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

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Red light/stuck GDO Sears 139.53600

I have a an old Sears 139.53600 GDO. The wall mounted opener (it's hard wired to the unit) shows a red light and neither the wall mount nor the remote will open the door. Its as if the door is locked. Thanks in advance!

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  • jessica_powe Jan 28, 2009

    Door lifts manually. Everything else looks fine accept the red light and the fact that the door won't open with the remote of the wall mounted button

  • jessica_powe Jan 28, 2009

    vheuser1 ,

    No sound. Nothing happens when button is pushed. Its as if the door is locked and a signal isn't getting to the system. Could I have locked the door? Is that what the red light means?

  • jessica_powe Jan 28, 2009

    The wall controller is just one big button. The system is very old (the kind with dip switches in the remote). I don't want to go to the expense of buying another one because we're moving out soon. I just want to leave everything in working order...

  • Vince Heuser May 11, 2010

    Does the opener sound like it is working when you push the button but nothing moves?

  • Anonymous Mar 19, 2014




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Is it locked. does door lift manually. are springs/cables ok?

Posted on Jan 28, 2009

  • marty metzger Jan 28, 2009

    how old is gdo. what does wall control look like. is it brown with two black buttons. does it have a lock or security slide switch?

  • marty metzger Jan 28, 2009

    try taking wall control down and touching the two wires together. what happens? If it works this way, does remote control work. If so , replace wall control with pushbutton. PS=If unit is OLD and you are selling house, you may be asked to replace gdo because of lack of saftey beams. did unit reverse upon hitting obstruction. If not, you will NEED to replace.



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1 Answer

Chamberlain Liftmaster GDO just clicks, no lights no open/close

Pull the logic board and check it for burnt or missing traces on the printed circuit. Thunderstorms love logic boards.

Apr 25, 2010 | Sears Craftsman LiftMaster Chamberlain...

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I have a Craftsman 1/2 HP Garage Door Opener part # 41A4315-7. The D.O.C. cert # is K1027 and the date is 3/93. Several months ago the garage door opener ceased to function. I do not remember the symptoms...

I was not at all pleased with the service provided by FixYa.
I spoke to two different professionals and their responses did NOT help me solve the problem.
Their responses sent me on a time wasting series of steps that were not productive.

Both pros told me the problem was probably with the motor in the Garage Door Opener.
One told me I had to remove and disassemble the motor to read the windings with a multimeter.
I’m glad I didn’t follow his instructions.
Based on two pros telling me it was the motor (which I did not believe) I did a test.
Here was the process for testing the motor:
This is a dangerous process for a person with limited skills.
The test is done with the GDO in place, the cover removed, chain disconnected and power unplugged.
You will need a standard electric appliance power cord with either a two or three prong plug (pigtail).
The other end will be bare wires.
I used a 2 prong cord removed from an old steam iron but any power cord will work.

Remove the white supply wire from the light bulb socket in the GDO.
Attach one lead from the power cord to the white lead and cover all exposed copper wire or connector with insulating electrical tape.
If you are using a 3 prong plug, fold the green ground lead back out of the way and tape it to the power cord.
Make sure the remaining bare wire lead is not touching your body on anything metallic, then plug the power cord into the same socket you would plug the GDO.
Carefully touch the remaining HOT bare wire lead to either the RED or BLUE leads from the capacitor to the motor.
The motor should run.
Mine did just fine …. Nothing wrong with the motor.
I then touched the HOT lead to the other (Red or Blue) capacitor lead and the motor reversed direction …. Perfect.

I don’t know if this is a valid test of the capacitor, but I then touched the bare HOT lead to the Red then the Blue leads INTO the capacitor.
Again the motor ran fine and reversed direction.
I deduced that the capacitor was also working.
There is very little clearance for this last step so do it carefully.

After verifying the motor and capacitor were not the problem I started retracing all other power supply factors.
Ultimately I found I had reversed the bell wire leads from the door safety sensors when I reinstalled the GDO.
I had connected the hot lead from the left sensor to the right sensor input.
This is very easy to do because the two leads are identical.
The GDO will not operate with these leads reversed.
I corrected the connections and the GDO now works perfectly.
This could have been a 10 minute fix if either pro had asked the right question.
I don’t think either pro is aware of this requirement.

When I signed up for the chat the web site indicated I would be charged $12.99.
Now I find I am being charged 19.99 for bad information.
I doubt I will use your service again.

Jim Shane

Dec 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Red service light is on the diehard battery backup of my craftsman garage door opener.

time to change the batterys- they cost $90. and owner can install or a gdo repairer can, but consumer should, its harder to make coffee then replace these batterys.....

Nov 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Sears Craftsman Gar. door opener won't respond

There isn't a fuse. You are going to need to remove the cover on the opener and find out where you are losing the power. Maybe a neighbor has a volt meter you could use. I would check the power cord and then the logic board. Makes no sense but I would check for burnt or missing traces on the printed circuit board especially around that small transformer.

Aug 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Wall mount not opening door. Looks like its not getting power.

You may have disturbed the wiring leading to the wall control. It connects to terminals 1 and 2 on the rear of the motor unit. The wires are color coded and must be connected correctly. The solid white wire goes to terminal 2 and the white wire with red tracing goes to terminal 1.

Jun 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Wireless keypad will close door but will not open

If you are sure the battery is good than it sound like the keypad is bad and needs to be replaced. With a 6+ year old operator I would suggest a wired keyless entry (Donino GD-1) so if the operator has to be replaced you can use the same keyless entry.

Jul 04, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Wiring the opener and sensors

The wall button gets the red and white wire. The safety eyes use the black and white wires. There are two types of attachments on the back of the openers. One has three screws. On this type the 1 is for the red wire, the 2 is for all white wires, and the 3 is for all black wires. The other type has four blocks and you just match the color to the wire color.

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

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