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

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Chamberlain 240 1/3 hp garage door opener, shorted out

When attempting to change the door opener light I must have touched the opener casing with the bulb wire. The opener now does not work and nor does the outlet into which it was connected. None of our breakers flipped off though. We connected the opener to a known working outlet, but still no luck... And yes we tried the remote but still no activity. Whatever happens we will need to find the opener's breaker too. The panel isn't labelled fully, and as we are recent occupiers of the house we don't have a clue which is the opener's breaker switch. No mention of a fuse in the opener within its manual.

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  • jimmybollock
    jimmybollock Jan 12, 2013

    No breaker tripped. Inside door button is not lit. Pressing the button for any length of time has no effect.

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Posted on Jan 02, 2017

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SOURCE: garage door remote

It sounds like the lock function has been toggled on. Press and hold the button on the wall control with the lock icon for 3 seconds. This will toggle that function off.

Posted on Jun 08, 2009

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SOURCE: lights on overhead unit on garage door opener will not go off

This is not too uncommon. What tripped the breaker in your house also got to one of the relays on the logic board of your opener. The only cure I know of is a new logic board.

Posted on Jun 18, 2009

  • 476 Answers

SOURCE: Neighbor opening our garage door

Report this problem to the Manufactuer stating your model number of controller and remotes too and they may help solve your problem faster than getting offside with your neighbour,apart from that the remotes and motor controller may need replacing to give you more security and control over your own secure enviroment,

I have fitted many security devices,alarm panels,cameras,sensors,keypads,etc,
and never had to repair this type of fault as the supplier or manufactuer has always assisted with their products thru warantee or advice,

I have 20 years of experience in the industy in NZ,Thanks MISTERDJ

Posted on Sep 04, 2009

  • 3197 Answers

SOURCE: unabler to program a chamberlain garage door opener

If you are absolutely sure you got the correct remotes for your opener then you have a bad logic board.

Posted on Dec 31, 2009

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1 Answer

Back doors on car locked cant open


I think you have a short circuit in "that headlight wire" that is causing the fuse to keep blowing due to a dead short.
Maybe a positive voltage wire that is touching the ground (metal part) on you car or touching some other connection.

Hope this helps.

Regards.

Dec 19, 2017 | Cars & Trucks

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Microwave will not run a cook cycle. Touchpad functions until door is opened or start button is pressed. When door is opened display goes dark. When door shuts display lights all characters and then says...


BEFORE DOING ANYTHING DISCONNECT OVEN FROM POWER. I do NOT recommend doing repair by yourself, if you NOT are really very familiar with electric repair, or have at least basic training in electric device repair and maintenance.
"When door is opened display goes dark. When door shuts display lights all characters and then says "touch clock"."
Obviously, by opening door, oven gets disconnected form power line.
This is mostly caused by loose connections on wiring socket, and can be anywhere inside. Check security micro switch on door latch. This switch normally disables only running the oven when door is open, for security reasons. In your case, it seems that opening door disconnects oven from input power. Sometimes the switch is loose, or wires are not firmly pushed in the socket. If the power line wiring is loose, and by opening door looses contact with socket, it can touch metal housing inside, cause short, electric shock, serious even mortal injury and fire. This is dangerous high voltage switch, and to access it one must open oven from the back and take off the cover. I do not recommend doing it by your self.
Rem: Replacement micro switch is couple dollars.

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2 Answers

Sears garage door opener wall switch works properly (I do NOT have to hold button in to close door), remotes don't work. Sensors are solid green and door reverses when beam is broken when activate


If you recently changed the light bulb in the unit, try changing it back to a basic clear bulb. I just had the same problem, and after research, found that changing bulb to a new type LED bulb messed up the remotes. A good test, is to try the remotes when the garage door light is "OFF". My remotes worked as long as the light was "OFF". I changed the bulb back to basic bulb, and everything works fine!!

Mar 22, 2013 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a maytag gas dryer mgdx500xw, with door open and light on, circuit breaker blows, with door closed it does not, if I remove the bulb, it won't blow either way. Weird?


the return neutral wire from the bulb has to have a bare spot on it touching the metallic case somewhere in the dryer,when you remove the bulb you just isolate the bare spot on the neutral wire from the hot wire

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Hi I have a MkIV Golf TDI and i'm having a few electical problems. Whenever I am driving along every couple of minutes the hazard lights blink on/off. Also my drivers side dipping beam doesn't work at all...


It's probably damaged/broken wires or possibly if someone put a bigger fuse in it then was meant to be in it, then the wires may have gotten so hot that the casings melt and the wires are then touching.

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Chamberlain 102-1499A Opens w/ remote. Will not close w/remote.


If when you try to close the door the main light flashes 10 times and the door reverses to the open position you have a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have a bad sensor.

Jul 23, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster Chamberlain Garage Door Opener Transmitter 300MC: Light keeps on flashing on the motor...


how many flashes
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2-safety senor wire shorted or reversed
3-door control or wire short
4-safety sensors mis aligned
5-motor overheated or bad RPM sensor
6-circut failure, bad logic board

May 17, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Door would not close all the way


DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

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