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

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My Chamberlain 1/2 HP garage opener moves slightly down and then just humms. It will then reverse to bring the door up. I have checked and the sensors or not blocked or misaligned. The door opens and closes in manual mode easily. If I ''assist'' the door to shut or open automatically it will work. Any suggestions what I should try?

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DOES THE LIGHT FLASH AND MAKE A CLICKING SOUND??
YOU DIDN'T MENTION IT BUT IF IT DOES THE PROBLEM IS LIKELY IN THE SAFETY EYES.


YOU COULD HAVE A BAD GEAR KIT OR SIMPLY A SENSITIVITY ADJUSTMENT THAT IS OFF.

TRY INCREASING THE DOWN SENSITIVITY ABOUT 1/8 TURN.

IF THIS DOESN'T HELP UNPLUG THE UNIT AND TAKE OF THE COVER IS YOU FIND WHITE PLASTIC POWDER THE GEARS ARE STRIPPED AND A GEAR KIT IS NEEDED.

Posted on May 27, 2010

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Posted on Jan 02, 2017

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Hi. My garage door opener is having a problem closing. It goes about 1/2 way down then reverses to the open position. Its a chamberlain 1/2 hp heavy duty. Any suggestions?


Hi swilson.... on the motor you will find adjustment screws. One to adjust the up setting and one the down. Also one for the pressure setting. Usually when the door is behaving as yours is the pressure setting needs to be tightened a bit so that it does not reverse direction with the tiniest bit of resistence. Make small adjustments so that you do not end up with a door that is a safety hazard in that it will not reverse when it hits an obstacle. Joe

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YOU WANT TO TURN IT COUNTER CLOCKWISE TO THE STOP (THIS ADJUSTMENT IS ONLY ABOUT 3/4 TURN FROM MIN. TO MAX.). THEN TRY THE DOOR IF IT REVERSES TURN IT ABOUT 1/16TH TURN CLOCKWISE. CONTINUE THIS VERY MINOR INCRAMENT ADJUSTMENT UNTIL THE DOOR CLOSES WITHOUT REVERSING. THEN GO 1/16TH TURN FURTHER.

YOU SHOULD BE ABLE TO STOP THE DOOR AND REVERSE IT BY GRABBING THE BOTTOM OF THE DOOR AS IT GOES DOWN AND LIFTING SLIGHTLY. IF YOU CAN'T GET THE DOOR TO BOTH CLOSE AND REVERSE WITH MODERATE PRESSURE YOU MAY NEED ADJUSTMENT TO THE DOOR / SPRING / ETC.
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DOES IT REVERSE OR STOPS BUT NOT TOUCHING THE FLOOR?

IF IT DOESN'T TOUCH THE FLOOR YOU EITHER NEED TO ADJUST THE DOWN TRAVEL OR LENGTHEN THE CONNECTING ARM.

IF IT REVERSES YOU NEED TO DETERMINE IF IT IS THE SENSITIVITY OR THE SAFETY EYES.

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check the infared sensors make sure those are working right. Yo may have to adjust the tension for bring down the door.usually a screw on the motor to adjust the senisitivity.

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1 Answer

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goto http://www.garagedooropenerguide.com/installationmanuals.html

download the pdf for the unit that is closest to what you have, go thru the diagnostics.

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The are two knobs on the back of the opener. They are force settings. One is the upforce and the other is downforce. Turn both knobs to "5" and try. This should take care of the problem. They come from the factory at 1 or 2 and when it gets cold it takes a little more force to cloce the door.

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try adjusted the sensor controls on the sode of the unit other wise replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

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