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

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Maybe motor when you plug in the the opener the motor acts like it is stuck turning one way...i have tried ajusting the limit switches and it is hung in that one way any ideas....

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  • ioldman46 Jan 20, 2009

    motor hums when I try to operate door opener. lights flash and motor hums like it is stuck in one direction

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How old. what model. if old, gears may be stripped. take off cover and watch limit switches. are they moving; contacts ok ; wires connected.

Posted on Jan 19, 2009

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I have a genie pro 88 garage door opener push the button and it opens just fine traviels up to the limit switch and stops perfect. then push the button to go down and nota,


are the wires connected to the motor correct
for the limit switch there should be one wire ( normally black or neutral going to the center connection and the other wire ( red or active wires going to either of the other two terminals
that set up means that power is available to the limit switches and the return is the neutral wire
it works like this
on the up direction power is delivered to the motor by the controller box through a closed limit switch
when the up limit is circuit is broken the motor stops
the down button reverses the polarity of the motor in the controller box and so the motor runs in reverse through the the lower limit switch until that circuit is broken In the down action the upper limit switch circuit is completer but the control box has no power to it until the lower switch circuit is brokenis broken
the motor is dc voltage and to getting it to go up or down is done by the control box changing polarity for the motor power according to the button position pressed on the remote

Oct 28, 2016 | Genie Pro Screw Drive Garage Door Opener...

2 Answers

Chamberlain Lift Master Pro Formula 1 only makes click sound


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 enough to free the trolley and then run the opener until the door is closed. While the door is closed locate the 'up limit' on the side of the motor unit and turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Apr 03, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The doo seems to be stuck down...like the upper


On the side of the motor unit you will find the 'down limit' adjustment. Turn this in the opposite direction of the arrow printed on the cover. It may help if you remove the cover and you can see the limit adjustment assembly. It will help you understand the problem.

Dec 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman GDO don't not respond other than a click noise when remote or wall unit is pressed. When power is removed, then restored, wall switch is pressed, unit clicks, then green LED on back of unit...


The unit is flashing the code for 'motor overheated or RPM sensor failure'. If the door is stuck in the open position it could be because the trolley is jammed against the bolt just in front of the motor unit. Remove the bolt and run the opener until the door is closed. Now on the side of the motor unit you will find the 'up limit' adjustment. Turn this 2 full turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.

Dec 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Have replaced drive gear on Craftsman GDO. Everthing engages and chain moves but door only opens 3 inches are so. Have ajusted opening cointrol on side to max and only 3 inches. When I unlatch GD from...


Loosen the chain enough that you can remove it from the pulley on top of the motor unit. Now with the door closed run the motor until the pulley turns in the clockwise direction and stops. Put the chain back on the pulley and tighten. You may have to tweak the up and down limits now.

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

3 Answers

How do I reset my garage door opener. It is a Coromaster 2000 motor. The closing and opening setting are out and the motor only stops due to resistance.


The Coromaster 2000 does not operate off limit switches. It has a quarter-revolution optical pulse counter. To re-program the open and close limits do the following: Ensure that the door is open at least a couple of feet. Press the reset button once or twice Short out pushbutton and common and hold until close limit and then release. Door should stop at your new close limit. Wait 5 seconds. Short out pushbutton and common and door will open. Hold the short until open limit and then release. Limits should now be set.

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

1 Answer

Craftman 1/2 hp chain drive , stuck in down motion


The thing to do is remove the cover and watch the limit switch assembly. You should be able to see how it is supposed to work and determine what is wrong. A small gear on the end of the shaft turns the limit switch assembly to make contact and turn off the motor in each direction. Something may be broken or out of place. There is also a possibility your logic board is bad especially if you have had electrical storms recently.

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

1 Answer

Liftmaster door won't reverse


check the relay in ur control board or replace it
check that the plastic cap in the rpm sensors doesnt stuck with any of them
check continuity in both limit switches..
check the capacitor terminals or the integrity of it

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

1 Answer

Liftmaster garage door opener problem


stop adjusting. you are doing right thing. unit will not run down w/o eyes so removing wiring did nothing. you gave clue when yu said they were folloded. buy new set of eyes.

Oct 04, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Not working


IT MAY BE AGAINST THE TRAVEL LIMITER BOLT.

IF IT IS YOU WILL NEED TO UNPLUG THE UNIT REMOVE THE COVER AND TURN THE MOTOR BY HAND TO BACK OFF THE PRESSURE.

MAKE SURE YOU GO PAST THE LIMIT SWITCH.
ADJUST THE LIMIT SO TH DOOR DOES NOT HIT THE BOLT.

HOPE THIS HELPS

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

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