Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo
Posted on Oct 04, 2007
Answered by a Fixya Expert

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Garage door opens by itself

I have come home now a couple of times to find my garage door opened by itself. It was closed when I left the house. Am I on a similar frequency to my neighbors? or is something shorting?

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  • driverfound Apr 07, 2008

    On several occasions now we too have come home to an open garage door that was closed when we left. We have checked the remotes for jamming but neither is a problem. We locked the door from the key pad but are still having the door open on it's own. We do not believe any of the neighbours have the same opener so we don't think this is the problem either. Any suggestions??

  • dsimod Sep 27, 2008

    I have the same problem. I watched my door close today after work, went into the garage at midnight to get something, and the door is wide open. Glad to have found this site, and I will try these suggested fixes in the morning when I have some daylight. Cheers!

  • nubom Apr 28, 2009

    Garage door opens by itself. Some days it happens continuously within 5 to 10 minutes of closing it And every time it opens by itself I have to disconnect power to get it working again. I finally left it unplugged over night and plugged it back in to leave for work and it was fine for a week but then it started up again.

  • Anonymous Mar 30, 2013

    This is caused if the power of the Garage Door Opener turns off and turns n again. This mainly happens to some old openers.So firstly check if there is any electric supply faulty in your house, if there is not any faulty then open up the unit and get a Electronic Cleaner and spray it on the mother board. This is because sometimes the opener gets dirty inside and the dust makes it faulty.

  • Anonymous Aug 24, 2013

    i just cleard my door opener hope it works whish me luck

  • Carmen Sandiego
    Carmen Sandiego Jan 03, 2014

    If you're still having problems I suggest checking out . They did a great job of fixing my garage door and at reasonable prices.

  • Alex Nunamaker Dec 07, 2018

    I think you have to decrease the down travel limit because my garage door was going up by itself about a week ago and I decreased the down travel limit and it worked.

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  • Posted on Mar 12, 2008
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From Chamberlain's website:

There are a few different things that can cause this type of problem.

  1. Look at the LED light next to the SMART/LEARN button on the motor unit. If you are facing the garage door, the SMART/LEARN button is located on the rear end or right hand side panel of the motor unit. You may need to remove a light lens cover in order to see it. This button is either purple, red/orange, green, yellow, grey, or white in color. If the light is flashing rapidly this means you have a stuck button on one of your remote controls. Take the batteries out of each remote control. When you remove the batteries from the bad remote, the light will stop flashing. This remote needs to be replaced.
  2. If one of your neighbor's remote controls is inadvertently programmed into your receiver, your door will open when their remote is activated. If this happens you will need to clear out your receiver and reprogram your remote controls:
    1. Press and hold the LEARN button for six seconds, or until you see the small LED light near the button turn itself off.
    2. If the above steps have been followed and the symptoms continue, there may be an electronic short in either the wall control button or the receiver logic board. In this case, remove the wall control wires from terminals one and two (or red and white) on the motor unit. Should the symptoms persist after the wires are removed, replace the receiver logic board. If the symptoms stop with the wall control wires removed from the motor unit, replace the wall control button, and the wires leading to the wall control button.

  • Andrew Peterman Sep 03, 2012

    My green led is blinking fast. I've removed batteries from all remotes. The Light does not stop blinking as you say.

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  • Posted on Jun 07, 2010
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When my door did this,it needed the down force increased.i quess i adjusted it too soft during the hot summer because it was not until the cooler fall weather {oct} when it started operating on its own.so,i would suggest{ before calling a door company} to check the up and down forces and the up and down travel limits.also test the safety reversal system.with the door fully open, place a 1-1/2 board {2x4 laid flat}on the floor, centered under the garage door.operate the door in the down direction.the door must reverse on striking the board. dean c. {louisville,ky}

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  • Posted on Aug 03, 2010
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Some older remotes use 9 bit encoders like the HT6026 that only generate 512 different codes. They transmit in the range of 433MHz and it is a open license radio band congested with cordless phones, hundreds of remotes in the area that can cause one of the 512 codes to be triggered. Electronic failure due to manufacturing, electrical surges, thunderstorms can also cause erratic behavior in receiver units. EMF from machines can possible generate enough RF waves with random fluctuations that can trigger remote events. Newer remotes are better by using rolling code features but even they are not fail-proof since the receiver can still go faulty. No electronic device is fail-proof and one should always take great care before relying personal safety or security on remote control devices.

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  • Posted on May 19, 2009
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Try checking the closed limit switch setting and the force adjustments on the opener.

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  • Posted on Jan 15, 2009
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I had this problem several years ago.  I read about a possible cause on the Internet and after thinking about my own experience, I think mine was caused by gas-powered blowers emitting noise that confused the simple analog door opener I had at the time.  
I bought a new Genie Intellicode upgrade kit & retrofitted that to my existing opener mechanism.  I have never had the problem since.  I think blower theory sounds a little sketchy but I have no other explanation.  In any case, the Intellicode remote upgrade solved my problem.

