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

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Garage door doesn't open or close

Once again my wife left this morning and the garage door would not close. It's a Liftmaster 1/2 HP Security Plus chain driven opener. The motor hums but nothing happens. The chain doesn't move or the stocket on top of the motor doesn't move either. Any suggestions?

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You should check the gears inside the box, After years , the gears get dry and die, you can by online or from Sears the kit and replace the old gears. I just changed mine...not too difficult :) .

Posted on Mar 26, 2009

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Garage door won't close...when putting in the 4 digit code the door closes about 6-8 inches and then opens up again


COULD BE THE SAFETY EYES OR THE RPM SENSOR.

IF HOLDING DOWN THE WALL BUTTON ALLOWS IT TO CLOSE NORMALLY THEN IT WOULD BE IN THE SAFETY EYES.
IF NOT CHECK TO SEE IF THE RPM SENSOR IS IN THE CORRECT POSITION ON THE MOTOR SHAFT.
IF YOU NEED FURTHER DIAGNOSTICS GOTO LIFTMASTER.COM AND SOWNLOAD A FREE PDF FILE OF THE OWNERS MANUAL.

HOPE THIS HELPS

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IF THE DOOR OPENS WITH YOUR REMOTE BUT DOESN'T CLOSE (AND WORKS NORMALLY FROM THE WALL BUTTON) THE PROBLEM IS IN THE SAFETY EYES - CHECK TO SEE THAT BOTH LED'S ARE LIT.

IF NOT CHECK WIRING POLARITY - CHECK FOR BROKEN WIRES - CHECK FOR ALIGNMENT AGAIN.

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IF YOU CAN GET THE NAILS OUT AND REINSTALL USING 3" WOOD LAGS IT WILL MAKE THE SUPPORT STRONGER AND IS EASIER TO GET IN PLACE THAN TRYING TO DRIVE NAILS IN A TIGHT AREA

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The motor is probably either stalling because the door is too stiff, or you have a beam break detector that is being triggered when the door is halfway down.

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If you have a Craftsman/Liftmaster can you push and hold the wall button to make it go all the way down? If you can than photo eyes are your issue. Check and see if they are both lite.

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