Good morning, my name is ***** ***** I will assist with your query.
What is the make and model if the dishwasher your having an issue with?
Sorry for the delay in responding, most likely the spring mechanism has failed, it may have just come off, or part of the hinge holding the spring may have failed.
The NEFF E-NR Model number S4443W8GB/16
You can pick up a new mechanism online here, for around £15, however due to the complexity of getting to the hinge would suggest you get an engineer to come out strip it down and replace it for you.
Should you wish me to recommend someone in your area please provide me with your postcode.