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

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.

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

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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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If you purchase additional transmitters, the garage door
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code.
Program the Receiver to Match Additional Transmitter
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2. While holding the remote button, press and hold the
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Check to see if your child/animal security beam is working correctly. It is an "Electric Eye" mounted about 12 in off of the floor on two mounting points and one side shoots an infra red beam across to a receiver. These points must be reasonably aligned to flash a beam (cannot see) from one point to another. This beam keeps the door open if it is interrupted . If it is not aligned, then the door opener sees a problem and will not close the door electrically. You must aligned the beam by bending the transmitter or receiver untill you can close the door by the remote. Also check to see if something placed in the garage is not blocking the beam first.

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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 sensor is working right, that leaves the downward force sensor tripping. First check for track obstrucions by manually moving the door with the lift disengaged. If door works without excessive force, then increase the force sensor of the lift a bit.

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There are ususally two adjustments on garage door openers...
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On a cold day things are a little tighter and it "wants" a little more downwards pressure to complete its cycle. Sorta like me in the morning -- I need a little coffee to get going on a cold morning.

Adjust the down pressure/force just enough to make the unit close properly. Do not over adjust the down pressure or you will find it won't stay closed. Sometimes the manufacturer doesn't make it too clear where this adjustment is, but you should be able to find it if you look around.

I have seen units that were installed for years all of a sudden need a little tweak of this adjustment.

Good luck

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increase down force, especially if you are in a cold climate. turn to increase down force a little. test door to see if it reverses upon hitting something w/o too much force.

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find force adjustment on logic board and turn clockwise A LITTLE to increase down force. Try to stop door. You do not want TOO MUCH FORCE as that is a SAFETY HAZARD.

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