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

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Excessive opening force detected (code 42)

Garage opener opens a little and then it closes very slowly. The bar that holds the machine bends as it tries to open. An error comes up on the keypad, saying excessive opening force detected. I need to open it at least manuelly for now to get my car out

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Un hook the door from the rail manualy open door to see if it hangs up. if it does fix the door rollers or rail. if not find out what is binding. you may need to adjust the distance it stops

I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102

Posted on Nov 21, 2013

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Your issue with the door sounds like the spring has broke that counter balances the weight of the door, it may take two people to raise the door open once you disconnect it from the opener.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mike_a0891ab86974ea74

Posted on Apr 17, 2014

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Posted on Jan 02, 2017

lobsterman72
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SOURCE: Door will only close when held down

That normally happens when the sensors aren't aligned. Both sensors have led lights on them the yellow/orange one will stay on all the time the green one will go out if it cant see the other sensor. Possibly theres a wire that's broken or the other sensor is really out of alignment. Check every inch of wiring from the sensor to the opener, remove wire nuts if present and check the connections. The wires that are used are small, solid and can break easily. Also see if there's a staple that's too tight, move the wire abit where it's stapled and look for damage.

Posted on Jun 27, 2008

  • 1 Answer

SOURCE: Sears garage door keypad/remote programming problem

Hi All,

I had the same issue recently and here's what I found out (through a LOT of research) and the solution (yes, there is one!):

As described by many, when you can't get both the remote and the wireless pad to work together it means your garage door opener can accept both rolling code and billing code technology, BUT not at the same time. When you reset all codes (normally by pressing a button on the opener for a period of time e.g. 6 seconds or more), you erase all codes and remote "pairings". Then when you follow the manufacturer's procedure to pair again (which could be the wireless key pad first OR the remote first), the first pairing determines the technology for all subsequent pairings. Example: if your first pairing/programming was with the wireless keypad, and if it was rolling code technology (normally the case for newer models), then the garage opener will only recognize and accept rolling code for subsequent pairings. If your remote(s) are older (billion code technology) then the opener won't even recognize the signal (e.g. led won't blink when trying to pair/program).

And vice versa if you start with your remote after erasing all programming (then your keyless pad won't work).

But here is a potential workaround! For newer wireless keypads (e.g. clicker from chamberlain), you have an option to select the type of opener you are using as you do the initial password set up (normally indicated by a number e.g. 1 for models built after 1995, 2 for models built between 1997 and 2004, etc). Each choice is associated with a technology in the background (e.g. either rolling code or billion code). If you are programming your wireless keypad first after erasing all codes / programming, if you chose the "recommended" option for garage opener, chances are it will be rolling code and that means you won't be able to program your older remotes (billion code) after that. So how can you chose the option that will match your remote???

Here's what you do: start by pairing / programming your older remote first after erasing all codes / programs. That sets the technology (e.g. billion code). Then, go ahead and program your wireless keypad, but you may have to go through the process several times by trying the different options until you find one that works!

For me, I had to try 4 options before making it work. Options 1 through 3 (mind you, options #2 was the exact match for my garage door opener model but it would cause the problem discussed here e.g. wireless keypad would work but not the remotes) would not even be recognized by the opener in this procedure (LED would not blink), but it did work once I hit option 4.

I hope this will help you with your problem. Let me know if it's not clear. Cheers!

Posted on Apr 15, 2009

  • 244 Answers

SOURCE: keypad garage door opener will not operate

what keypad are you using with new opener? Frequency has changed. can't use old one. you probably never needed to change things; just needed to follow proper coding procedures.

Posted on Jan 28, 2009

  • 3197 Answers

SOURCE: Liftmaster wireless keypad closes but won't open the door

If you are sure the battery is good you have a bad keypad. The signal strength is so weak it will not penetrate the door.

Posted on Aug 25, 2009

  • 3197 Answers

SOURCE: Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+: Can I bypass the sensors on my garage door opener?...

You cannot bypass the sensors but you can try reversing their position so that the sun isn't hitting the receiving unit. You can also move them back from the door or use something like the tube inside a roll of toilet tissue to shade the lens.

Posted on May 20, 2010

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For the lights, very common the contacts get flattened out and melted. I see this every day. Unplug the opener and let it sit for about 30 min. I never wait but just to be safe, let the capacitor loose its charge. With a precision flathead screwdriver or fingernail, bend the contacts in the light socket out about 1/8". Should help. Buzzing concerns me a little. May be an electrical issue. These openers use an AC brushed motor. They get very hot and in rare cases can catch fire. Theres gear grease and dust inside that has ignited in a few motors. There is an overheat switch built in but dont count on it. I would suggest buying a new machine. Find a DC motor with a belt drive. They last the longest and require the least maintenance. Marantec make the best in my opinion.

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Can open my garage door with the remote just fine, but it will not close the door. When I try to close it from the button inside the garage I have to hold it down until the door is all the way closed,...


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The motor runs but it only opens a few inches and slowly goes back down its a chamberlain whisper drive model HD900D


Hi. I have seen this before, although usually not from chamberlain garage door openers.

Pull the release cord that unlocks the door from the opener, and manually open the door ALL the way open.

Then lock back in place in the open position.

Then use automatic opener to shut door.

It will close very slowly, but should close all the way.

Then, open the door again using the remote, and the door will once again open slowly, this time it should open all the way.

Then close door with remote, and door should now close as it is supposed, with the proper speed.

The slow opening and shutting is the system position sensor resetting itself.

This is why your door is acting up.

I would also look up by the belt drive connects to the front of the garage door opening, to make sure there isn't any dirt, cobwebs, or other obstructions on the sensor that may cause it to re-close the way it does.

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I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...


I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.



The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.

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If the bar is bending when the door closes all the way you need to adjust the 'down limit' on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover until the door stops as it should. You also may have a door sensor problem. Make sure the sensors are pointed at one another and the small light on each one is lit and not blinking.

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Good Luck

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