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

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On cool mornings door is dead nothing works,remote, wall switcth. checked wires and safety sensor good. door opener will work latter in the day.

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Make sure you are getting power from the wall and that it is reaching the opener. Remove the logic board and check for cracks or bad connections on the printed circuit board especially around the small transformer.

Posted on Sep 07, 2009

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The garage Remote control was working normally at first then for now reason now it just opens the garage door but doesn't close it. I checked the side sensors they look OK & clear, and I...


It could be the garage door motor that is acting up. Try closing it with the button in the garage. If that's not the case, you may need a different garage door opener.

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Brand new sears GDO 3/4 hp DC motor with backup battery. One day all remotes work, external keypad, and homelink. Next day, ignores them all (!!??) have re-checked wiring, safety and wall switch. I get the...


The 3 flash error code is "Door control or wire shorted". Try disconnecting the wall control for a time and see if your problem quits. If you used staples on the wiring make sure they did not cut the insulation.

Jan 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Older model 1/3 hp craftsman goes up not down with remote


Your door sensors are either bad or need simply to be aligned. They must be pointed at one another to work properly. Each of them has a small light that will be lit when they are pointed correctly.

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

1 Answer

My craftsman139.53644SRT won't close w/remote


You must make sure you followed the color coding of the wiring to the sensors. One wire is solid white and the other is white with a black stripe. Make sure the small light on each sensor is lit and not flickering. If nothing works then you must have a power problem. Make sure it is plugged in.

Jul 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not close


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

Jan 21, 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

Remote only closes the garage door, will not open it


Anytime a door opens and/or closes randomly or doesn’t work consistently I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote signal.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation / interference stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

In your case the expansion of the wall in the afternoon may be enough to cause pressure on the wire to increase the problem – works in the morning but not the afternoon.

Also after you change the batteries you need to reprogram the remotes.

HOPE THIS HELPS

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

1 Answer

Sears craftsman garage door opener


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

Jul 13, 2008 | Sears Craftsman LiftMaster Chamberlain...

6 Answers

Garage door remote won't open the garage door


The little button with a padlock on the wall control is a "vacation" lockout feature that disables the remotes. There should be a small LED on the wall control that is always on steady. When the padlock button is pressed and released the LED should be constantly blinking (indicating the vacation lockout mode is active) and your remotes should be disabled. The wall control will still operate the door. Pushing the padlock button again should make the LED stop blinking and restore the door to normal operation.

Jun 18, 2008 | Sears Craftsman LiftMaster Chamberlain...

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