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

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One of the trip sensors shows a yellow LED, the other sensor shows a green LED. The door will not go down unless the close button is held. A force down adjustment does not help. Even when disconnected from the door, the opener will not close. I suspect the sensor. Any thoughts?

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If when the door reverses the main light flashes 10 times it is a sensor problem. If not it could be the RPM sensor board which is a small printed circuit board just in front of the motor.

Posted on Jul 25, 2009

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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

2 Answers

Garage door opener won't close unless button is held. replaced safety sensors, tried realigning sensors, no joy. help!


Hello. follow this link and read Q&A #1, I think this may be the issue. The link to purchase new sensors (if necessary) is imbedded in that paragraph at the end. Also, here is their toll free: 1(800) 711-8410. If this helps please vote four-thumbs please.

Good luck.

Mar 25, 2011 | Building Materials

1 Answer

My fixed garage door opener opens fine, but only closes if it is held down. My remote garage door openers do not work at all. I replaced the sensors and they appear to work fine. I tried to reprogram the...


If the sensor is working right, that leaves the downward force sensor tripping. First check for track obstrucions by manually moving the door with the lift disengaged. If door works without excessive force, then increase the force sensor of the lift a bit.

Jun 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Wall mount button LED is flashing, remotes won't work, door won't close unless the wall mount button is held down until the door is fully closed


Sounds like you have a couple problems. First of all press and hold the button on the wall control that has a lock icon for 3 seconds and release. This should take care of the flashing LED and the remotes will now work. Having to hold the button on the wall control until the door is closed is usually a problem with the door sensors. Make sure they are pointed at one another and the small light on each is lit and not flickering.

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

1 Answer

Left Sensor has yellow led & right sensor is green. Garage closes and then immediately opens. I'm assuming it's the sensor with the yellow led. How do I fix this?


If the main light flashes 10 times when the door reverses it is a sensor problem. Make sure the door isn't hitting the floor and then reversing. This problem will not cause the light to flash 10 times and can be corrected by adjusting the 'down limit' which is on the side of the motor unit.

Jul 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will inconsistenly not close


It is normal for that LED by the learn button to flash randomly. It can also flash a code to help with diagnosis. The codes are 1 to 6 flashes followed by a pause and then repeats. A rapid flash is a sign it is receiving a radio signal but not necessarily the correct one to operate the door. If when your door doesn't close properly the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. The sensor must be pointed at one another and sometimes can be off just a hair and will cause intermittent problems. A slight tweaking of the sensors will cure this problem. The 'down force' adjustment can be set too low and cause the door not to close sometimes. This can be increased to overcome this problem. This problem will not cause the main light to flash. The other possibility is the RPM sensor. This is the printed circuit board that senses when the door runs into something. I have never seen one intermittent but that doesn't mean it's not possible. I hope this helps you.

Mar 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

4 Answers

Door will only close when held down


That normally happens when the sensors aren't aligned. Both sensors have led lights on them the yellow/orange one will stay on all the time the green one will go out if it cant see the other sensor. Possibly theres a wire that's broken or the other sensor is really out of alignment. Check every inch of wiring from the sensor to the opener, remove wire nuts if present and check the connections. The wires that are used are small, solid and can break easily. Also see if there's a staple that's too tight, move the wire abit where it's stapled and look for damage.

Jun 23, 2008 | Sears Craftsman LiftMaster Chamberlain...

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