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

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By passing light beam sensors?

My light beam sensors don't work so I can't close the garage. Is there a way to by-pass them?

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There is no way to bypass the sensors.

Posted on Jul 28, 2009


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Where is the sensor eye and sensor light on garage opener

The only 2 sensors are located inside on each side of the garage door. Their purpose is to sense if there is a movement while the garage closes so it can interrupt the garage closing. That's in case you close the garage and someone walks in/out. Also some sensors also act as a "light switch". What I mean is that when the garage is open for a while, and you walk in the garage passing those sensors, it will turn the light on which is located on the motor.

Aug 01, 2014 | Building Materials

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.

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).

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

2 Answers

How do you align the safety sensors for a lifmaster garage door

The indicator lights in both sending and receiving eyes with glow steady if wiring and alignment are correct.
Connect the wires together on safety sensor receiver (with green indicator light), so it by-passes safety system.
The safety system consists of sender with amber light, and receiver with green indicator. Receiver must receive light in order to keep switch circuit closed. If receiver receives no light from sender, then switch opens, and garage door will not function.
Connect both wires on receiver will simulate the closed switch, as if receiver is receiving beam of light.
You can order replacement sensors from amazon

May 28, 2013 | Electrical Supplies

1 Answer

The sensor light are different colors

The sensors are seeing something directly in line with the beam between the 2 sensors, or your sensors are not aligned so they point directly at each other.

Jan 12, 2013 | Craftsman Sears Liftmaster Garage Door...

1 Answer

High beam passing lights

Hi Razorsedgesf, sounds like you have a faulty high beam element in your headlite bulb. Your passing lamps are suppose to turn off when your high beam is activated so as not to blind oncoming traffic. Good luck

Dec 28, 2012 | 2007 Harley Davidson FLHRC Road King...

1 Answer

I have 2005 softail as listed,was bought used,someone replaced front forks due to being in accident.the only thing not working is front running and turn signal lights. Passing lights work,headlight works....

No, the TSM does not have this function in it. It controls nothing but the turn signals. Whoever wired the passing lights in used the wire for the high beam light as a power wire for the passing lights. This was probably done so that they would not overload the charging system. If you have the high beam light and the passing lights on, it's a tremendous draw on the charging system and it may have caused a fuse to blow. So, they probably wired the passing lights to operate without the high beam light. I think the wire is white for the high beam.

Good Luck

Apr 11, 2011 | Harley Davidson FLSTC - FLSTCI Heritage...

1 Answer

Uh70015 dirt sensor stays on green. Goes on red for about 5 seconds then green. Can clearly see the floor is dirty and it is picking up stuff.

ahh the good ol electronics on vacuums selling the product again...

not to worry, your feature is working properly, your vacuum is working fine too.

Imagine if you will making a circle with your pointer finger and your thumb. Now put a string or thread across in a straight line there. The string would be the size of the beam of light that the sensor uses. Your finger and thumb are about the size of the tube that the dirt and dust is passing by. Unless the dirt passes and cuts through the beam of light, then it will register. otherwise if it passes around the beam of light, the sensor thinks your carpet is clean.

The opposite sometimes will happen too where it will stay constant red. That means that the sensor is completely covered in dirt and will not register anymore.

Hope this helps.

Nov 11, 2010 | Hoover UH70015 Bagless Upright Cyclonic...

1 Answer

How do I uninstall my garage door sensors. They continue to give me problems, it acts like there is something in front of the sensor and prevents the door from closing.

When you say sensors, are you talking about the photo-eye that checks if obstruction is in path of garage door?

1) You can buy sensors for $20-30. They seem generic

2) The new openers may be set up so by-pass is not an option.
Solution: In that case, you can move sensors above the garage door and put them face to face to see if that helps.

3) The way the sensors work is this. One side produces beam of light. Other side receives light. The receiver keeps a circuit closed at all times when light is received. If no light, then the circuit opens up and an electronic part interprets the lack of signal and turns off opener.

Solution: one side produces light. It does not have a switch. The other side has the switch. You can disconnect (or cut) a wire see which side has the light. The other side has the switch ... cut the 2 wires on the side with a switch, cap them off, and then see if opener works. Next twist the 2 wires together and see if opener works.

4) Fall-back position: Mark your wires and you can put it back the way it was.

Oct 06, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door won't close with remote and I have to hold the pad to make it go down, however it opens just fine.

Your safety reversing sensors must be connected and aligned correctly before the garage door opener will close. An obstruction in the path of the sensor will also cause your door to not close.

This sensor is an electronic beam, which is sent between two sending and receiving "eyes". These eyes face each other and are located just inside your garage door. They may need to be adjusted so the beam from the sending eye is properly detected by the receiving eye. Once the receiving eye "sees" the beam from the sending eye, a green indicator light will glow on the top of the eye. Tweak them a bit. If both lights do not come on you have bad sensors.

Sep 24, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 HP Starts AND Stops Going Up or Down

with the age of the door, chances are it just doesn't move as easily as it once did causing the built in limiters to stop the door. the limiters are designed to stop the door from crushing something or someone if the safety beams fail and there is an obstruction in the path of the door. Some units allow you to raise (increase) the force used to move the door. Most times the adjustment screws are hidden either behind the light lens or behind a removable panel. The limiter screws are NOT the screws used to adjust the travel of the door. If you don't have the manual for the opener, you may be able to download one to assist in locating the correct screws if the opener has this adjustment. As far as by-passing the safety beams, just place a jumper wire in place of the safety beam receiver.

Please take the time to rate this solution.

Thanks for using Fix Ya.

Jan 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

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