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

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Motor moves 5 in" and reverses and light blinks 5 times

I have a craftsman 1/2 hp that is about 2 years old. The learn light flashes 5 times and the door goes down about 5 inches and returns. No light bulbs flash(misalighned sensors) and i have tried reprograming openers and evertything else. In the manual it says replace rpm sensor-Idid two times-same thing. One of my sensors has no light at all- I think the bulb may be burned out; the light still comes on when i walk through it and i have put them within 10 inches of each other and still no light on one of the sensors.It was working with only one light for a long time. I have replaced the logic board about 6 months ago and dont want to do it again. The learn light does not flash 6 times indicating logic board problems. help

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  • meisbepat Feb 18, 2009

    I just bought 2 new door openers. I only installed the first one and am having the same issue. I get about 6" of downward travel then it reverses and gives me 5 blinking diag lights. No flashing unit lights indicating eyes, and both eyes have solid lights. I took it apart and swapped the rpm sensor with the other unit. Same thing, 6" of downard travel then it reverses and gives 5 lights. I'm to the conclusion that my only other option is the logic board, but the thing is BRAND NEW. Do you think it could really be the logic board?



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In the manual it says if you can hold the wall button down & door closes. You have a short in the wiring to the reciever eye. Try substituting some new bell wire in its place, or test the wires for continuity.

Posted on Jan 29, 2009

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Replace safety eyes

Posted on Jan 29, 2009


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My garage door opens fine but will not close unless I press down the button on the wall. The sensor lights are solid and I unplugged it for a minute and I'm still having the same problem.

If your main light flashes 10 times and the door reverses to the open position when you use your remote it is a door sensor problem. It is sometimes very hard to see if one of the sensor lights is flickering.

If the main light does not flash then you can try increasing the down force just a little. This control is on the rear of the motor unit near where all those white wires go.

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If the main light flashes 10 times when the door reverses it is your door sensors. Most probably out of alignment but they could always go bad. See if each of them has a small light that should be lit and not flickering. If one of them is out tweak the sensor a bit to see if it will come on. If not one or both is bad.

If the door hits the floor and reverses but the main light does not flash 10 times then the door is traveling too far. On the side of the motor unit you will find the 'down limit'. Turn this in the opposite direction of the arrow printed on the cover. Some adjusting may be necessary.

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4 Answers

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