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

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Wiring the sensors using quick connect

I am installing a craftsman garage door opener and cannot figure out how the quick connect wire ports work Is there a lever or screw to secure the wire once inserted?

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The ports are spring loaded and should hold the wire without any further ado.

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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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...

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

Craftsman # 139.53879 -1/2 h.p. Door opener- problem re-programing remote unit. Garage door will open but not close using remote. Wall switch works fine to open & close.


Check your door sensors. They must be pointed directly at one another and the small light on each one must be lit and not flickering. If by tweaking them you can't get both lights to come on you may have a wiring problem or one of the sensors has quit working.

Apr 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Have a Craftsman Garage door opener - doesn't activate, only the light blinks. Neither sensor has any lights lit. Any suggestions?


If you mean the main light blinks when you try to close the door then you have bad door sensors or the wiring going to them. Make sure the connections are tight and the wire is not broken somewhere.

Nov 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sensors


I think someone has used wiring that didn't come with the opener. One the rear of the motor unit are wiring terminals. The sensors connect to terminals 2 and 3. Whichever color wire is connected to terminal 2 goes to the screw marked white and the wire on terminal 3 goes to the screw marked black. This information is if you have a Craftsman or Chamberlain opener.

Sep 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Opener (Unit run front & back only for 2 second)


Double check to make sure the sensors are wired correctly. The 2 solid white wires go to terminal 2 and the wires with black stripes go to terminal 3. If the wiring is correct then you possibly have a bad RPM sensor. The RPM sensor is a small circuit board just in front of the motor.

Jul 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener Craftsman


Make sure they are pointed at one another and the small light on each one is lit and not blinking. Make sure the wiring hasn't been cut. If this doesn't do it there is nothing to do but replace them.

Jun 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

4 Answers

Door will only close when held down


That normally happens when the sensors aren't aligned. Both sensors have led lights on them the yellow/orange one will stay on all the time the green one will go out if it cant see the other sensor. Possibly theres a wire that's broken or the other sensor is really out of alignment. Check every inch of wiring from the sensor to the opener, remove wire nuts if present and check the connections. The wires that are used are small, solid and can break easily. Also see if there's a staple that's too tight, move the wire abit where it's stapled and look for damage.

Jun 23, 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...

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