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

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Craftsman opener, 16 years old, want move, all lights are working

Power is getting to the unit. sensors are aligned and working, remote or wall switch will not operate.

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Remove and check the logic board for missing or burnt traces. Check closely around the small transformer. Be sure to unplug the unit before you do this.

Posted on Aug 01, 2009

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1 Answer

My Chamberlain Liftmaster Formula 1 garage door (2002) has stopped working. The power is on -- light turns on when I push the wall mount button. But the remotes no longer work. The door does not move. ...


The light by the learn button may be sending a diagnostic code. See if it is flashing a number of times, pausing and then repeating. Count the flashes. Is your door stuck in the open posititon?

Jun 11, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have the same problem that is listed above with my 1/2 horse power belt drive garage door opener. The lights on the sensors are both green and the alignment works, the overhead light will turn on if the...


Sounds like you have a couple problems. The opener is in the lock mode which is the reason the remotes will not work. Press and hold for 3 seconds the button on the wall control that has the icon of a padlock on it. This will unlock the opener and your remotes will work. If when you try to close the door the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. One of the small lights on the sensor may be flickering ever so slightly. Tweak them a bit and try. If this isn't the case and the main light is not flashing you can try increasing the down force just a tad. This control is on the rear of the motor unit near where all those white wires go. Increase this just a bit and try. If this doesn't work you most likely have a bad RPM sensor board which is a small printed circuit board just in front of the motor. It will cause this problem.

Dec 15, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My mom & I each have a Craftsman garage door opener at our respective homes & live @ 15 minutes apart. Our openers are about 13 to 14 yrs old. The past two yrs. we've both had the same problem. ...


If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure both lights on the sensors stay on and don't flicker while the door is moving and the sensors are firmly attached so they don't move. Tweak them just a bit.

Nov 09, 2010 | Sears Craftsman LiftMaster Chamberlain...

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

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

Garage remote wont work


Silly question, But have y7ou checked the battery polarity in the remotes? If correct. does the Led come on when you press the buttons? If not, check the battery contacts.

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1 Answer

Garage door opener will not work


Make sure there is a light on both safety eyes. If there is only one light on. It is most likely an alignment issue. Make sure the two sensors are pointing directly at each other. If no lights are on they are not getting power.

Jan 25, 2009 | Sears Craftsman LiftMaster Chamberlain...

14 Answers

Sears craftsman 1/2 hp garage door troubleshooting


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 pbstation771@verizon.net

Aug 18, 2008 | Sears Craftsman LiftMaster Chamberlain...

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