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

1 Answer

Liftmaster 1/2 HP opens on its own

I have a 6 month old unit that seems to have a ghost. I have come back from some trips to the store to find my garage door open to the world. At first i just assumed it didnt close fully and reversed when I left so I have become diligent now about watching the door close completely. Today I came back after a 2 hour trip and it was open again and I definitely saw it close, as did my passenger. Any ideas how this can be happening. I thought these new remotes have zillions of codes that reprogram themselves so theres no possibibility of a neighbor with the same code?

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  • srdiamond Jan 19, 2009

    My remote is the 373LM which is listed as a 315mhz. Is that good or bad? I only have 1 remote and it stays on my visor so no way it gets pushed accidentally. Plus if it was stuck i would see it opening when I pull away - I literally sit and watch the door shut every time as I have for the last few months so I would see if it opened right away.

  • srdiamond Jan 19, 2009

    I would say once every month or two I notice it. What are the red wires at the motor and should I permanently disconnect them or just temp?

  • petey007 Feb 01, 2009

    when I press my keypad the motor run but the chain does not travel the product is liftmaster profesional line

  • Vince Heuser May 11, 2010

    Do the remotes run on 390mhz or 315 mhz? It should be in the owners manual

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5 nonth ols ia 315. wjere are remotes. on car seat? are pushbutton stuck. try disconnecting wire to each pushbutton or console. see if problem goes away. you have 100 billion codes

Posted on Jan 19, 2009

  • marty metzger Jan 19, 2009

    try disconnecting red wires at motor. how often this happening.

  • marty metzger Jan 19, 2009

    they goes to pushbuttons and wall control. if you have push-on terminals, just remove and leave out. wouldn;t hurt. see if problem stops (That is why i asked for frequency).

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1/3 hp liftmaster pro goes up 1 ft and then closes, need to press a couple of times to work.


After checking all the door parts; alignment, missing nuts and finally adjusting the spring we found a defect in the door opener (new replacement). There's a speed sensor that was hitting the cover and this was causing the door to go up or down only to a certain point. Sometimes it would stop and other times it would totally reverse. I made a small adjustment to the speed sensor and voila it's been working since. Now if I can get the wireless click pad to work I'll be back to the norm. Look online for a schematic if you don't know what the speed sensor looks like. These companies also sell just the parts if you want to repair your old opener. I hope this cures your problem.

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Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor unit and will be obvious if it is bad. The part number is 41A2817 and is available from any door opener service company. The part will come with instructions.

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Motor runs but door won't open. checked chain, seems to be ok


Hello,

The problem is not the chain, it is the plastic gear in the unit of the liftmaster Garage Door 1/2 Hp.The plastic gear is not engaging, although it sounds like it is working.

You will have to replace it with a new one, then the liftmaster Garage Door 1/2 Hp will be able to open up once again.

Once you open and remove the old gear, Be sure to thread the screws in all the parts before you install them. Pre-threading them once would really help. Secondly, label the wires on the back of the opener before lowering it to the ladder, so you can put them back in their proper place.

Hope this was helpful.
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1 Answer

White ghost screen only 1/1/2 years old started going to white screen occasionally at 6 months old just for a few seconds now gives only white ghost picture.


It can be the ribbon cable on the T-CON board is looseor it is not getting 5vdc from the logic board to feed the T-CON board.
http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/

You will need to open it up and take a look inside. It may be still under warranty.

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I have an old craftsman 1/2 hp door opener. It


You may have a bad wall control. Try disconnecting it from the opener and try. Otherwise it is time for a new model.

Apr 26, 2010 | Sears Craftsman LiftMaster Chamberlain...

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It has probablly lost sync.

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2 Answers

Door openly opens 5-6 in, then stops.


If the door isn't unusually heavy when you open it manually then maybe an adjustment will help. On the back of the motor unit you will find the 'up force' control. Increase it 1/4 turn and try.

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1 Answer

Electrical problem with logic board or terminal block


do you see burn mark on board? Is so and unit is older than 15 years, buy new one.

Feb 12, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftsman Garage Door Opener Wireless Keypad Model and a LiftMaster Chamberlain Professional Garage Door


Hello,

I had the same frustrating dilemma with my Craftsman LiftMaster garage door and Keypad, Model 139.53754-01 (dated 10/06; and has the # 315 MHz).

To resolve “the dilemma”, grab your keypad, climb up on a ladder to access the garage door opener’s motor unit. On the right side of the motor unit, remove the white plastic casing by pressing buttons on each side and pulling down. This will expose the programming area, and for our purposes, the “Learn” button.

1. On the motor unit, press and release the “Learn” button. The Learn indicator light will glow steadily for 30 seconds.

2. Within 30 seconds, enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold the ENTER button.

3. Release the ENTER button when the motor unit lights blink. The code has been “learned”/stored/activated.

Good Luck, and I Hope this Helps!
Gail
For possible future reference:

How to change an existing, known PIN
(Changing an existing PIN can be done with the wireless remote keypad, and does not require access of the motor unit.)

From the keypad:

1. Enter the four digits of the present PIN, then press and hold the # button. The opener light will blink twice. Release the # button.

2. Enter your new 4-digit PIN and press Enter. The motor unit lights will blink once when the PIN has been “learned”/stored/activated. Test by entering the new PIN, and pressing Enter.

May 10, 2008 | Sears Craftsman LiftMaster Chamberlain...

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