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

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Garage light turns on without disturbance.

Garage light turns on intermitantly turns on with no disturbances while closed and stays on. HELP! (liftmaster belt driven model) stays on all night.

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Hello,
Most likely the unit has a sensor that activates the light when you walk around or open the door.
if no one is in the room it should go off in 5 minutes, but if someone goes back in there to check it goes back on again.

Under the light cover there should be a switch where you can disable it or make it less sensitive.

Posted on Sep 23, 2008

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Door closes then opens by itself


It sounds like the down sensitivity is set too weak. Try adjusting it a little bit stronger on the down setting.

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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

3 Answers

Garage door light 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).
http://www.linearcorp.com/pdf/manuals/LCO75.pdf

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

1 Answer

Gene garage door openers


are you sure that it doesn't just stay on for 30 seconds to one minute and then shut off? if it stays on all the time, the light switch has been manually turned on and you need to turn it onto 'automatic'

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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.

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http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

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