds to try and program a remote, you don't need to do all in the 30 seconds. Press and hold the button on your remote that you want to use until you see the light on the opener blink or hear a click sound from opener, let go of the button. it should now be programmed. If you can't get any of them to work then the logic board is bad.This repair can cost as much as a new opener + install. Sears sells a "remote control conversion kit" it comes with 1 remote and a plug in receiver you attach to your existing opener. 2 wires come off it and hooks up where your wall control hooks up at the openr.It's pretty easy to install. FYI the remote controls are color coordinated meaning the buttons on the remotes have to be the same color or they won't work, so if existing remotes are not the same color as the one in the kit they will most likely have to be replaced. good luck!

Jul 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Dog chewed sensor wire so garage door won't, i

Basically any bell wire will work, available at any home centers everywhere. if the existing wire is long enough, just wire nut it together (white to white, color to color)

Feb 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have the 1754 mt model garage door opener and the people who installed it did not hook power up. it says to hook black wire to L2 and white to L1 and green to ground. i did that and plugged cord in and...

Do you have the manual? You have to program the wireless remote. Not sure of the exact procedure on this model, but the manual will explain it. If no manual let me know, Countrycurt0

Jul 21, 2008 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Wiring diagram for garage door opener

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

Jun 21, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Wiring on a chamberlain 7200 opener

You'll need to go to :

Go to the middle of the page 'Search Product Manuals'.
Type in your model #, xxx-xxxxxx of the garage door open.
It should give you the correct wiring diagram your looking for.

Feb 14, 2008 | Sears Craftsman LiftMaster Chamberlain...

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