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

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I need to know the order to connect the wires

I need to know the order to connect the wires from the
safety sensors to a craftsman
opener.

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The solid white wire from each sensor goes to terminal #2 and the white wires with the black tracer go to terminal #3.

If the wall control is also connected you should end up with one white/red wire on terminal #1, 3 white wires on terminal #2 and 2 white/black wires on terminal #3.

Posted on Apr 30, 2010

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I save a Sears HBW0777 garage door opener. When I click my remote to open it, it moves for a second then I hear the opener clicking. The same sound when something is in the way of the door. If I hold...


Unhooking the wires disconnected the safety sensors completely. The safety sensors are required to close the door. Both lights should be on, the lenses should be able to see each other clearly, and the wires between the sensors and the opener must be intact, in order for the system to function properly. Reconnect the wires to the opener, adjust the aim of the sensors, ensure there is no debris in the sensor lenses, and if it still doesn't work, you'll need a set of replacement sensors.

Aug 23, 2013 | Sears Craftsman LiftMaster Chamberlain...

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How do you align the safety sensors for a lifmaster garage door


The indicator lights in both sending and receiving eyes with glow steady if wiring and alignment are correct.
http://waterheatertimer.org/pdf/Liftmaster-safety-reversing-system.pdf
Connect the wires together on safety sensor receiver (with green indicator light), so it by-passes safety system.
The safety system consists of sender with amber light, and receiver with green indicator. Receiver must receive light in order to keep switch circuit closed. If receiver receives no light from sender, then switch opens, and garage door will not function.
Connect both wires on receiver will simulate the closed switch, as if receiver is receiving beam of light.
You can order replacement sensors from amazon

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1 Answer

Need help with craftsman 315 opener. this is a new install and the safety sensors are not working properly. even when they are not aligned properly, both the green and amber lites are lit solid,should...


Check to make sure you have them properly connected at the motor. The solid white wire from each sensor goes to terminal 2 and the wires with the black tracer go to terminal 3.

Jan 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Remote control opens garage door but will not close door - craftsman 53990d


Have you checked the sensors? There is an electric eye type sensor- send on one side, receive on the other, usually located knee height or lower. If something is blocking it, or if they have been bumped and are not in line with each other, the door will not close. It is a safety check to keep the door from accidentally crushing anyone or thing that might be under it. On one, there is usually a tiny light that is steady if they are in contact, or it will blink if not. If blinking, just line them up until the light is steady.
There is a little wire attached to them bringing electricity and connecting them to the opener. If the sensors are connecting or are not lit at all, check that this wire is connected to the sensors and the opener.

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Your opener was manufactured before there were safety sensors and there is no way to add them. You would be miles ahead to replace the opener with a new state of the art model.

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

1 Answer

Sensors


I think someone has used wiring that didn't come with the opener. One the rear of the motor unit are wiring terminals. The sensors connect to terminals 2 and 3. Whichever color wire is connected to terminal 2 goes to the screw marked white and the wire on terminal 3 goes to the screw marked black. This information is if you have a Craftsman or Chamberlain opener.

Sep 02, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

One sensor light is blinking green, the other sensor light is bli


the safety eyes are wired wrong on the back of the opener. Check the wire locations.

Nov 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door opens only 6 inches and stuck


I would try jumping a wire across the white & red terminal to see if your safety sensors are working Properly! If your door opens you have a loose connection or faulty sensors.

Oct 22, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door sensors


#2 and 3 on my opener. #1 and 2 are atteched to the wall button. So # 2 has both attached. Hope that helps.

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