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

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Undoing sensor. Can we undo sensors from the equipment, if yes how?

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No it will not work without safety eyes. It is not legal, but some people will mount on ceiling or tape them together.

Posted on Jun 16, 2010

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The equipment it doesn work with out the sensors in some models

Posted on Mar 10, 2009

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Have trouble programming. When I reset control the doors opens but when I close door, it stops and reverses, then the light blinks 10 times.

safety sensors are not aligned, or one of the wires to one of the sensors is broken or unattached, or sensor wires to the unit are broken or unattached. door will always open without sensors being correct, but will not close. try pushing and holding wall button and see if door will close, if yes, then it is the sensor wiring or sensors

Feb 20, 2016 | Building Materials

1 Answer

Just clicks and won't do anything

Trouble shooting a garage door can be confusing. If you have a hand remote go into the garage and cycle the unit. If you here the motor run than it is likely that the gears have stripped or the chain if so equipped has come off the track.

If you only hear a click or a series of clicks when operated with the remote then it is more likely that one of the safety features are active. The most likely is an obstacle in the path of the door. The transmitter and receiver of the led light and sensor safety feature are located at the bottom at either side of the door on the inside of the garage , . Look at the bottom of the door and see if something is blocking the in-farad light between the door,

Many of the receivers have an indicator light and as you wave your hand in-front of the sensor you can observe the sensor indicator light flicker. If the sensor has a light and it doesn't flicker the alignment may be out prohibiting the light sensor from receiving the signal. This would result in the door not operating. Initially try to clean the clear covers to see if that is the problem. You may need to realign.

Nov 21, 2015 | Building Materials

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

Lift master door will not close with remotes. to close door, the main switch in garage has to be held down until door reaches bottom. when using either remote or main switch, to close said door, the...

Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the small light on each sensor is lit and not flickering. Tweak them a bit. Check the wiring for breaks or shorts. Nothing else will cause this problem.

Dec 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman door opener. light flashing 10 times. must hold down the button to make it go up or down

There are 2 sensors that are near the bottom of the door tracks on either side. They have to "see" each other so it is likely that something is blocking one of them or one got bumped so they are out of alignment. Check to ensure nothing like a box lid or something fell in front of one of them then use the lights on them to line them up. Both lights should be on. Check to see if the door works at each step. If all this does not help check the sensor wiring for damage and if it has staples holding the wires to the wallboard it is possible that an errant staple is shorting out the wires to the sensor. Highly unlikely unless they have submerged in water a sensor itself may have gone bad. I hope this helps gets your door opener working. If this helps please vote yes, thumbs up. Thank you, Dean

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

1 Answer

My craftsman garage door opener will not close. It travels a short distance then reverses, lights flash. All indications are that this is a sensor problem, yet both sensors are lit brightly. The door will...

If the door does not close but only if you hold the button down then yes it probably is a sensor problem. Holding it in bypasses the sensors. Make sure the lights are on(sunlight will make it look like they are lit). Also make sure the surface it is attached to s secure. Watch the sensor as you press the button to make sure it does not shift. If it is not the sensor(s) or the wiring to them, it could also be in the logic board. I would start with the sensors. They are sold in pairs. You can find replacement parts at Thanks BB

Sep 18, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Need to add obstruction sensors to an older Craftsman Garage door opener that never cam e with them. Is this possible?

Generally not. To get the sensors alone would cost very near the price of a new unit equipped with video sensors. You could verify this with Sears.

Sep 02, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Receiver seems to be getting weaker

U can tries to clean the IR in the remote an the sensor box.Remove all electronics equipments close to the sensor box.Make sure the path is clear of clutter too.

Aug 25, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door sensors won't light up and their aligned

Yes the sensors can quit. There is also a possibility that it is the logic board that is bad. The only way to tell for sure is by substitution.

May 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

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