Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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Chamberlain door will not close, despite down force set to max

My Chamberlain 1/2 h.p. (model 6200) will not travel down more than 1 foot.
The down force setting is set to max. It's not triggering the down travel contact. and the door moves easily and smoothly when I operate the door manually.
The safety sensors are not blocked and indicator lights on each sensor are continuously illuminated, meaning proper operation.
Is something in the electronic board broken? Any ideas on this would be helpful.
Thanks, Dale

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  • 2 more comments 
  • Anonymous Nov 24, 2008

    Same problem, door not closing. I did replace the rpm sensor. What else can I do??

  • Anonymous Dec 10, 2008

    my door will only close about 1foot and then opens again?

  • tdelsart Dec 22, 2008

    same problem. only goes down 1 foot.

  • Mike Rice Mar 17, 2009

    After unlatching door from traveler and determining there wasn't a problem with the door itself, I'm stumped.

    Now I can only close door from inside and with button pushed the entire time until fully door is closed.

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Problem solved, sort of-
My unit has self diagnostic capabilities: next to the remote sync red button, is a yellow light the indicates diagnostic readings by blinking. In my case the light was flashing 5 times after the door failed to close. This meant RPM sensor failure. I rechecked the sensor and "flywheel" cap and found that it was not completely secured. With the "flywheel" in the proper position, providing readings for the RPM sensor, the door completely closed.
But my yellow diagnostic light is still flashing 5 times. My door is operating correctly, but the diagnostic feedback is still not completely happy with my RPM sensor. So I will keep and eye on it.

Posted on Oct 15, 2008

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Posted on Jan 02, 2017

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I think the adjustment mode is on.

For example, that's from Craftsman manual:

""
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""

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