Miele is one of the brands with a drip pan and float switch. If the float switch is activated, the drain pump will run constantly and the washer will do nothing else.
Resetting the Miele dishwasher
Steps to reset the Miele Dishwasher-
Turn on at On/Off button.
Press and hold the Start/Stop button until the red light blinks.
Press the On/Off button to Off, then back On.
The Miele Dishwasher is now reset.
Most resets on Miele can be done by simply unplugging the washer for 5 or 10 seconds. This does not clear faults: it simply resets the CPU.
If you continue to experience difficulties, the Miele user manual can be found here.