Dishwasher door will not close properly

8 reasons :
https://www.appliance-insurance.co.uk/appliance-insurance-articles/reasons-dishwasher-beeping/
Dishwashers equipped with an electronic control, which may display blinking lights or have beeping sounds. ... A beeping sound every 30 seconds: Indicates the dishwasher door was unlatched during the cycle. Close the dishwasher door to resume the cycle. https://products.geappliances.com/appliance/gea-support-search-content?contentId=17380

Taken From the Manual (https://media3.neff-international.com/Documents/9000816278_I.pdf)
If the appliance stops during dishwashing or does not start for no obvious reason, first run the Abort
programme function (Reset).
Terminating the programme (Reset)
1. Open the door.
2. Press START button 9 for approx. 3 sec. until all displays go out.
3. Close the door.
The remaining programme sequence for draining the residual water takes approx. 1 minute.

could you please let us know the model #
thanks
sb on the door frame if not go here for a model# finder

http://www.neff-home.com/uk/service/manual

If door won't close and you don't have a child-lock, just push the door closed a lot harder than you normally would - NEFF manual says to do that, and it worked for me! I think it just forces it to engage and 'releases' the catch, as after that it closed with just normal pressure applied.

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.

look carefully at the catch and the latch as almost all can be adjusted with just a screw driver.

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.

We actually had the same problem with our Brada dishwasher. There is a plastic clip inside the door that latches on to the dishwasher to keep the door closed. In our case this clip had flipped inside the door (periodically continues to happen to this day). To resolve we took the door apart - carefully - and flipped the clip back into proper position. You can only do this if the dishwasher is not under warranty as once you take it apart you will likely void the warranty on it.

I have the same problem with my newly installed Miele integrated dishwasher. The door does not stay open when you are trying to load dishes. I heard that there is an adjustable internal mechanism to adjust the tension on the door. But, I am still working on solving my problem.