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

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Sears craftsman 1/2 hp garage door troubleshooting

Our garage door is not opening with the wall unit or remotes. When I push the wall unit I hear a click from the ceiling unit. The door operates fine manually. The green light on the ceiling unit (the SRT button I believe) keeps blinking periodically. The wall unit has a green light that is lit (not blinking). I've tried holding the SRT button since it appears it needs reset somehow but that hasn't worked. Any suggestions?

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  • BadHardDrive Aug 18, 2008

    I'm having the same issue after a recent storm and subsequent power outage. I am leaning toward a fried circuit board, but I'm not sure how to confirm that.

  • kieljd Aug 25, 2008

    Did this solution work? I am having the same problem after an intense storm. The wall unit has the green light and when it's pressed, there are 2 clicks, I press it again, no click, I press it again another 2 clicks, etc. and the wall unit opens the garage after I press it 2 - 6 times. The same applies to the keypad, remote and car intelligent unit. Recently, it is taking more than pressing the wall unit 6 times before the garage opens. It works fine manually. Help. Do I need to buy a new garage door opener? I have a craftsman 1/2 hp. Thank you

  • Eli Wittner Sep 01, 2008

    Hello, I have the same problem. Opener is Craftsman 139.53963SRT 1/2 HP screw drive unit, bought in 2000. Motion sensors work (green led on receiver goes out when something is placed in the path). Green LED constant on wall opener. Wall opener will not operate the lights. After removing and re-applying AC, pressing wall opener once does nothing. After that, each time button is pressed, I hear 2 clicks (relay on, relay off), then the yellow light next to the reset button flashes 5 times and continues to flash 5 times. Reset button does nothing. I have replaced the RPM sensor (as recommended for 5 blinks), but no change. Any suggestions would be appreciated.

  • Sloan Valve Sep 05, 2008

    Similar to above. No obstructions. Have increased down power. Have removed chain for out of phase resolution. Did see/smell smoke at one point - but motor still runs. Tried adjusting down position screw also. This all started when I was trying to program a new remote - coincidence?

  • Anonymous Sep 20, 2008

    I have the exact same problem

  • nyman Sep 21, 2008

    im having the same problem,,green light on back of opener flashed,,but motor wont work? im trying to find out how to adjust the door so it stops where it belongs both open And closed

  • djw75043 Dec 12, 2008

    at least a 15 year old unit. can we fix it ourselves or do we have to call a pro???

  • yuehanb1 Mar 07, 2009

    Same problem. Motor clicks and hums but no movement. Does something need to be reset or replaced. Model 139.53535SRT1

  • David Corona Mar 14, 2009

    I have the same problem. The light on the opener blinks eradically. Tried reprogramming the remotes, but that didn't work. When I press the wall button and the remotes I hear what sounds like a switch moving but nothing happens. The light switch on the wall unit doesn't turn the light on either, even though I can hear the switch in the unit moving.

  • David Corona Mar 14, 2009

    Craftsman garagedoor opener is not working. I can hear the switch in the unit clicking but nothing moves. Door moves freely when disengaged. Tried reprogramming the remotes but that didn't work. The light swich does not turn the light on even though you can hear the switch moving in the unit up top. SRT light keeps blinking. I don't recall it doing that before.??

  • Anonymous May 06, 2009

    garage door will not go up or down when using the remote or pad light is green on the pad and on both sensors . when pad or remote is pressed it blinks twice and shuts off.

  • sammyb1421 Sep 11, 2009

    How do I program my keypad with purple learn button

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14 Answers

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My garage door opener will start to close then stop and go back to the open position. If I put pressure on the door as it is closing sometimes it will close all the way and sometimes it will return to the open position. Can you help me. Thanks pbstation771@verizon.net

Posted on May 13, 2010

  • Eugene Dean
    Eugene Dean Mar 17, 2015

    Did any of these solutions work for you? My garage door is doing the same thing. At first, I thought it was the sensors, but the little lights are green. It sounds like one person was able to fix it by replacing the main board. For $70, I might just buy a new opener. http://www.valleyalldoor.com/

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Our garage door does not close, the light on the closer blinks about 10 time everytime I try to close it. How do I reset the opener?

