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

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Garage door open and close fine but the light do not come on

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Unplug the unit from the power and using a screwdriver pull out on the center contact in the light socket.

Posted on Jul 13, 2009

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Posted on Jan 02, 2017

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1 Answer

Why would a Craftsman model 139.53985DM garage door opener not open when it is cold outside?


Safety light issue. Blocked beam. Misaligned beam. Or broken wire.

Mar 03, 2015 | Building Materials

2 Answers

The light on the Garage door blinks but doesn't stay on.


Three blinking lights & door won't close by Candi
(Winston-Salem, NC)
Garage door will not open and close with remotes. Three blinking lights occur when we try to close door. What does this mean? It is a Linear unit.
I will assume you mean that your garage door will open with your remote but will not close. It should close if you press and hold the wall control button until the door is fully closed.
If that is the case, the 3 blinking lights indicate that your garage door's infrared safety beams are not properly aligned.
1) Check that the operator has power. The green lights on the sender and receiver should be lit.
2) If the receiver's green light is on, but the red light is off, the receiver has power but is not detecting the infrared beam from the sender. The red light might flash when the beam is partially detected. This can be caused by
mis-alignment or something blocking the beam.
Adjust the safety beam sender and receiver while watching the receiver's red light (stay out of the beam while aligning it). When the red light stays on, the beam is aligned and your garage door should operate normally.
http://www.linearcorp.com/pdf/manuals/LCO75.pdf
NOTE: If the receiver's red light remains off, check for:
1) Dirt on the receiver's lens,
2) Sunlight shining into the receiver's lens,
3) A short in the safety beam wiring (from staples or at the operator terminals).

Dec 02, 2013 | liftmaster Garage Door 1/2 Hp

1 Answer

My garage door opens fine, just wont close with remotes. Lights just flash. I have to use the opener in garage and keep the button pressed in till the door is fully closed or it will reverse.


Clean both safety sensors lens located at the bottom of the garage door frame. Make sure both sensors led lights are lit. If not they are out of alignment and you will have to loosen the wing nut on the sensor that is lit and move it, trying to get the other sensor to light.

Jul 27, 2011 | liftmaster Garage Door 1/2 Hp

1 Answer

Can open my garage door with the remote just fine, but it will not close the door. When I try to close it from the button inside the garage I have to hold it down until the door is all the way closed,...


Check your door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering ever so slightly. Tweak them a little. If you cannot get both lights to come on you have bad sensors.

Jun 27, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door will not close. I have a Craftsman 3/4 hp chain drive opener on a double door (7x16). The door will open fine. It will not close the door and acts as if the security beam gets broken. It...


Check your door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have bad sensors.

Feb 08, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The sensor lights are steady. The opener cycles fine withouit the garage door connected. Everything worked fine until yesterday. I hit the open remote and the garage door did not open. I hit close and it...


Remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor. Also check the door springs. One of them could be broken.

May 31, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman # 139.53879 -1/2 h.p. Door opener- problem re-programing remote unit. Garage door will open but not close using remote. Wall switch works fine to open & close.


Check your door sensors. They must be pointed directly at one another and the small light on each one must be lit and not flickering. If by tweaking them you can't get both lights to come on you may have a wiring problem or one of the sensors has quit working.

Apr 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener won't close. travels 6-8 in.,


If you cannot get the light on the sensor to come on by tweaking it,making sure it is pointed at the other sensor and your wiring is not broken or shorted then your sensors need to be replaced.

Jan 08, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Liftmaster pro 1/2 hp wont shut in one button press


You have a door sensor problem. Either your main light bulb is burned out or you don't have one in your opener. The clicking sound you hear is the relay for the light. Both of the door sensors should have a small light that is lit. Tweak them until they are.

Jun 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

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