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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Learn light is blinking in a serise of 4 times.


The light is sending the code for:

Safety reversing sensors slightly misaligned (dim or flashing LED).


Tweak the sensors to make sure they are pointed at one another and both lights are lit and not flickering. If your opener is working okay then you may just need to unplug it for about 5 minutes and it should reset so the blinking light quits.


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

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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.

Check the small LED near the smart/learn button. If it is flashing a code of 5 blinks then a pause and 5 blinks it is the RPM sensor. This is a small printed circuit board just in front of the motor.

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1 Answer

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