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

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Garage door sensor blinks continuously - door wont close

Hi, Just got back from vacation and our dog sitter left the dog in the garage and in trying to get out - he ripped out a sensor. We have the sensor wired up again it blinks constantly. According to the Liftmaster chart on LED codes: Rapid Flashing This is not a problem but just an indication that the opener is receiving a signal but it will not respond to an unauthorized code Chart can be found here: http://www.bearcatco.com/helpgifs/liftmaster_troubleshooting.html How do we fix this? One forum said to unplug the garage door opener for 5 minutes and it will reset. That did not work. It is a Liftmaster garage door opener. Any help is greatly appreciated! Thanks!

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It is getting a signal, but the wrong code. Call the dealer for your garage door and ask for a solution.

Posted on Jul 29, 2013

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Posted on Jan 02, 2017

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SOURCE: Chamberlain Liftmaster Professional 1/2 HP

Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

Posted on Jul 25, 2008

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SOURCE: Liftmaster garage door intermittent power loss

I had the same problem. Although it appeared to be the logic board, on mine it actually was the connectors between the logic board and the power supply board.
There are 2 connections on the logic board. One white connector with wires going to the main unit, and another set of connectors that plug directly into the smaller circuit board that holds the step-down transformer (120vac - 22vac). These pins were not making good connection between the boards. I simply bent the pins slightly so they would make better contact on the logic board and have not had a problem since. This must be a weak point on these door openers. Purchasing a new logic board would work too, as the connectors are newer and tighter.

Posted on Oct 23, 2008

  • 244 Answers

SOURCE: Craftsman Garage Opener Clicks only and LED blinking 5 times

first off, hitting extra button on remote would not do anything. Is door up or down/ where is trolley that attaches to chain, by door or motor. Is is jamned against a bolt. Try a paper clip and jump from white to read terminal. Does it work. Does light bulb blink 10 times. I ignore the diagnostic lights and go by symptons. Give more info.

Posted on Feb 12, 2009

  • 3197 Answers

SOURCE: Code reset button for garage door opener

The button is just to the left of where all those white wires go. You may have to remove a light lens to get to it.

Posted on Jun 08, 2009

  • 3197 Answers

SOURCE: I have LiftMaster garage door model 41A3039 and

To program the keypad, first unplug the garage door opener from the electrical outlet. Next remove the nameplate from the console that the keypad plugs into and locate the program/operate switch. Flip the switch to program. Next enter your desired four-digit PIN number into the keypad. Slide the switch back to operate and plug the garage door opener back in. The keypad should be programmed.

Posted on Jul 13, 2009

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2 Answers

Door wont close


Roger, does lights blink when attempting to close door?? If so it is the photo sensing eyes. Be sure they are not blocked and properly lined.
If all is ok, replace the photo sensors. Hope this helps

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Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. If the transmitting sensor light is blinking it is bad.

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My garage door will not close. The door gets close to the ground, then starts back up again and when it gets to the top the lights flash.


Just got off the phone from one of the rep's of Chamberlain...Go to the sensor that is blinking(it should be the one with the green light) loosen the sensor until the light goes out, then tighten it back up until the light come back on, and push the garage door opener. it should reset the unit.

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Check to make sure the sensor are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have a bad sensor.

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Tweak the sensors to see if you can stop the blinking. They must be pointed at one another and not blinking for them to work properly.

Dec 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

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The code you are seeing with 5 blinks is "RPM sensor or motor overload." We can eliminate the motor overload because the door is trying to close. The RPM sensor is a small printed circuit board just in front of the motor. It's a snap to replace and is available at any good door opener company. They will know exactly what you are talking about if you ask for an RPM sensor board.

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Hold the button with the lock icon in for 3 seconds. This should toggle the unit off vacation mode and your remotes will work.

May 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

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you have problem with sensors. does each have an led lit. if not, align them better, should solve problem.

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Old nutone garage door opener


Hello,

There should be 2 sensors on the bottom of your door on the inside, 1 on the right side and 1 on the left side.
These sensors serve 1 purpose to send a beam or reflection to each other.
If something is blocking this reflection or is in front of the sensor the door will always come back up.
It is a safety feature so nothing or no one gets hurt when the door is closing!

If any thing is blocking these sensors the door will not close! Make sure nothing is in the way not even a peice of paper.

Sep 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Remotes don't work (3)


Did you inadvertantly hit the "vacation lock" button on the Mounted push button? This will cause the remotes not to work. Try hitting the button again, and then see if the blinking goes to solid green.

Good Luck

Jan 01, 2008 | Sears Craftsman LiftMaster Chamberlain...

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