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

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Craftsman 139.18415 opens intermittently by itself why? Can I change the Channel?

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You can't change the channel but here are some things to look at.

Look at the LED light next to theSMART/LEARN button on rear of the motor unit. You may need to removea light lens cover in order to see it. If the light is flashingrapidly this means you have a stuck button on one of your remotecontrols. Take the batteries out of each remote control. When youremove the batteries from the bad remote, the light will stopflashing. This remote needs to be replaced.

If one of your neighbors remotecontrols is inadvertently programmed into your receiver, you doorwill open when their remote is activated. If this happens you willneed to clear out your receiver and reprogram your remote controls.Press and hold the smart/learn button for 6 seconds or until you seethe small LED light near the button turn itself off. If the abovesteps have been followed and the symptoms continue, there may be anelectronic short in either the wall control button or the receiverlogic board. In this case, remove the wall control wires fromterminals 1 and 2 on the motor unit. Should the symptoms persistafter the wires are removed, replace the receiver logic board. If thesymptoms stop with the wall control wires removed from the motorunit, replace the wall control button, and the wires leading to thewall control button.

Posted on Jun 07, 2010


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Hello fieldon68, & to all the rest with the same problem.

There are many things that could be wrong, but intermittant discounnects sounds very much like a interverance from another wireless device. (ie phone, cell, etc)

To try to address this issue, follow the steps below:
Note : The steps below are applicable only for Belkin routers.
  1. Open an Internet Explorer window on your computer and type in in the address bar. This will take you to the Belkin router's web based configuration page. If you are not able to open the page click here.
  2. You will get a login page. Leave the password blank. Click Submit ( unless you created a password, then enter that).
  3. On the left side of the page, click Channel and SSID below Wireless .
  4. The wireless channel on the Belkin router is set to Auto by defualt. Change the wireless to a static channel. Click Apply Changes .
  5. Click Logout in the top right hand corner.
Note: The wireless card in the computer will automatically detect the change in channel number on the router and will update the channel on the card.
CauseYou get disconnected wirelessly mainly due to an environmental interference. When the wireless channel is set to auto, the router will cycle to though channels when it detects significant interference. When the router changes channel the wireless connection will reset itself and disconnect all wireless clients connected to the router. Wireless signals are prone to interference from cordless phones and electrical appliances (e.g., vacuum cleaners, microwave ovens). This is one of the more popular reasons Belkin wireless connections can drop. Good Luck Mark P.S. Please leave a rating.

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Keypad garage door opener will not operate

what keypad are you using with new opener? Frequency has changed. can't use old one. you probably never needed to change things; just needed to follow proper coding procedures.

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