Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener - Answered Questions & Fixed issues

Did you leave something in front of the infrared safety sensors? Or is needs resetting for motion of travel. Adjusting travel https://embed.widencdn.net/pdf/plus/cgi/1wvkfor8eb/a2175m.pdf?u=8agqx6 ..

door will not close all the way. will go partway down then reverse itself.

unpair it as there is another signal in your area on the same frequency. some frequencies can travel over a hundred meters or more. if you use a frequency monitor you will find there will be a lot of signals in your area. the original system will drown these out looking for its signal but pairing a device that has a different frequency or frequencies this can cause randone read. and will work on frequencies in this range can even be a freezer turning on etc. as every device make a signal.

Many of these devices use a code that changes each time the door is opened and closed. This feature is used to keep potential bad people from learning your operational code and entering your garage. You may have a communication problem whereby the Garage Opener needs to be reset. You may try to change the settings. If you have dip switches on the main unit in the garage, change the dip switches to another setting and write down the numbers in the order that you have the set them, Then go to the remotes, hand held and hardware placed on the outside door, and change the settings on these devices to MATCH up with the inside unit. This is a good time to REPLACE the batteries also.

No need to - the unit has adjustments to control where the door stops on closing. You need to back off a tad on the closing setting so that the door stays closed.

have you changed the battery inside the remote yet?

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.

Reset the travel distance setting on the back of the motor box

I know sometimes if the sun is shining towardso the sensor it will start to go up before hitting the floor but this soundshould like you may have a misaligned sensor or one of them going out but this doesn't explain why it hits the floor first so my answer to you is that the travel distance setting on the motor is not set right it thinks it's hitting something besides the floor the settings for the door travel distance should be on the back of the box that contains the motor I'm sure this is what is causing your problems

If you mean a repair manual the answer is not here.

We had he same issue and changed our bulb from a CFC back to a traditional bulb and the problem was solved!

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.

Try adjusting the force of the opener. Instructions are on page 25 of the manual. http://www.liftmaster.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/114A3059.pdf

take some toilet paper, or some very light rag and dust the RPM sensor over, under, inbetween and in every spot on that darn thing, and bingo, it will work. Its the plastic ribed piece mounted on the end of the motor under opener cover. If something gets under door as door starts to go down, the RPM`s will slow and thats a warning to stop and go back up. With it being dusty, it can`t sense the RPM`s properly and goes into an alarm every single time. Ugg

Phone the garge door doctor (Allready)

Please make sure you don't have broken springs first and that the door is balanced properly. If so you can replace the "Trolly" by disconnecting the arm from the opener, undoing the opener from the bracket that mounts it to the wall. This usually takes a 1/2 in wrench. Then swing the opener out far enough to slide the trolly off and replace it with a new one. Re-connect everything then re-engage the trolly.

My battery is bad. I knew it, but did not feel like it was worth any of my attention. The beeping started yesterday and this was worth my attention. Everyone in the family complained. I suspected it was the battery.

I unplugged the unit. Disconnected the battery. Waited for 30 seconds. Plugged it back in. It works fine and no beeping.

I suspect it is a warning to replace the battery.

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.

see if there is a rubber hose trim along the bottom edge and that it has no holes or cuts also a small rock or pebble could trigger it to go back up

The eyes do not stop the door from opening - They only work on the close cycle.

If the door will not open at all it may have a broken spring. Try unhooking the door from the opener.

If it works manually try the opener with the door unhooked.

NOTE: holding down the wall button overrides the safety eyes. This is the only bypass available (you need to get a new eye to replace the broken one.

Hope this helps