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

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Garage door opener (chain) motor runs in reverse. Trolley slides forward trying to close door, even though it is closed, instead of sliding toward motor to open door. Happened out of the blue - was

Garage door opener motor runs in reverse

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  • Don Maggard May 11, 2010

    Need more information. What happened prior to this problem? Did you do any repairs?

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Loosen the chain enough that you can remove it from the sprocket. Run the opener until the sprocket turns counterclockwise and stops. With the door in the open position replace the chain. You will probably need to adjust your open and close limits per your owners manual.

Posted on May 29, 2009

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Start over by removing the belt.

Release the door from the trolley.

Then slide the door/trolly latch mechanism toward the motor assy half way,

Reinstall the belt but not the door to the trolley.

Ativate the remote and where the door stops, assuming it is closing , is the lower/closed limit.

Remove the belt, again.

Then side the door latch mechanism near the end of the trolley.

Reinstall the belt and activate the remote.

It should be close enough to fine tune using the limit switches.

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Check to see if the trolley is jammed against the bolt just in front of the motor unit. If so loosen the chain enough to remove the tension of the trolley. Now run the motor until the door closes. While the door is closed, locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.


Jan 21, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears garage door will not reverse. It will not close the door. Only goes 1 way has been working for years no adjustments have been done problem occurred all of a sudden


Check to see if the trolley is jamming against the bolt just in front of the motor unit. If so, loosen the chain enough that you can run the opener until it closes. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Jan 02, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door opens all the way, won't close, gets the signal but won't reverse directions...


If your door is opening so far the trolley jams against the bolt in front of the motor unit you will need to loosen the chain until the tension is relieved from the chain. Run the opener until the door closes and while the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Dec 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

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I have Chamberlain 1160 Lift-Master farage opener. Currently the trolley stuck in the upped position agains the bolt and does not go back. When I try to close the door, the motor is humming twice, then...


Loosen the chain to remove the strain from it and run the motor until the door closes. 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. Now you can tighten the chain.

Oct 25, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a craftsman garage door opener model 139.53674SRT2. It was working fine and we opened it and closed it twice today with no problem. The third time we opened it, it would not close. Both led...


The led blinking 5 times is the code for "RPM sensor or motor overload." The motor has an thermal switch which opens when the motor get hot from running too much. This automatically resets itself after about 15 minutes. This problem can also be caused when the door opens too far and the trolley jams against the bolt just in front of the motor unit. To correct this you need to loosen the chain enough to eliminate the tension against the trolley and then run the motor until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Jul 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

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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

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

How is the chain supposed to be aligned


sync the motor. the gear kit tells you how. get motor up and position trolley near motor, assuming you left chain/cable attached to trolley). Get motor up by running motor and then pushing button again. if motor reverse, let it run and it will stop in up position.

Jan 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opener will not reverse


FIRST YOU NEED TO RESET THE CHAIN .

Unplug power
Release the door from the opener close the door manually. take the chain loose and slide the traveler down to reengage with the trolley. Plug in power, run the unit with chain off untill it completes a clockwise cycle and stops. reconnect the chain and set tension.

Adjust the chain tension.

If it still moves 6-8 inches and flashes 5 times. the problem is in the rpm sensor.

Full diagnostics are in the owners manual - FREE at
http://help.chamberlain.com/help/en-us/InstructionManuals

Oct 06, 2008 | Sears Craftsman LiftMaster Chamberlain...

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