Something has happened to the door of my dishwasher when you open it it falls down heavily and now when I put the dishwasher on the door keeps opening

There are springs and pulleys that assist the door. They use a nylon rope that is very thin to connect the pulleys door and springs. The rope is most likely broken.

check an replace door spring

Falls open when? This unit wom't operate unless the door is secure so I assume you mean the door assist springs are disconnected or broken and the door just falls heavily to the open position after you unlatch it from the closed position. Try these, part 18 here

http://www.searspartsdirect.com/partsdirect/part-model/Kitchenaid-Parts/Dishwasher-Parts/Model-KUDI01FLSS3/0593/0130000/W0503111/00007

should attach to frame in an easy to distinguish hole or slot and to door hinges, number 2 here

http://c.searspartsdirect.com/lis_png/PLDM/W0503111-00001.png

Your springs are faulty.you have two of them and will need to pull the unit out and inspect.usually on asko dishwasher you have to order the whole tension spring assembly .

my lg door keeps on falling done something wrong with door springs ; how do i repair it.

This happens when people leave the door down, I've seen it many, many times, sometimes the door/hinge assembly can be replaced or even bent back, sometimes it totals out the unit...Good luck !

RMK...
Retired GE Factory Service

I recently had the same problem. One of the cords that attaches the door to a spring had snapped. I purchased cord replacments at the following URL and completed the repair myself. http://www.repairclinic.com/SmartSearch/SSPartDetail.aspx?PartID=1059756&PPStack=1

Good Luck, Tim K.

There is normally 2 heavy springs & cables that control the "falling" of the door located in the bottom of the machine or it the door itself. Sounds like one (or both) have snapped.