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

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1/2 hp chamberlain model 7420 door won't go up or down on it's own without assistance. I have already tried adjusting the force would like to find operator manual

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Posted on Jan 02, 2017

  • 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

paysalot
  • 10 Answers

SOURCE: My Chamberlain 1/2 HP will occasionally only open the door half way, forcing me to manually open and close the door. But then it will suddenly begin working again all on it's own. What can I do abou

most likely there is a safety overload switch that will stop if the rollers on the track ( the steel that the door rolls in) is dry and needs to be greased so it can roll in the tracks freely also check the chain for the same, the chain drive should be free of any junk stuck on it ,the chain should not be to tight or twisted in any way, if it seems to be leaning one way or the other twist it straight with a pair of pliers also be sure its power source is not share with any other appliance. let me know of your progress.

Posted on Oct 24, 2011

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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.

Sep 24, 2011 | Chamberlain Liftmaster Sears Or...

1 Answer

1/2 HP Craftman Garage Door opener When I press the opener the door only goes up 6 - 8 inches. Press the button again the door comes down and then starts back up again and then stops. If I manually...


Check to make sure you don't have a broken door spring. Also remove the cover from the motor unit and check the drive gear. It is white nylon and is just in front of the motor. It may be going bad and if it is it will be obvious. On the rear of the motor unit you will find the 'up force' adjustment. Increase this a bit and try.

Jan 26, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a 1/2 HP Liftmaster Chamberlain Garage Door Openner that will neither open nor close now. I have disconnected the door from the carrier. With the carrier up, I press the button and it goes down...


1. Lubricate the chain and the shaft or angle iron that the carrier rides on.
2. If that doesn't work, see if the opener has adjustment screws for up force and down force. If so, try increase the down force about half a turn at a time.
Write back with your results.
Gary

Dec 18, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

The garage door goes up one foot and stops..its a liftmaster professional half horsepower


Disconnect the opener from the door. Operate the opener. It should go back and forth smoothly.
Lift the door. It should go up and down without any problems.
After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Dec 06, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have Craftsman ½ HP Garage Door Opener Model 139.18458D. It reopens immediately after closing. Sometimes it works normally, and sometimes gives this problem. I have tried adjusting the close force,...


It sounds like the door is traveling too far in the down direction. When it hits the floor the safety causes it to reverse to the open position. You need to adjust the 'down limit' not the force.

Sep 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My Craftsman 1/2 Hp garage door opener doesn't stop going down despite (quite forcefully!) applying pressure in the opposite direction. It would buckle (and did) if I don't let it continue unhindered...do...


YOU NEED TO ADJUST THE DOWN FORCE.

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.
- I DO NOT RECOMMEND ADJUSTING THE DOOR YOURSELF - CALL IN A PRO FOR THAT.

IF THE ADJUSTMENT IS SUCCESFUL ADJUST THE OPEN SENSITIVITY / FORCE IN THE SAME MANNER.

HOPE THIS HELPS

Jun 28, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman Garage Opener (Unit run front & back only for 2 second)


Double check to make sure the sensors are wired correctly. The 2 solid white wires go to terminal 2 and the wires with black stripes go to terminal 3. If the wiring is correct then you possibly have a bad RPM sensor. The RPM sensor is a small circuit board just in front of the motor.

Jul 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Help! chaimberlain/sears 1/2 hp door opener prob.


Fist, turn down the force settings to half. The force settings can damage the door when turned up that high.. Your problem is with the limit settings. This is the three white screws on the bottom with the cover off. You will have to take the bottom off the gear and sprocket assembly and place the limit in the position that the trolley is and adjust the other two screws accordingly.

Jan 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman 1/2 hp door opener


replace the logic board
http://www.chamberlain-garage-door-openers.com/circuitboardcompatibilitychart.htm

Dec 16, 2007 | Sears Craftsman LiftMaster Chamberlain...

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