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

1 Answer

Sears Craftsman 1/2 HP 139.53985

Our opener has been working intermittingly for awhile. Noticed that the green sensor light was not on and would not come on no matter how much adjusting on the receiving eye. Bought new sensors and installed - both lights are on as should be now. Upon replacement and aligning, opener seemed to be working properly. Went out a few hours later and it went back to not working again - power is just completely off to the whole system. We did some more adjusting , went back out a little bit later and the power was back again. Any ideas on what our problem is?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 91 Answers

Check the wiring. when you installed the new sensors did you run all new wire? Sometimes during an installation the installer staples the wires to the wall then across the cieling to the opener. Sometimes the stapler will pierce the wires or be too tight and over time a short will occur. If all the wires are exposed (you can see them) slide them abit and see if theres a really tight one. (Helpfull if you have an assistant stare at the sensors to see if something happens). If thier buried in the wall then run new wires. Sometimes the drywallers will hit a wire with a screw when thier doing thier job.

Posted on Jun 27, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My craftsman 1/2 hp garage dood does not close when it's cold out (with either a push on the remote or a single push from the wall). I have to hold the wall button in until it's completely down. When I do...


Make sure the brackets for the sensors are tight and the small light on the sensors is not blinking ever so slightly. You also might try shading the sensor so that the sun is not shining directly into the lens.

May 20, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: My craftsman 1/2 hp garage dood does not close whe...


If the main light flashes 10 times when you try to close the door it is a sensor problem. Make sure they are not flickering ever so slightly and that they are not loose on their brackets. Tweak them a little bit.

May 18, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Sears Craftsman 1/2 hp chain garage door. The light blinks at the garage; will open the door but the remotes do not work. Can you help?


I have worked on a few garage door operners. Sometimes the solder breaks where the metal maked contact. Could have it checked or may need a replacement from Sears.

Oct 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How do we reset our Craftsman 1/2 HP Part# 41A4315 - 7A garage door opener? When you press the button is goes down a little ways and then back up. The little green sensor lights will not come on either,...


If the lights in the door sensors do not light you have either a bad logic board or bad wiring to the sensors. Replacing the logic board is usually the cure.

Jun 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

1/2 HP Sears Liftmaster will not close


YOU PROBABLY HAVE A BROKEN WIRE ON THE SENDING EYE. THIS WOULD CAUSE IT NOT TO LIGHT AND THE RECIEVER NOT TO GET A SIGNAL MAKING IT NOT LIGHT.

YOUR DOG IS PROBABLY THE CULPRIT AGAIN . THEY TEND TO SNIFF AROUND OR JUST GENERALLY BUMP INTO THE WIRES (SOMETIMES THEY CHEW THEM).

IF NO OBVIOUS BROKEN WIRES OR LOOSE CONNECTIONS CAN BE FOUND. YOU CAN TEST THE WIRING BY USING DOOR BELL WIRE TO TEMPORARILY REPLACE IT - THE FAULT COULD BE INSIDE THE WALL OR UNDER A STAPLE WHERE THE WIRES GET SMASHED (THIS ONE WE CAN'T BLAME ON THE DOG) :)

IF YOU REWIRE COMPLETELY (PAY ATTENTION TO THE POLARITY OR THE TEST WILL NOT BE VALID) AND THE LEDS STILL ARE NOT ON YOU COULD HAVE A DEFECTIVE EYE

Mar 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door Opener Intermittingly Reversing


try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Dec 24, 2007 | Sears Craftsman LiftMaster Chamberlain...

Not finding what you are looking for?
Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo

390 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sears Garage Doors Experts

Al Clark

Level 2 Expert

290 Answers

Cindy Wells

Level 3 Expert

4754 Answers

Pieter Vleeshouwers

Level 3 Expert

1410 Answers

Are you a Sears Garage Door Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...