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

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Sears Craftsman Garage Door opener

Door won't open more than 6''. Motor starts the lift but reverses it back down. Manual won't budge it either. Can't see anything blocking it and chain seems OK.

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You probably have a broken spring on the door

Posted on Jan 18, 2009

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My nephew kept opening and closing my garage door, now the door won't open with the opener and I can lift it by hand. I tried pulling the cord to move it back to electric but it won't work... any...


The motor has a thermal protector that will cause the motor to quit when it gets hot. If you let it cool off it will automatically reset and should work again.

Jun 16, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Sears Garage Door opener lifts part way and stops. Connected to rail or not. Sensor circuits are working. I read that the RPM sensor would cause this if it's going down but this one is stopping while...


On the rear of the motor unit you will find the 'up force' adjustment. Increase this about 1/4 turn and try. It is also a good time to remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor and it will be obvious if it is going bad. A bad RPM sensor will cause the door to stop when the door is opening and reverse to the open position when closing.

Mar 22, 2011 | Sears Craftsman LiftMaster Chamberlain...

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Garage Door Goes down 5 inches and then up 5 inches.


Okay here we go.

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these is the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then give it a try.

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

1 Answer

Sears/Craftsman Garage Door won't budge


with the door down, disconnect with the emergency release, see if the motor operates
with no load...if the the track moves you probably have something obstructing the door
ie; a broken spring, door locks, etc ... the chain should be adjusted for just a little
**** mid way down the rail (1/4") if it still doesn't move ... call sears.

Mar 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

4 Answers

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i have a garage door opener craftman 1/2 hp model 13953985 the light is flashing 10 times . now you have too hold down on the button to raise and lower .

Feb 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

LiftMaster Gargage door opener problem


The door obstacle detector(reversing switch) needs adjustment, or the down limit sensor needs adjusting, or one of the lift springs is loose or broken. First, remove power from the opener, pull the red door release rope, and try to lift the door up manually. You should be able to lift it all the way open with litle effort. If it opens ok, pull the door down about halfway and let go. If it is properly balanced, it should stay where you left it. If the door fails either one of these tests, it needs spring replacement or adjustment. If the door moves ok, refer to your owners manual on how to adjust the reversing switch, linit switches, and photocell sensors at the door bottom.

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

1 Answer

Won't Close


Remove power from the opener. Then, pull the red release rope and manually lift open the door. It should move with little effort. Next, pull the door halfway down and let go. The door should stay where you left it. If it fails either test, the door lift springs need replacement or adjustment. If it works ok, follow the proceedure in the owners manual for adjusting the up and down limit sensors, and the emergency reverse adjustment.

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

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