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

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Sensors for GDO need realignment.

How do I realign my sensors for my GDO?

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Quick and cheap way is to use a string and masking tape. The sensor does not have to be exact. If you have a laser level you can use that too. Hope this helps

Posted on Aug 24, 2008

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Craftsman 1/2hp garage door opener works fine to open door but to close I have to hold button down. If not, door won't move and lights flash 10 times.


10 flashes mean sensors are obstructed... something is in the way of the door or they are not facing each other. Clear the obstruction or realign the door and it will work.

Aug 27, 2014 | Craftsman Garage Door Opener 1/2 HP Chain...

1 Answer

How do I get my remote to close the door? It will only open it.


Light sensor at bottom of door may be broken or something in the path of the light or the sensor and light source need to be realigned.
garage door won close YouTube

Aug 25, 2014 | Garage Doors

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One sensor light is out


you probably need to realign your sensors. I hope it works for you.

Mar 02, 2013 | Sears Craftsman LiftMaster Chamberlain...

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How do I realign the sensors?


Both sensors will have their green led lights lit (on) when aligned. When not aligned only one sensor will be lit.

Make sure both sensors' lens are clean.

If still not aligned loosen the lit sensor from its mounting bracket using the proper tool, but most LiftMasters have a wing nut mounting for the sensors.

Aim the free sensor in the direction of the unlit one and look for its led to light. If necessary, using a screw driver remove the staples securing the sensor wiring enough to physically place the sensors eye ball to eye ball looking for the unlit sensor to light. If the unlit sensor still won't light then there is a broken or pinched wires some where between the unlit sensor and the garage door opener.

Jul 22, 2011 | liftmaster Garage Door 1/2 Hp

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The opener won't close. My husband said the sensors need to be realigned. Did that and still the opener halts after 2 inches and flashes the light? It is a six year old Sears Craftsman Chamberlain model?...


If the main light flashes 10 times it is a door sensor problem. If the main light does not flash then you can try increasing the down force. This is a control on the rear of the motor unit near where all those white wires go. If this doesn't help you probably have a bad infra red sensor board. This is a small printed circuit board just in front of the motor.

Apr 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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

Doors open but will not close


Check the laser. Make sure that the safety lasers are properly alligned, If the bottom sensors next to the floor on the door rails sounds like it has been moved and just needs to be realigned. Pretty simple work to take care of the problem unless the sensor is broken

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

1 Answer

Electric garage door opens after closing


ok. now if you have the type of garage that has the sensors that stop it from landing on something they are un-lined sooooo. realign them.

Feb 12, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door


sensor got bumped, realign till both lights show green

Mar 26, 2008 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman GDO Will not close


readjust the sensor controls on the side of the unit

Dec 28, 2007 | Sears Craftsman LiftMaster Chamberlain...

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