Miele · Professional Troubleshooting Guide
The appliance's door lock mechanism has detected a fault, preventing the door from locking or unlocking properly, or the machine from starting a cycle.
Click steps to track your progress.
Ensure the door is firmly closed and latched.
Check for any obstructions around the door or latch mechanism.
Turn off the washer dryer's power supply for 30 seconds and then restore power.
Try opening and closing the door firmly a few times to reset the lock.