Miele · Tumble Dryers
The interior drum lighting automatically switches off when the door is closed or after a few minutes when the door is open. This is a normal energy-saving function, not a fault.
Click steps to track your progress.
Ensure the dryer is switched on; the drum light should illuminate when the door is opened.
If the dryer is on and the door is opened, and the light still doesn't come on at all, check the main power supply to the appliance.
This is usually normal behavior; no specific troubleshooting is required unless the light never comes on under any condition.