Question about Chamberlain 1/2-HP Whisper Drive Belt Drive Garage Access System

1 Answer

Door wont close

When I hit remote, door tries to close. I hear the motor actuate and can visibly see the door "****" but chain drive seems to be stuck in place. Door move manually without a problem and in going over the chain, it seems fine. Is the problem internal?

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  • Chamberlain Master
  • 12,962 Answers

The gear wheel powering the chain is stripped. The cogs are usually plastic and not uncommon for them to wear or break off. Replaceable item from manufacturer.

Posted on Nov 28, 2013


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Posted on Jan 02, 2017

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SOURCE: Hi there. I have a Chamberlain Whisper Drive

I just had that problem this morning and the cause was that the springs that help hold the weight of the garage door were broken. This caused the garage door opener to raise the garage door a fe inches and then drop again. We called in a professional and $200 later we had new springs and everything works fine now.

Posted on Dec 17, 2009

  • 143 Answers

SOURCE: Chamberlain hd900d garage door opener

You will have to open the unit and look inside it. Unplug it first. It should have 6-8 screws to take off. You will see 3 white plastic adjustment screws. There is a carriage they sit in. Make sure they are in this carriage. If you would like stay back a bit and plug it in and watch it run to see how it works. It is a direct contact system, so when the middle screw touches the copper limit of the limit screw it stops. Thanks BB

Posted on Oct 11, 2010

  • 15 Answers

SOURCE: My door will not go

It is safety "eyes" sensor issue with your system. Lights flashing on the main console indicate a potential problem. Model up, from yours WD962KD, I believe, has a "smart" wall mountable remote that displays a potential problem. In your case, I would check that both safety "eyes" sensors are working (both should have lights on, one amber and one green). Post if you need more help.

Posted on Nov 01, 2010

  • 15 Answers

SOURCE: The opener seems to want to continue closing the

Try to re-program travel and force limits. Make sure that travel limit (down) does not go too far (thus excessive force). Apparently this system has a force sensor that senses if there is something in the way of the door. This is different from the safety sensor "eyes". The problem in your setup is that you have programmed the door to travel down too much and he system looses its ability to use force sensor. Adjust travel limit (down) to a little less travel and you will be fine.

Posted on Nov 01, 2010

  • 128 Answers

SOURCE: Chamberlain Power Drive / Whisper

It sounds like the door is your problem.
Check the counter balance spring above the door. It is likely broken.
If the door cannot be operated manually, the garage door opener will not open it either. The machine is made to operate a door that works correctly. If the door is broken, the machine will not work either.
It also sounds like the opener gears may be worn out. That also occurs because the door required service.

Posted on Jan 03, 2011

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The reason your door is opening again is because there is a limit switch that is not making contact at the appropriate time to tell the drive to stop closing the door. The chain drive motor is controlled by a circuit that is expecting to see a signal telling it that the door is closed. If it doesn't see this signal to stop at the appropriate time, it continues to drive the door down unless it sees a certain amount of back pressure, which then tells it to return the door to the up/open position. This is a built in safety feature for most garage door drives and is industry standard now due to children getting caught under them and being killed. You can try this yourself. Stick a 4 foot 2x4 vertically under the middle bottom of the door as it's coming down, after a second or two the door will reverse direction.

With the chain falling off the drive and loosening it to replace it, you may have inadvertantly positioned the actuator of the switch, which is usually attached to the chain, out of position by a couple of links. There is a momentary contact switch mounted close to the door on the support shaft of the drive mechanism. This support shaft is the one holding the motor drive on one end, along with the chain and is anchored to the header over the garage door. This momentary switch may have a short metalic or plastic arm hanging down that is moved by the actuator on the chain and needs to be reset to a position where the switch contact will be closed when the door is in it's closed position. There are other options also depending on how new/old your door drive is. Some of the newer models use a through beam sensor or photo eye as a stop switch.

Please let me know if this helps.


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