I have a Miele CVA 610 & have had this problem a few times.
Press & hold down Hot Water button & small coffee buttons & turn ON WITH LIGHT. Release buttons.
Press & hold Large coffee button and hold until you see two '1's on the left side of the screen. Release.
Press & hold medium coffee button until you see two '2's.
Release.
Hit & release quickly Large coffee button.
Brew unit should be reset.
Donna
March 2008