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

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My door keeps coming up after fulling closing. I have tried adjusting the down force through it's full range until it bends the chain bar pushing down to so light it won't close at all. I have also tried backing off the down travel as far as the screw will go from all the way tight, trying every turn, and it still keeps coming up. the opener light does not flash. I have amber and green lights on my safety sensor. they work properly if I break the beam when door is coming down

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Posted on Jan 02, 2017

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SOURCE: Door will only close when held down

if you obstruct the photo eye does the light flash ?

Posted on Jun 15, 2008

  • 91 Answers

SOURCE: Door will only close when held down

The problem is in the sensors at the bottom of the tracks. They both should have lights on them one orange, sending, and green, receiving. In almost all cases theres an indicator on each side to let you know that sensors are positively aligned. Check wiring.
The only other problem I have seen is if the opener has gotten damaged by a power surge or lightning. The safety sensor part of the computer board on the back can get damaged, and maybe a sensor or two but, everything else works ok.

Posted on Sep 02, 2008

  • 1 Answer

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

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

Door Tech
  • 98 Answers

SOURCE: lights dont come on

If you have a Craftsman/Liftmaster with a 3 function wall control:
use the lift button to turn the light off. push and hold the light button for @1min. until the light flashes. This should reset your operator to have the light turn on when you walk through the photo eyes.

Posted on Jan 04, 2009

  • 30 Answers

SOURCE: Chamberlain Garage Door Opener will not close door

It is most likly your sensors You should not have to mess with your force settings but I can help you with your sensors assume you have checked to make sure there both looking at each other. First close the door so you can see them better. Tap each one of the sensors to see if any of the lights are flickering. if your then you need to tight them up and try again. Also when its dusk or night close your garage door and look at the lights see if one of the tracks is shaking sensor. If not check the wires make sure there is not staple or cuts in them. Then last thing you can check see if your door is hitting the back of the sensor mount it does happen. Also remove and ropes or handles you have fromt eh buttom of the door. That should take care of the problem. Make another post if your still having problems

Posted on Feb 10, 2009

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1 Answer

Door closes all the way but then opens again

you can try adjusting the down force. what it sounds like when the hits the bottom the force sensor is saying there is an obstruction and is opening back up . just turn the down force adjustment higher on the logic board. if this isn't the problem you may have to adjust the down travel control, it maybe trying to force the door down to far and causing the force sensor to open door back up. if it is trying to force door to far in travel when the door goes down when it hit bottom you will notice the chain sag or the t bar will bend. good luck.

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1 Answer

Door comes down and goes right back up. then the lite blinks 4 times with a click noise. the safety eyes also are not on

It sounds like you need to adjust your down limit switch and/or perhaps your motor force settings. If the limit switch is not in the sweet spot along the rail it can be triggering too soon or not in time. In your case it could be too far down the rail and thus not stopping/slowing the motor in time. Your door is then being pushed against the floor too hard. Your safety/return force is goes way over limit and tells the opener to go back. While closing your door look at your rail and if its bending when the door hits the ground, this is definitely happening. After finding the sweet spot for your down limit switch, you can readjust your return/safety force per your opener manual.

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I have a new garage door opener that has the black and purple buttons to adjust the force and travel of the door ...... eveything is working well except when the door closes it goes a little to far, the...

I have a feeling the down force adjustment is set much to high. If the door is hitting the floor hard enough to bend the rail the safety should be reversing the door to the open position. Maybe this will help.

The force adjustments control the pressure used to open and close the door. A new garage door opener from the factory is set to the lowest possible force adjustment. If you have a properly balanced door, the forces required to open and close the door should be minimal.

The force adjustments are usually located on the rear of the garage door opener and/or under one of the light lenses, If your opener has two lights. If you have lights on the side of your opener, the force adjustment will be located under the right light lens. The force adjustments are labeled with an arrow indicating open or close and numbered 1 to 9, with one being the lowest force and nine the highest. The force adjustments can only turn 260 degrees, or ¾ of a complete turn. Changes to the forces should be done in 10-degree increments. Please remember that too much force will interfere with the proper operation of the safety reversal system. Do not increase the force beyond the minimum required to close the door. Do not use the force adjustments to compensate for a sticking, binding, or unbalanced door.

Nov 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Chamberlain 4200C doesnt open or close properly

You did not sync the chain correctly. If you have not touched the travel limits, take chain off sprocket and run door to either up or down position. Put chain back on with trolley in up or down, accordingly. Tension and make final travel adjustments.

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1 Answer

I replaced the sprocket and gear assembly on my

Here are some things to check.

Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

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1 Answer

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If the bar is bending when the door closes all the way you need to adjust the 'down limit' on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover until the door stops as it should. You also may have a door sensor problem. Make sure the sensors are pointed at one another and the small light on each one is lit and not blinking.

Dec 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I just installed a sears craftsman 1/2 hp garage door opener. when i close the garage door with the remote the chain track bends up just about 12 inches before it closes all the way, and this only happens...

What is wrong is you need to adjust the limit on the door when it comes up. What it is doing is coming to far back on the track. You need to push the back limit forward away from the motor so the door does not come back and drop down on the inside of the garage. The opener is trying to push the door up hill to get it to close that is why you are getting the bend in the track.

Good Luck

Oct 19, 2009 | Sears Craftsman LiftMaster Chamberlain...

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