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

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We have 2 sensors. 1 has a green light and the other has no light

We have 2 sensors. 1 has a green light and the other one doesn't have a light. The garage door would go down 1/4 of the way but vome back up. Then the light connected to it blinks 10 times. It'll only go all the way down if you hold it down until it shuts.

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  • jason May 11, 2010

    have you tried readjusting the tension adjustment ?

    or have you looked to see what might be causing it to have strain ?

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Your safety eyes are out of ajustment. Make sure that the eyes are pointing directly at each other. A light will come on on each eye when they are properly aligned. The only other thing that could be wrong is that one of the safety eyes could be bad, and the only thing you can do is replace the eyes. 99% of the time the problem is an alignment issue. By holding down the wall button, you are overriding the safety eyes.

Posted on Mar 06, 2009

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The does not completely close and one light is green and one yellow i see no disruption. then it opens up again what can i do?


Color of lights doesn't matter. If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are not flickering ever so slightly. Tweak them a little. On the rear of the motor unit there is a small LED. Check to see if it is flashing a code. It will flash a number of times, pause and then repeat. Near where that LED Is you will find the down force adjustment. Increase it about 1/4 turn and try. If the LED is flashing code 5 you most likely have a bad RPM sensor board which is a small printed circuit board just in front of the motor.

May 15, 2011 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

DOOR CLOSES MOST OF THE WAY AND THEN OPENS. LIGHT THEN BLINKS TEN TIMES. I NOTICED THAT ONE SAFETY SENSOR IS GREEN AND ONE IS YELLOW. PLEASE ADVISE.


Hi. The sensor with the yellow light is telling you that it is miss-aligned, Usually it only takes getting bumped to knock them out of alignment.
I would slowly turn or adjust the positioning of the sensor.
The one with the yellow light should turn green when it is all the way in line so that the beam is completing it's path.

It's out of adjustment, so the sensor is looking at it like there is an object blocking the door from closing.
It's called the obstruction sensor.
It's there as a safety feature, so that the door doesn't come down and smash anything in the opening.

I hope this helps you out.

Feb 04, 2011 | liftmaster Garage Door 1/2 Hp

1 Answer

Liftmaster 1/2 horse Model HBW0777 acts like the safety sensor is stuck (door won't continue down - re-opens when you let go of the wall button. I can close it with the wall button but I need to hold it...


If the main light flashes 10 times when the door reverses it is a door sensor problem. Look closely at the green lights to make sure one isn't flickering ever so slightly. Tweak them a bit.

Mar 22, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

We have a 1/2 hp garage door opener and it is blinking 4 times. it will shut with continuous pressure on the button but not with a single press. the sensors are different, one has a continuous yellow light...


The most common reason for the green sensor to flash is because they are not pointed directly at one another.

  1. Check each sensor for a steady glowing indicator light. If both indicator lights are on, or if one indicator light is flickering, the sensors may be slightly misaligned. To check for misalignment; obstruct the beam of the sensors so that they cannot see each other. When the beam is blocked, the indicator light on one of the two sensors will temporarily go out. This is the receiving sensor. Remove the obstruction and loosen the wing nut on the back of the receiving sensor. Adjust the receiving sensor until the green indicator light goes out, if not already out, then realign until the green light is bright and steady, then retighten the wing nut. This usually takes a couple of attempts before it is back in alignment.

Jan 01, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have the 1/2 horsepower opener with the green (Sears)


Sometimes the sensors will be aligned closely enough that the logic board will turn on the receiving units light but it will act like yours. If you look real close at the light you will see that it is flickering ever so lightly. Tweak the sensor so the light is on steady.

Nov 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 HP garage door opener with one green and one yellow


It sounds like a logic board problem to me. I would remove the board and look for bad connections especially around that small transformer.

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

1 Answer

New eye sensor not lighting up when installed


Make sure the sensors are pointed at one another. Also one of them should say "sending unit" and the other is the "receiving unit". Did you buy them new and from a dealer?

Jun 10, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sensor lights are steady grn - have to hold closer to close


My service shop says that the sensors can go bad and still have the lights on steady. Also sun lite on the receiver sensor (green led) can cause a problem or if they have gotten wet.

Play with the alignment and if still a problem new sensors are about $40 a pair. Or if you have another door that works OK, swap the sensors to see if that is the problem.

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

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