Sorry to jump in here. Your question has just appeared on my screen in the UK appliances section.
Can you post the E-Nr number from your appliance please?
It is on a label revealed when you open the door.
If the label is missing, can you post the model number from the appliance, normally 3 letters followed by numbers and letters.
The key symbol is indicating that the child lock has been activated.
This can be an accidental activation or it could be a failure of the main control board.
If it's an accidental activation then just simply press and hold the start button for 5 seconds (or slightly longer) to deactivate it.
If you need a copy of the user instruction manual, click on the link below.
Click here for the user manual
It's on rapidshare, click on free user, wait for the countdown to end then click download.
Hope this helps
Let me know how it goes or if you need more help.
Thanks for coming back and letting me know how it went.
Glad to have been able to help.
If you haven't already done so could you complete by clicking on Accept for me please?
That's just a case of taking the drawer out, taking the syphon from the conditioner compartment of the drawer, cleaning it out, ensure water flows through the syphon.
Refit to the drawer and refit the drawer.