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

2 Answers

Door won't close without holding the buttom down.

Checked all sensors and wiring. Green lights are both lit, bell wires appear fine. Light blinks like there was an obstruction, but I can't find one. I have also sprayed WD-40 on rollers and track. Manually closing the door reveals no apparent drag. Door closes fine if you hold the button until it is completely closed. I just spent $400 about 6 months ago to replace the spring. Many thanks to anyone who can help!!

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  • eeburroughs Jul 23, 2009

    Sensor lights are constant and alignment has been checked. Any additional ideas?? Thanks for your time.

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Bypass the sensors one at a time until the obstruction light goes out.

Posted on Jul 23, 2009

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Occasionally you come across sensors that are misaligned just slightly and if you look really close you will find the receiving sensor flickering. This is really hard to see and you must get right in front of it. Most times this causes an intermittent situation. Just for information you cannot bypass sensors.

Posted on Jul 23, 2009

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2 Answers

Garage door opener


The green eye receives the the signal from the Amber side. When is not on the sensors won't work. As far as the cold chamberlain did have a few issues with sensors not working or intermediate issues in cold weather. Their solution was to replace the sensors. But before you do that check everywhere the wires are stapled. Make sure that they are not pinching the wires.

Jan 01, 2015 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Garage door light blinks but doesn't stay on


Three blinking lights & door won't close by Candi
(Winston-Salem, NC)
Garage door will not open and close with remotes. Three blinking lights occur when we try to close door. What does this mean? It is a Linear unit.

I will assume you mean that your garage door will open with your remote but will not close. It should close if you press and hold the wall control button until the door is fully closed.

If that is the case, the 3 blinking lights indicate that your garage door's infrared safety beams are not properly aligned.

1) Check that the operator has power. The green lights on the sender and receiver should be lit.

2) If the receiver's green light is on, but the red light is off, the receiver has power but is not detecting the infrared beam from the sender. The red light might flash when the beam is partially detected. This can be caused by
mis-alignment or something blocking the beam.

Adjust the safety beam sender and receiver while watching the receiver's red light (stay out of the beam while aligning it). When the red light stays on, the beam is aligned and your garage door should operate normally.

http://www.linearcorp.com/pdf/manuals/LCO75.pdf

NOTE: If the receiver's red light remains off, check for:

1) Dirt on the receiver's lens,

2) Sunlight shining into the receiver's lens,

3) A short in the safety beam wiring (from staples or at the operator terminals).
http://www.linearcorp.com/pdf/manuals/LCO75.pdf

Dec 02, 2013 | liftmaster Garage Door 1/2 Hp

1 Answer

Door will not operate unless you hold down button


I am presuming the following: is it that the door will not operate unless you hold down the button to "close the door"? And the button you are pressing is the hardwired wall button or control inside the garage correct? And if you try to close the garage door with the remote the overhead lights flash off and on or the motor make a clicking sound (about 5 clicks?)
The problem is either an obstruction of the safety sensors at the bottom of the door or, one or both sensor eyes are out of alignment. If you look closely at both safety sensor eyes on the part that faces into the garage, you should see a glowing LED. One side will be an Amber color and the other Green. If one is lit (amber) but the other is not (green), that is an indication that the beam is not being received by the receiving eye (amber).
If there is no obvious obstruction (check for spider webs, dust, try cleaning the clear lenses facing each other, etc,) Try re-aligning the sensors. When they are properly aligned the Green LED will be lit. Now, check the motor for operation.
If you have difficulty getting the transmitter eye (green LED) to light, try closing the door at the wall button, then, pull the red emergency release handle to disengage the door.
Now, try operating the motor unit with the door disconnected while using the hand held transmitter. If the motor unit operates to the close position while the door is closed but not when opened, then that sounds like there is sufficient light entering the garage to "Wash" the transmitter beam out so the receiving eye does not get it.
Contact Chamberlain/Liftmaster for Sensor eye blinder shields that can be easily installed by you. (they just snap on) If neither LED is lit, make sure that the wire to the sensor(s) has not been cut off at the sensor itself. If that checks out, check the connection at the logic board. Make sure that both wires are securely connected.
If after checking all of that, and you do not have either of the LEDs on, then disconnect the safety sensor wires from the motor unit's logic board. Then take a 2" piece of bell wire and jump it across the two terminals for the safety sensors. If the unit operates normally when using the hand held transmitter, then the problem is likely: a) Bad safety sensors b) Broken wire to one or both sensors
To check if the safety sensors are good:
Remove both sensors from their mounting brackets. measure about 8" to 12" of wire from the back of the sensors and cut. You should have about 8 - 12 inches of wire on each. Now, separate and strip the insulation from each and then match the white striped wires and twist them together, and do the same with the solid non-striped wires. Take the sensors up to the motor head and connect the spliced wires to their respective positions on the logic board. Now, Point the two sensors directly at each other (its okay if the clear lens part are touching each other) Check if both LEDS are now lit. 1) If YES; then the sensors are good, the wire to them is broken somewhere; [FIX] replace the wires for both sides. 2) If NO: then the safety sensors need to be replaced. [FIX] Replace the sensors, contact Chamberlain / Liftmaster for replacement parts. You will need your garage door opener's model # which can be found under the light bulb or light fixture on the opposite side of the logic board. Having the model # speeds up the parts search for you.
I hope this helps you out. [I have been factory trained on residential and commercial garage door openers by Chamberlain / Liftmaster and have been providing installation and tech support on them for over five years. Prior to that I used to install and repair these units, and I've done that for nearly seven years.]