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  • Posted on Jun 27, 2013
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Adjusting the downforce also fixed this for me. My user's manual had pretty detailed instructions on how to adjust this. Mine was hitting the 2x4 on the ground and not going back up. Once I adjusted it so it went back up after hitting it, the door stopped randomly opening on its own.

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  • Sears Master 2,029 Answers
  • Posted on Jun 12, 2016
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For the people who have great heavy overhead garage doors be aware to do not repair on the motor /hand operating unit by yourself
Actually hear garage doors overhead doors such as garage doors s not under the fixya column for do it yourself repair because of a General Duty Clause can be applicable


Suggest brands like experienced by a specific model Crawford this units can have much problems that repeats every year again and again i have experienced that on the place where i am working and its every time again its an expensive job , but i have searched the defect but stop this activity because of safety clausules i have reading and know of very dangerous situations and accidents if so there are plenty of other brands that do have a better product with a special safety compliant thats equivalent fitting on the same overhead-door we will chose that but, stay away from self-recovery in the electric unit by doing yourself by this doors also not more to do then only do not more what the manual prescribes, if others are unwittingly a victim may because of the safety you cannot serve this kind of units by yourself (if there are others who may operate this door to, If the control seal ( paper label or red or black paint sealant) if thats broken which is in the motor unit and or hand control to present and there arises a personal accident through a door with whatever happens what and who intervenes and the door turns on and doesn't stop, the insurance pays a dime damage at a follow-up investigation as there is found to be improper working inside the unit.
only to say beware of the special way of safety

a real happend thing translated : Rb, part dispute: employer liable for any accident involving unsafe roller door in rented premises

Employee gets rolling door in which security cable failed on his head and walks injuries. The Subdistrict Court held that there had been an unsafe situation because no security was present at the roll-up door. This is employer liability under art. 7: 658 DCC a given, unless the employer can demonstrate that it has fulfilled its duty of care. Defense that the employer as a tenant Attn the building and the roller door had no security requirement, and that it was entitled to assume that the building was safe rejected. Even if a building is rented, the security obligation of the employer extends over the building. Cost partial dispute: € 5,692.50.

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  • Posted on Apr 16, 2016
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The wall controller can stick if pushed on the side or corner. Then any slight vibration such as a truck going by will activate the opener. On my Sears wall unit I pried off the plastic push button and put a spring (from the hardware store) inside to help push the button back out after use.

A

Anonymous

My garage had a similar problem a few years ago. It turned out the sensor was getting tripped by something. We couldn't figure out what it was, so we ended up calling a garage door company to come out and take a look at it. http://www.aceoverheaddoors.ca

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Note: For us, the garage door opener repair technician had to replace the sensors, even though they seemed to be aligned.

Hello, Wayne -

A few years ago we experienced a similar problem with our garage door. We had to call for service on the garage door opener. Fortunately, the previous owner of our home left a business card for the company which serviced the garage door when they owned the home. They left the business card tucked in behind the garage door opener power button on the garage wall.

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In most cases, when a garage door opens or closes by itself, or when you find your door open, upon returning home, the problem is due to a short somewhere. This short is most likely to be in one of two places: either in one of your transmitters or in the wall button or its wiring.
When there is a short in your garage door transmitter, you will often find the garage door is up upon returning home, even though you know you closed the door when you left the house. A short in your transmitter causes a continues signal to be sent. As you are pulling out of the driveway the garage door closes fully and appears to stop, but as the carriage and arm run past the down limit and hits the header bracket it reverses, and the door begins to open, just as you start driving off down the road. You come home to find the garage door is up, as if someone else had opened your door. The best thing to do to troubleshoot the garage door problem is remove the batteries from your transmitters and try operating the door from the wall button. If the problem is intermittent, you may want to do this for a day or two to eliminate the transmitters as the culprit.
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Garage door opens whenever it wants to

In most cases, when a garage door opens or closes by itself, or when you find your door open, up returning home, the problem is due to a short somewhere. This short is most likely to be in one of two places: either in one of your transmitters or in the wall button or its wiring.

When there is a short in your garage door transmitter, you will often find the garage door is up upon returning home, even though you know you closed the door when you left the house. A short in your transmitter causes ta continuous signal to be sent. As you are pulling out of the driveway the garage door closes fully and appears to stop, but as the carriage and arm run past the down limit and hits the header bracket it reverses and the door begins to open, just as you start driving off down the road. You come home to find the garage door is up, as if someone else had opened your door. The best thing to do to troubleshoot the garage door problem is remove the batteries from your transmitters and try operating the door from the wall button. If the problem is intermittent, you may want to do this for a day or two to eliminate the transmitters as the culprit.

If the problem persists, try removing the wall button wire at the motor head to ensure it is not a short in the wire to the button, then try operating the garage door with the transmitters only. If it stops the problem, replace the wires and test the wall button which can also go bad. It is a process of elimination.
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Garage door opens by itself

Sounds like the Logig board is going bad in your unit.
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Opens when we're not at home

Here is the manual, so you can change your code. This should FixYa:) Let me know if you need more help!

http://lib.store.yahoo.net/lib/aaaremotes/976LM-manual.pdf

Thanks!
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