Miele · Professional Troubleshooting Guide
The relay controlling the drying heater is faulty, which can affect the drying function by not engaging or disengaging the heater properly.
Click steps to track your progress.
Turn off the washer dryer's power supply.
Wait for 30 seconds and then restore power.
Check that the earth connection to the appliance is good and secure.
Try running a drying cycle to see if the error persists.