May 18, 2011 | Chamberlain & Liftmaster Garage Doors

1 Answer

The door will open just fine, when closeing the door (by the wall switch) it will not close unless you hold the buttom down. The sensors at the bottom of the door has a green light on one side nad the...


Your door switch is bad. You can get one at home depot, it's nothing more than a door bell button. Your lights are correct and I bet if you try to close with your remote it works. That also will verify it's a bad button.

Mar 01, 2011 | liftmaster Chamberlain Garage Door Opener...

2 Answers

Sensor problem with garage door opener. One of them has a yellow light the other a green. The door starts to close than stops. You can close it if you hold the button down inside and the remothe doesn't...


If it moves 6-8 inches and then stops it is most likely the rpm sensor.

Yellow and green are what the lights should be.

Does the led on the wall control blink?? If is does press the lock button.
If it doesn't you will need to reprogram the remote.

Watch the eyes as the door closes, does one of them go off? If so the track may be flexing causing misalignment. (Widen the track near the bottom)

If all of the above don't help check the sensitivity adjustment. Turn it about 1/8 turn clockwise and try the door again - continue this until the door goes full cycle without reversing. If you have to set the sensitivity past 3/4 the door needs to be adjusted.

Jul 20, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door won't close without hold down the remote. Lights blink fast and I have cleaned the sensors adjusted sensors. What else can I do?


IF THE DOOR CLOSES FULLY WHEN YOU HOLD DOWN THE WALL BUTTON AND NOT IF YOU PRESS AND RELEASE THIS DEFINATLY MEANS THE EYES ARE THE PROBLEM.

BE SURE THE SENSORS ARE MOUNTED 5" ABOVE THE FLOOR ON EITHER SIDE OF THE DOOR. ANYPLACE ELSE IS UNACCEPTABLE.

THE LIGHTS ON THE SENSORS SHOULD BOTH BE LIT AND SOLID.

WATCH THE SENSOR LIGHTS ON THE WAY DOWN IF THEY FLICKER OR GO OFF YOU HAVE AN ALIGNMENT PROBLEM.

BE SURE TO CHECK POLARITY AND CONNECTIONS ON BOTH SENSORS.

YOU CAN TAKE WIRE AND RUN IT DIRRECT TO EACH SENSOR IF YOU THINK TH PROBLEM MAY BE A BAD WIRE.

HOPE THIS HELPS

May 11, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Chamberlain garage door will not close


See if both sensors stay lit until the door reaches the closed position.

If either light is off or flickers the door will go back up. Try aiming the eyes very carefully. If they are aimed properly. Check the wiring if you move the wires and the light flickers you have a bad connection. If the lights don't come on you may have a broken wire.

Mar 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My red light sensor is blinking constantly and the green light sensor is steady. I grab hold of the red light sensor and squeeze and the light goes solid and I am able to close the garage door. when i let...


It sounds like there might be a loose wire connection on the inside of the sensor. You could also be moving the position of the sensor slightly into alignment when you squeeze the sensor. You will need to disconnect the wires for the sensor on the garage door opener or disconnect the power. Then use a flatblade screw driver and carefully seperate the sensor case. Check for any loose connections on the wiring(you might need to re-solder the wire to the sensor eye). It sounds like a loose wire connection to me.

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

1 Answer

Door won't close, with out hold down on button.


If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not blinking.

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

1 Answer

Liftmaster "Pro Line" Garage Door Won't Close-1999-#41A5021-C


If the main lights flash 10 times when the door reverses it is a problem with the door sensors or the wiring to them. Each sensor has a small light that must be lit and not blinking for them to work properly. Make sure each of them is on. If the sensors have been bumped you can tweak them a bit to get them pointed correctly. If you can't get both sensors to light then you either have bad sensors or once again the wiring is bad. I really wonder about the wiring because of the mouse problem. Also the wires are color coded. One of the is solid white and the other is white with black stripe. They can't be crossed.

Aug 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

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