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

1 Answer

Door will go down only if i keep button pressed

Door will only go down if i hold the button

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  • duns2 Mar 03, 2008

    I noticed that on one of my sensors on the garage door rail, one sensor light is yellow and the otherside is green. I can only close the garage when I hold the button down until the garage is fully down. The remote opens the door and the button when pressed opens the door also. Smart button blinks 2 times than pauses and blinks 4 times, pauses and blinks 2 and than 4 again. What does that code mean?

  • valentino28 Apr 21, 2008

    I have the same problem...
    The yellow light would not turn green no matter how I align it!


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  • Expert
  • 91 Answers

This is what we call in the buisness a constant hold down , that means that the sensors are not aligned , be careful when checking theese sensors because even the slightest flicker will send a false signal to the opener and not allow it to come down , I have installed over 27 thousand ..yes thousand machines to date and i,ve seen it all also make shure the sensor lenses are free of dirt or cobwebs , so now you need to check theese things and also if you realign the sensor and you only have to do one ! make shure you have a steady solid light, is their is a short in the wire ,you should splice a new wire in its place black to black and white to white as they are color coded universaly, also check for brooms and shovels and the typical junk that people usually put in the corners of the garage ,i,ve had many service calls and just had to move a broom that was in the way of the sensor , the beam must be unobstructed and the lights should be bright and solid without any flicker , also green light is the sending unit and the yellow light means it,s the recieving unit on your sensors , Hope you have luck and i was able to help you ,thanks so much for the questionSincerely glenn

Posted on Mar 04, 2009

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The owner's manual will tell you step by step how to program it. Normally you would follow these steps (with the engine off):
1. Press and hold down the two outsid buttons releasing only when the indicator light begins to flash.
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    HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
    WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

    ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
    ARE THE EYES WIRED CORRECTLY?
    ARE THEY AIMED AT EACH OTHER?

    YOU CAN GET THE FULL INSTRUCTIONS AT LIFTMASTER.COM
    THE MODEL # WILL BE DIFFERENT BUT THE INSTRUCTIONS ARE THE SAME LOOK AT THE MANUAL FOR MODEL 3280

    HOPE THIS HELPS

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