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

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Hello , I have a sears 139.18050 3/4 hp garage door opener , about 8 years old , that has just started to give us trouble; it wont close without holding the button down , reverses and flashes the lights , as if the door safety sensors were blocked , and the diag light flashes 4 times. lights on sending and receiving eye are lit . Any suggestions ?

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Pull all power and reset codes

Posted on Mar 20, 2011

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I have a sears craftsman garage door opener 139.18805 1/2 HP or 139.18850 the machine is about 6 years old and it has just started to act up. It will open only part way about 4 ft then I can close it then...


Take a close look at your door springs. Could be a broken one. If not, remove the cover and look at the drive gear. It is a white nylon gear just in front of the motor. May be going bad. It will be obvious if it is. Release the door from the opener and try opening it by hand. If it is heavy you have a spring problem.

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

1 Answer

Garage door only raises about two inches then stops.


Check the door springs and also remove the cover from the motor unit and check the drive gear. The door spring could be broken or the drive gear may be stripped.

The sensors only work when the door is closing.

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

1 Answer

Have a Sears Opener 76LE that has operated without trouble for over 25 years. Yesterday, I tried to open door and as soon as unit was under load, went into the close mode, then tried to open, then closed....


If your opener is truly 25 years old there are not going to be any parts available. The model number you give is not the model number. It starts with 139. and probably has 6 numbers after the period or dash. Once you have it you can go to Sears parts and see if there are parts available.

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

3 Answers

Sears garage door opener 1/2 hp about 6 years old. Will not respond to remotes to open and close. Light flashes on opener when remote is pressed but no door action.


Door sensors are not working. Check if lights are on both sides.
Might be misaligned or one is bad.
Door will close if you hold in the garge close button until it's all the way down.
And it will open on it's own.
You can get these off ebay.

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

1 Answer

My craftsman garage door is about 8 years old. It


Make a slight adjustment to the Upward force on the side of the machine. Turn the screw a 1/4 turn each time and test, see if that helps. Also, make sure there are no obstructions or friction when the door opens and closes. Try it manually first.

Feb 18, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door wont close all the way


NOT SURE WHAT UNIT YOU HAVE .
ALL OPENERS HAVE AN ADJUSTMENT TO TELL IT HOW FAR TO GO UP AND HOW FAR TO GO DOWN. LOOK ON THE SIDE OR UNDER A LIGHT COVER.IT HAS TO BE THERE SOMEWHERE

Nov 22, 2008 | Sears Craftsman LiftMaster Chamberlain...

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