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

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Mine does the same thing...

Both sensor lights (one green & one Orange are working.
The door won't shut unless I hold the main switch until it is completely closed. The remotes do not work to close the door...just the main button.
I've tried EVERYTHING from lube to alignments...nothing is working.
I get the same light blinks 3 or 4 times after the door fails to shut and retracts back open.

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If the main light is flashing 10 times you have a door sensor problem. Might be the wiring to the sensors. Nothing else will cause this flashing of the main light.

Posted on Jul 12, 2009


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If when closing the door it reverses to the open position and the main light flashes 10 times it is a door sensor problem. Make sure the small light on each sensor is on and not flickering ever so slightly. (check closely) Tweak them a little even though they may seem to be okay. Check for 5vdc between terminals 2 and 3 on the rear of the motor unit. If there is no voltage or if it is greater than 6vdc the logic board is bad.

Jul 29, 2012 | Sears Craftsman LiftMaster Chamberlain...

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Ok so I am having a problem with craftsman garage door, The sensor light are right on green and one orange, but i still have to hold down the button in the garage to shut the door. Also today i thought...

If when you try to close the door the main light flashes 10 times and the door starts down and then reverses to the open position you have a door sensor problem. Make sure the lights in the sensors are not flickering ever so slightly. The color of the lights doesn't mean anything. The keypad sounds like a separate problem. Make sure the battery is good.

Apr 07, 2011 | Sears Craftsman LiftMaster Chamberlain...

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One of the photo sensors in not working (No green Light). The garage door will go up... but not down unless you depress & hold the "button". I have removed & re-connected the photo sensor...

To my knowledge, the opener will not work without the sensors. They are there for the safety of anyone or pet that might wander under the door while it is in motion. They also will stop the door if there is an object in the path - if it is more than 6" in height.

The most common reason that the green light is off is that the two sensors aren't aligned with each other. One sensor sends out a light beam that the other receives; the completed circuit is made by that line of light not being broken. The sender has an amber light.

Try moving the sensor up/down or forward and back unitl the light comes on. Check both sensors. I've often seen them get out of alignment if someone bumps into them when trying to walk out the door around a vehicle. If you still don't get the circuit, check if the control wires are undamaged and properly connected to the opened. These are usually the white and white/black wires and could be damaged at the staples that keep the wires against the wall and ceiling.

I hope this helps.

Cindy Wells

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The machine is dead,nothing is happeneing,no lock door switch light,changed the fuse in the 13 amp plug????????

I have the same problem. It appears to be the interlock switch on mine. Had you had problems with the door not shutting properly & therefore not starting unless you slammed the door? If so could well be the same thing. The new piece cost less than £10.00 including P& P so worth a try.

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Garage sensor problem

The colour on the sensors doesn't change.
One is orange constantly and the other is green when detecting a signal from the orange sensor.
If the green is flickering, they are not adjusted correctly.Move the green sensor until you get a good solid green. Holding the wall pad button down, just bypasses the sensors.

Try adjusting only the sensors so that they are solid.

In addition, check the little yellow light on the back of the machine and count the flashes.
The number of flashes will tell you what the error is in your manual.

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Door ups and downs

Holding the button down just bypasses the sensors.
Your sensors are not adjusting correctly, or there is a short in the wires.
The back of the machine has a little yellow light, count the flashes and corelate it to the troubleshooting portion of the manual to confirm.

The orange light is a constant, the green sensor needs to be adjusted until you get a solid green light.

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