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

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When the button is hit the garage door opener makes a humming sound but the motor is not running.

Craftsman 1/2 opener

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: Craftsman Garage Door Opener Won't Open

When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.

Posted on Dec 07, 2008

  • 118 Answers

SOURCE: motor runs but door does not open

you have a stripped gear on your opener. Replace gear and sprocket kit

Posted on Feb 08, 2009

  • 118 Answers

SOURCE: Craftsman garage door opener - Clicking/blinking - no open/close

First, check the safety eyes. There should be a light on each eye that is on. If not, realign the eyes. If that does not work, check the force settings. They are the blue adjustment screws. They should be set on 4-5. Do not go above 6 or there is a problem with either the door or opener, or both. If this does not work check all of the wiring on the back of the opener. 1 should be a red wire, 2 should be three white wires and 3 should be two black wires. Check the wiring to the wall button. the back of the button indicates red and white screws. To take off the wall button you will have to remove the big white button if you have the "deluxe wall control" If this does not fix it, respond with more info on door position and what happens with remotes and wall button.

Posted on Feb 26, 2009

  • 3197 Answers

SOURCE: I have a Craftsman 1/2 HP model #13953975SRT1.

It is normal for it to blink randomly. If you watch it while you press your remote you will see what it looks like when it is receiving a properly coded signal.

Posted on Jun 01, 2009

  • 3197 Answers

SOURCE: motor hums but door will not open

Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. The part number is 41A2817 and is available from Sears or any good door opener service company. It comes with instructions.

Posted on Jun 07, 2009

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1 Answer

My 1/3 hp craftsmen door opener just hums when you hit the wall button or remotes in the car. I replaced the starter motor capacitor and nothing changed any ideas?


Is the door stuck in the open position? If so the trolley is probably jammed against the bolt just in front of the motor unit. Loosen the chain until the tension is removed from the trolley. Run the motor until the door is closed. While the door is closed locate the 'up limit' adjustment on the side of the motor unit and turn this 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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

1 Answer

My 1/2 hp sears craftsman garage door opener bought in 1992 has stopped working, The motor hums when the remote or wall button is pressed but the door will not move at all. Please help


Most common cause of the problem you describe is a bad start capacitor. Remove the cover from the motor unit. The capacitor is about 5 inches long and 2 inches in diameter.

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

1 Answer

LiftMaster garage door opener won't open. When push button (from either remote or "door-bell" style button on wall), unit makes a slight humming sound for a couple of seconds, then nothing...?


Check the door springs and also the drive gear. The gear is a white nylon gear just in front of the motor unit. It will be pretty obvious if it is going bad. The door spring may be broken.

Oct 23, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Craftsman garage door opener model 139.53325SRT 1/3 HP, it was working fine and then it would not open, when push the wall switch, the opener hums and the light starts flashing, I have removed the...


It sounds like your door sensors may be misaligned. If when you try to close the door the main light flashes 10 times and the door reverses to the open position this is the case. Make sure the small light on each sensor is lit and not flickering. Tweak the sensors to see if you can get both lights to come on. If not you have a bad sensor.

Feb 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Liftmaster GDO makes a clicking sound and won't open


See if the trolley is jammed against the bolt just in front of the motor unit. If so remove the bolt and then run the opener until the door is closed. While the door is closed locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Remember to replace the bolt.

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

1 Answer

Motor humms but door doesn't go up or down!


5 flashes is the code for "RPM sensor board or motor overload." If your door is stuck in the open position the trolley may be jammed against a bolt just in front of the motor unit. Remove the bolt and run the opener until the door is closed. Now locate the 'up limit' control on the side of the motor unit and turn it a couple turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.

Sep 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Sears Craftsman 1/2 horse garage door opener. When I push the button, I can hear it hum, but the chain won't move and it seems the sprocket is frozen?


If your door is stuck in the open position you will find the trolley is jammed against a bolt just in front of the motor unit. Remove that bolt and run the opener until the door closes. Now locate the 'up limit' control on the side of the motor unit and turn it 2 times in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door opened but will not close. I opened


I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

Sep 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman garage door opener 1/2 hp will not open door


It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

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

1 Answer

Craftsman 1/2 hp garage door not running at all


DOES IT WORK FROM THE WALL BUTTON??

IF NOT YOU MAY HAVE A BAD CAPACITOR - UNPLUG THE UNIT TAKE OFF THE COVER AND LOOK FOR A ROUND TUBE THAT HAS 4 WIRES CONNECTED ON ONE END . IF IT IS LEAKING OIL OR HAS A BROWN OR BURNED LOOK ON THE CARDBOARD END WITH THE WIRES IT IS MOST LIKELY BAD.

SHOULD BE AVAILABLE FROM ANY MOTOR REPAIR SHOP

HOPE THIS HELPS

May 08, 2008 | Sears Craftsman LiftMaster Chamberlain...

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