Posted on Sep 04, 2009

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Craftsman 3/4 HP garage door opener --- door goes down but won't stay down it opens on its own. After several attempts (pushing the button) it will stay closed. What's up?

Posted on Sep 08, 2009

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I've got a similar problem. The green light is flashing on the unit. I can here a click when I try either the remote or wall mount switch, but no movement.

FWIW our wall switch has a lock and a light switch and I can't get the light to go on either.

The door moves freely when disconnected from the opener.

My gut tells me the logic board is fried. What I'd really like to find is some sort of trouble shooting guide - Is anyone aware of any trouble shooting information on these lifts?

Posted on Aug 24, 2008

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I got two crafstman half horsepower door openers that are within 3 years old each. just today the second one began suffering from the same problem that the first has succumbed to. I understand how to install the units in terms of proper up and down travel lengths and down and up force, but now with the down force at maximum both door openers refuse to close and send the door back up and blink the light as if the track is seized. i release the trolley and the travel seems to be fine they operate up and down by hand as much as i want.

I don't really know anything about maintenance or proper settings of the existing counterbalance parts since i didn't install those and they have existed since the time of the garage being built in the 70's. The springs are fine though and not broken. Could it be that half horsepower just isn't enough torque and it keeps tripping on overload now that they have worn in?

should i have gotten three quarter horsepower openers?

i'm stumped.

Posted on Jul 23, 2009

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We replaced the battery in the transmitter but it still won't operate the door. We unplugged the opener, waited , replugged waited some more and it still does not work. What now?

Posted on Oct 28, 2009

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I replaced the batteries in my opener, the garage door won't work, how do I re-set it ???

Posted on Nov 05, 2009

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I had a similar problem.... the light on the opener flashed a bunch of times, and it wouldn't close.... my issue turned out to be the sensor had unplugged, so once I hooked that back up, it worked just fine.

Posted on Sep 07, 2009

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Have you checked the motor power setting? the alignment of the door sensors? something blocking the sensors?

Thanks

Ken

Posted on Aug 18, 2008

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Replacing the main board worked for me. It cost me about $70 and took 10 minutes to replace.

Got it from http://www.1stdooropeners.com/ and received next day with 30 day guarantee.

Good luck!

Posted on Sep 19, 2008

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Programming ... press and hold the SRT button (on the drive unit) for 6 seconds until the small indicator light beside it goes out ... this clears all codes. Take the remote, press and hold the button, the indicator light on the drive will start blinking ... press and release the SRT button, the main light on the drive unit should flash once ... then you can release the button on the remote. Remote is programmed. For the keypad, type in the 4 digit code you want to use and press and hold the enter button ... indicator light on drive unit should start flashing .... press and release the SRT button ... main light flashes ... release Enter button on keypad ... done.

Posted on Jul 07, 2010

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Be absolutely sure that nothing is in the way of the sensor. Clear of any objects for example like the tip of the handle of a snow shovel.

Posted on May 09, 2009

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  • 18 Answers

For garage door repairs try garagedoor-guys.com

Posted on Nov 17, 2014

I have lost the directions to change my pass code on the key pad can someone help me out

Posted on Sep 19, 2008

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Check the sensors in the doorway. They should both have a small light that is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors.

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Check to see if the trolley (the part that slides back and forth on the rail and is connected to the door) is jammed against the bolt just in front of the motor unit. If so, remove the bolt and run the door until it is closed. On the side of the motor unit there is an 'up limit' control. Turn this 3 turns in the opposite direction of the arrow printed on the cover. Be sure to replace the bolt.

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Could be a bad wall button or a smashed wire.
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If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door or interfere with the remote.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation / interference stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

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