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

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Access Master Garage Door Opener opens by itself

The Access Master Garage door opener opens by itself at random times. The opener was installed when the house was built in 2005 so I assume it was a 2005 model unit.

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The most common cause of this is a bad wall control or the wiring going to it. The wall control goes bad from use and the wiring sometimes has intermittent short caused by the staples the installer used.

Posted on Jul 31, 2009

  • bestcar53
    bestcar53 Aug 27, 2014

    Don can you please help me, can you please tell me who i have to call in reference to getting my automatic roller door opened please, as i had a power failure this morning and my garage door will not open and i have no way of accessing it. I really need to get my car out of the Garage thanks heaps Roslyn

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Posted on Jan 02, 2017

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1 Answer

How to change code on the garage door opener and the remote control on a lift master garage door opener


If you have a 315MHZ LiftMaster Garage door opener do the following:
Follow the purple wire (Antenna) up and you will see a square purple button.
Press and hold the square purple button for ten seconds until the amber led goes out.
Press and release the purple button one time (The amber led will come on solid).
Press and hold the button on the garage door opener remote control for two seconds (The light bulb on the garage door opener will blink and you will hear a click sound the amber led will go off).
to program the wireless keypad do the following:
Press and release the purple button one time (The amber led will come on solid).
Enter a four digit code into the keypad then press and hold the enter button for two seconds (The light bulb on the garage door opener will blink and you will hear a click sound the amber led will go off).

Aug 08, 2014 | liftmaster Lift Master 377LM 376LM 315 MHz...

1 Answer

Why does my LiftMaster garage door opener open the door at random?


basically,first check and clean the lid switches or sensors and or got broken switch and not on it`s proper position.

Jul 23, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Craftsman ( Liftmaster) door opener that all of a sudden one night opened our door by itself. I closedd the door and in a few minutes it opened again. It continues to do this at random times. I...


Make sure it isn't the wiring to the wall console by removing the connection at terminal #1 on the end of the motor unit. Staples used in installation can cut through the insulation and cause this problem.

Apr 05, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Access Master 1/3 HP garage door does not close, blinks


Most likely your door sensors are out of alignment. Make sure they are pointed directly at one another.

Apr 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Blowing out light bulbs


There are rough service bulbs you can buy at hardware stores. You can also try unplugging the unit and using a small screwdriver pull out on the center contact in the light bulb socket.

Sep 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Opener Model 3255 Chamberlain Lift Master


The most common cause of this problem is a bad wall control the wiring going to it. You can eliminate both temporarily by removing the wire at terminal 1 on the back of the motor unit. The wiring sometimes is shorted by the staples the installer uses. The wall control gets used a lot.

Jun 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opening by itself


Anytime a door opens and/or closes by itself I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door.

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 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.

Mar 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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.

Dec 16, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My lift master garage opener opens randomly


change the security code in the opener and the remote.
seems like omeone in your are have the same frequency remote.

Nov 12, 2008 | liftmaster Chamberlain Garage Door Opener...

5 Answers

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!

Nov 03, 2008 | Sears Craftsman LiftMaster Chamberlain...

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