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

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My liftmaster 3280 opens by itself occasionally. I have tested springs and they test fine.

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Change the codes on the remote and of course the lifter itself, sounds as if some one in the neighborhood has programmed the same codes nearby.

Posted on Jan 02, 2011

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Posted on Jan 02, 2017

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1 Answer

Liftmaster GDO goes up 1/2 way and stops,springs are fine.


The Liftmaster openers have 4 movement switches, a )opening and b) closing limit and c) opening and d) closing force. First check the door for smooth operation by opening the door by hand (disconnect from the opener with the release cord). Any binding should be felt this way. It is possible for a binding hinge, roller or torsion springs to add too much drag and cause the force switch to shut off the motor. Hinges, roller shafts and torsion springs should be lubricated at least annually with a non oily spray (silicone or teflon spray). Not WD-40 or 3-in-1! A light band of lube should be applied to the torsion spring coils. If the door can be operated smoothly by hand, then adjust the closing force switch 1/4 turn at a time. This is a safety device do not use it to overcome another problem!

Aug 15, 2014 | liftmaster Garage Door 1/2 Hp

1 Answer

I have a Liftmaster Garage door model 3280 and I changed the belt and when I try to open the door it only open about 2 feet from the floor.


Remove the belt and then run the opener until the sprocket on top of the motor runs in the counterclockwise direction and stops. Now with the door in the open position replace the belt. Some adjustments of the up and down limits will be necessary.

Sep 24, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Liftmaster Professional 3280 Opener and the lights on the unit don't work. I've changed the bulbs and they still won't stay on when the door opener is activated. If I turn the bulbs slightly they...


Disconnect power to the opener! Then, with a dental tool or small screwdriver scrape off any corrosion etc from the contact in the center of the socket. Also note if it is lying flat against the bottom of the socket. If so, gently lift the center so it has some spring retention and rises up off the flat bottom of the socket.

Aug 17, 2017 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I'm having almost the same exact problem w/ Liftmaster 3280


There is a small glass eye sensor on the garage lifter similar to your TV ( infra red) if this has become dirty with dust etc it will not always receive the signal.Check the manual to see a diagram and trouble shoot page.


Aug 14, 2009 | liftmaster Chamberlain Garage Door Opener...

2 Answers

My garage door opener stoped working after a storm.


there is a 2amp fuse inside the opener. go get one and replace it. please look at what kind of fuse it is it's the one that has glass all around and about 1 inch long. to replace this unplug the unit then take the 4 screws out take cover off and you will see the fuse inside

Mar 10, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

The liftmaster garage door opener issues


If you have a Chraftsman/Liftmaster:
1.Check to see if the door is running correctly.
  A. Run the door down and pull the emergency release. See if the door will run easily by itself.
  1. If it runs hard by hand try lubricating the rollers and hinges with silicone spray or some form of lubricant (not WD 40)
  2. If the door is heavy and falls back to the ground, you probably have a spring issue (either broken or needs more tension) in this case call a professional door repair company in your area.
2. If the door runs fine your gears might br out of your opreator. Open the case and look for a white powder. If you see that and your gaers look worn repace the gaers with 41c4220a gear kit.

Jan 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

1/2 hp craftsman garage door opener won't open when cold


I called Sears garage door customer service number due to the same issue. The test is to disengage the opener drive by pulling the emergency disengage handle, then open the door half way manually and then let it go. If it stays there it is a door/track/lub problem; if it drops down and closes its a garage door opener problem. Mine stayed open half way during this test so it was a door/track/lub problem. After using silicone spray on all tracks, rollers, and springs mine has been working great. Good luck.........

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

1 Answer

Garage Door opens by itself


Your garage door springs may be out of balance. Try this test: Remove power from the opener motor. Pull the red release rope so that the door is detached from the openers drive. Lift open the door by hand- it should open all the way freely. Next, pull the door back down, stopping it about chest-high. It should remain where you stopped it. IIf the door is difficult to move, or does not stay half open, the springs need replacement or adjustment.

Aug 05, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

LiftMaster Gargage door opener problem


The door obstacle detector(reversing switch) needs adjustment, or the down limit sensor needs adjusting, or one of the lift springs is loose or broken. First, remove power from the opener, pull the red door release rope, and try to lift the door up manually. You should be able to lift it all the way open with litle effort. If it opens ok, pull the door down about halfway and let go. If it is properly balanced, it should stay where you left it. If the door fails either one of these tests, it needs spring replacement or adjustment. If the door moves ok, refer to your owners manual on how to adjust the reversing switch, linit switches, and photocell sensors at the door bottom.

Jul 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

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