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

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Wiring on a chamberlain 7200 opener

How are the wires on the back supposed to go. when i hook them up the lights blink on the sensor and the swith on the wall. i just installed a new worm gear and have put it back together. please help

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You'll need to go to : http://www.managemyhome.com/mmh/common/Home.action?sid=MMHMxSearsx00020

Go to the middle of the page 'Search Product Manuals'.
Type in your model #, xxx-xxxxxx of the garage door open.
It should give you the correct wiring diagram your looking for.

Posted on Feb 14, 2008

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Posted on Jan 02, 2017

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1 Answer

Chamberlain troubleshooting


Check to see if sensors (eye) on sides of door are lined up, they need to be looking directly at each other. If that doesn't work change sensors, simple, install, hook up 2 wires per sensor, wire with line to same wire, blank wire to same blank wire and align so sensors see each other.

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I'm having to hold the main remote button down continuously to get the door to close. It acts like something is obstructing the path, but it's clear. The sensors have a green light on one and a...


You need to hook those wires back up and then check the door sensors very closely. If the light in one of the door sensors is dim or flashing it will cause your problem.

Sep 12, 2011 | Sears Craftsman LiftMaster Chamberlain...

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I hooked up my sensors to my chamberlain garage door and one light works and the fashing light worked than just quit tried to align but still nothing when i turn power on it clicks on and off same as i...


The small light on each sensor must be lit for them to work. Make sure you wired them correctly. Make sure the wires with the black stripe are hooked to terminal #3.

Aug 13, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Gararge door lights blink door starts down and then returns to open I have replaced sensors at door opening checked wiring and adjusted down pressure


If the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure the lights on the sensors are on and are not blinking or that one is not dimmer than the other. Check that the 2 solid white wires are connected to terminal #2 and the 2 wires with the black tracer are connected to terminal #3.

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

1 Answer

Chamberlain garage door will not close


See if both sensors stay lit until the door reaches the closed position.

If either light is off or flickers the door will go back up. Try aiming the eyes very carefully. If they are aimed properly. Check the wiring if you move the wires and the light flickers you have a bad connection. If the lights don't come on you may have a broken wire.

Mar 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Have a Craftsman Garage door opener - doesn't activate, only the light blinks. Neither sensor has any lights lit. Any suggestions?


If you mean the main light blinks when you try to close the door then you have bad door sensors or the wiring going to them. Make sure the connections are tight and the wire is not broken somewhere.

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

1 Answer

When I push open or close the unit starts but stops the yellow light on rear of unit blinks 4 times then a short pause and blinks 4 times again and continues to do this



# of flashes

1

2

3

4

5

6

Rapid Flashing





Problem

The Protector System wire open or totally misaligned

The Protector System wire shorted or black/white wire reversal

Door Control or Multi-Function control Panel wire shorted

IR sensor slightly misaligned (dim or flashing sensor LED)

Motor overheated/Possible RPM sensor failure -- unplug to reset

Motor circuit failure -- replace RX/LX board

Liftmaster transmitter with the correct format code being received
(opener not necessarily programmed to respond)

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2 Answers

Chamberlain Whisper garage door system that only closes 3/4...


One sensor should always be yellow, the other should be SOLID green.
If the lights are not consistently SOLID, you have a sensor issue.
TEST: If the door closes completely by pressing and holding down the wall pad button, you have a sensor problem.

Check to make sure the are aimed properly at each other.
Check the wire at the sensor and more importantly at the machine (If the wires are loose at the machine (terminals) it can cause this problem. Remember the machine does shake a lot.
If the wires are good, the sensors are aimed correctly, you have a sensor issue and need to loacte a replacement set.

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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.

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