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

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Door will not work , green LED flashing 3 ,wall buttons are not lit

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The flashing code 3 is "shorted wall control". I would remove it from the wall and then remove the 2 wires from the back and try your remotes. You can momentarily short the 2 wires together to operate the door.

Posted on Oct 07, 2009

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2 Answers

How do you clear and re-enter a new code for wall mounted remote


To change the code you need to locate the smart/learn button which is near where all those white wires go. Press and immediately release it and then walk over to your keypad and key in any 4 digit code you like and press enter.

See if this works for your car.

  1. Clear out anything previously programmed into the in-car system from the factory by holding down on the 2-outside buttons simultaneously, until the in-car LED starts flashing rapidly. This may take up to a minute (in most cases, the key should be on auxillary, and/or the car door must be shut).
  2. Decide which button you want to make to be your in-car garage door transmitter. Hold your transmitter up near the selected button, pressing both the garage door remote and the selected in-car transmitter button simultaneously. Hold down on the buttons until the in-car, LED light flashes rapidly. This sets the in-car remote transmitter to be your garage door openers make transmitter, but you are not done. You now need to make this in-car transmitter your personal transmitter.
3. Go to the Learn Button on your garage door opener. The button is usually next to the area where the floppy antenna is connected to the motor head. With Genie it is most often behind the light lens, and an indicator light flashes red when pressed. With Sears or Liftmaster (Chamberlain) it is near, or part of, the terminal screw board, and is a red, green or purple square button with a green, amber or purple indicator light. Press this learn button momentarily. The indicator light will turn on and blink if Genie or otherwise stay lit. For Genie systems, go back to the in-car transmitter button you programmed and press this button 3 or 4 times, or until the door starts moving. This should set your in-car transmitter to your garage door opener. For Liftmaster, Sears, or Linear Megacode press and hold the in-car button you programmed until the garage opener light flashes. Your in-car is now programmed to operate your door.



Feb 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Quantum 3213. the door opener opens neighbors and visa versa


You can follow these instructions to change the code of yours. Might work for you.

NOTE: You must change the transmitter's code before programming the transmitter to the motor head unit.
The following steps describe the process to change a Quantum™ and Classicdrive™ security code.
This process only works fro transmitters with a GREEN LED and a "U" in their model number, such as "02-3047 2B U" or "02-3047 2B UH".
Changing the Transmitter Code
1. Press and hold the button on the transmitter that you want to change. The GREEN LED will flash once and then turn off.
2. Continue to hold the button until the GREEN LED begins to flash (approx. 10 seconds).
3. When the GREEN LED flashes, immediately release the button and then immediately press and hold the same button again. The GREEN LED will now come on steady.
4. Continue to hold the button until the GREEN LED begins to flash (approx. 5 seconds).
5. When the GREEN LED flashes, immediately release the button.
6. The code for this button has now been changed to a new randomly generated code. Do not push the button again until instructed in "Programming Transmitter to Power Head Unit".
7. You must now re-program this transmitter to the motor head unit. See "Programming Transmitter to Power Head Unit".
Programming Transmitter to Power Head Unit
1. Press the PROGRAM button located on the garage door motor head unit once. The PROGRAM STATUS light on the motor head unit will turn on and remain lit for one minute, indicating that it is ready to learn the Transmitter code.
2. Press the same button on transmitter as you did in "Changing Transmitter's Code" above. The PROGRAM STATUS light will turn off indicating a successful learn.
3. Press the same button on the Transmitter once more to operate the door.
4. If you are unsuccessful in programming the transmitter to the motor head unit of if the button does not operate the door or if you wish to program another button to operate a different door, you must change the transmitter's code.
Battery
If the LED does not turn on when button is pressed, replace battery.



Jan 18, 2010 | Universal Garage Wireless Keyless Entry...

1 Answer

Wall mount button LED is flashing, remotes won't work, door won't close unless the wall mount button is held down until the door is fully closed


Sounds like you have a couple problems. First of all press and hold the button on the wall control that has a lock icon for 3 seconds and release. This should take care of the flashing LED and the remotes will now work. Having to hold the button on the wall control until the door is closed is usually a problem with the door sensors. Make sure they are pointed at one another and the small light on each is lit and not flickering.

Nov 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Lift Master 1/2 HP Prof. line and remote will not open door but from inside on wall it will if you hold the button for about 5 seconds and then hit the button again it will open door. There is a...


If you have the 3 button wall control you need to press and hold the button with the lock icon for 3 seconds.

You may also need to new wall control. You shouldn't have to hold that button in nor press a second time.

Nov 04, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster 1/2 hp won't open


Turn the gears again by hand like you did and lower the door a couple feet. Now find the 'up limit' on the side of the motor unit and using a small screwdriver turn this about 3 turns in the opposite direction of the arrow printed on the cover. Now you can go ahead and operate the door.

May 12, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

The wall button has a green light that is blinking and the car remote will not operate the garage door but the wall button works


this just happened to us today as well. the wall pad has three buttons: one large back-lit button pad to open it and a lock button and a light button. the open button was blinking quickly and would open the door, but the car remotes did not work. I found that by pushing both the "lock" and "light" button at the same time for about 3 or 4 seconds, the back-lit "open" pad stopped blinking and went to steady green. I went back to the cars and checked the remotes there. both opened the door.

hope this helps someone out there

Mar 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage door only opens with wall unit


a component in the wall unit is failing , that makes the conection happen when the remote signal is recieved , ( it is recieving the remote signal but not sending it out to the control circuit for the motor )

Dec 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door only opens with wall unitq


The unit is in the lock mode, push and hold the lock button in for about two seconds and the green LED should stop flashing. Your remotes should work.

Dec 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Green light is flashing on my garage door opener on the inside of my house/craftsman opener


Hi. The green light was flashing and ny transmitter in the car would no longer operate the door. On the back of the liftmaster, just below wker the small wires go in, there is a small, flat, green button. I pressed that with a stick and it solved the problem.

Jun 27, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The remote opener reset button goes off and will not work


The green button is not a reset it is the program button.

If you hold the button down for about 20 seconds it will erase all codes. Then, press and release the button - press and hold the button on your remote for about 10 seconds. the next time you press it it should activate the door. Repeat the 2nd step for all additional remotes.

The lock button on the wall control locks out all radio signals for vacations etc.

If the lock has been activated the green led in the wall control will flash - when the lock is deactivated the led stays solid green.

Hope this helps

May 07, 2008 | Sears Craftsman LiftMaster Chamberlain...

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