This guide is for Miele Dishwasher Models G 803, G 643, G 843, G 663, G 863 - but may work on your model as well.
This error is most commonly caused because the dishwasher is
1. Not letting water in / low water pressure - most likely a bad water inlet valve.
2. Not draining at all or not draining properly - most likely needs the filter cleaned (see video below for how to clean your miele dishwasher filter). It could be that you have a bad drain pump.
How to enter programming mode on Miele Incognito Dishwasher
It may not be quite that simple of a problem sometimes so here is how you enter the service mode on the Miele dishwasher to retrieve the error codes:
1. Open the dishwasher door and turn the dishwasher off.
2. Press and hold program buttons 2 and 3 while turning the dishwasher on.
Successful accessing of Service Mode 2 is indicated by flashing Salt and Intake/Drain lights.
3. Press the flashing program button 5.
4. Press the flashing program button 1.
5. One of the program button lights (1 to 5) will light up, indicating a stored fault code of F0 - F4. If none of the program buttons light, a fault code of F5 - F9 is stored. To display fault codes F5 - F9, press program button 6 once. Program button 6 will light up along with one of the other program buttons (1 to 5).
Program button 6 Not Pressed
Program button 6 Pressed