How do you fix the door latch?? will not latch so the machine will not operate.

This has to be a front loader - apparently the latching mechanism is not working and needs to be fixed. The machine will not operate when the door is not fully closed.

Most likely solution: The door latch assembly. When the door closes, the internal latch electronics must "sense" that the door is closed, but sometimes doesn't. When it correctly senses a closed door, it "locks" the door (electronically) and the door can't be opened until the machine has been OFF for about 100 secs. If the door doesn't "lock" when closed, it's just not sensing that it's closed. Solution: Close the door a bit more forcefully. I've seen cases where the door would need to be closed pretty hard, 3-4 times before it "locked". Once it senses the door is closed, and locks, the machine operates normally. The latch assy can be replaced, but often develops the same problem, eventually. Slamming the door won't hurt it.

The DE error or fault code indicates that the door is not latching properly. You have changed the door latch, but check the lid or door operation to be sure it's not binding and that the door alignment is correct. Also, check the door/lid hinges to be sure they're not binding.
You can also connect a multimeter across the door latch to see whether in fact it is having continuity across it when operating the door.

The DE error or fault code indicates that the door is not latching properly. Check the lid or door operation to be sure it's not binding and that the door alignment is correct. Also, check the door/lid hinges to be sure they're not binding. Finally, make sure the door catch is in place and not broken. You may need to replace the door hook/catch or the door lock assembly

The door latch is normally locked by a relay whilst the washing machine is operating to avoid accidental door opening and flooding. Once the wash is complete a timer operates and releases the door latch relay to allow door opening. The relay must have stuck. Try to turn off the mains power supply to washer and if you hear a click then relay has released and the door should open. But if no difference then the relay or latch is jammed and you will have to use a mild force with a blunt screw driver to force open the door. If this is hard then take the washing machine cover top cover out and access the switch from side. Make sure the mains power cable is taken out.

Mike, in Washington D.C., again. Of course you can do it yourself. First call Joel (Malber in NY) at 800-600-8913 or 516-294-6660 . Tell him which model machine you need a door latch for (if you aren't sure, check label in rear). Once you've received your new latch assy (about $20): Open door, and notice white plastic "ring" around glass is actually 2 pieces (front and rear) snapped together - with a seam around periphery. Unsnap (separate) them by either getting your fingernails into the seam and pulling them apart - or prying them open with a spackle knife or thin screwdriver blade. Once it starts coming apart, just work the opening all the way around. Remove front "ring" and set aside. Using a 1.5mm Torx screwdriver, remove 2 small screws holding broken latch assy. Note the way the ends of the spring go under the 2 screws. That's the way it has to go back. Slip new latch assy into place, pressing vertical "hinge pin" and ends of spring into slots (near screw holes). Replace 2 screws. Test latch with door open - is it working? Try closing door. All good? Replace front "ring": Open door and, while pulling out on latch handle, slip the ring over the latch handle and get it into approximate position. Let go of latch (it snaps into "closed" position) and adjust ring so it doesn't bind the latch handle (meaning it's free to move). Now, beginning anywhere on outside edge, begin snapping rings together - and continue all the way around. Test that door latch still operates smoothly and that door latches shut properly. FYI: There is no adjustment for this latch assy - it just fits precisely where it's supposed to. Good luck and God Bless ...

there is a switch in the door latch that tells the unit the door is closed so it can start to operate if there is a fault or a peace of the latch has broken off the unit will read door open check the latch for any broken off peaces if it looks good replace the inter lock unit on the machine

You need to operate the door release handle at the same time as applying pressure to the latch you can see just inside the door (imagine which way it would move if the thing was working as designed), the tech has possibly simulated a door closed position for testing purposes.

The latch on many dishwashers is adjustable. If your door is easy to close but difficult to latch, adjust the latch to let the door close more easily. If you can't see any way to adjust the latch, yours may be fixed in a certain position. Check for other reasons for the latching problem.

This is because of the broken latch. There are switches inside the oven that are operated by the door latches to make sure you're not trying to use the oven with the door open. With the new door, your oven should be back to normal.