The appliance door is open.
Close the appliance door.
The coffee machine lighting cannot be switched on.
Close the appliance door.
Switch the appliance on.
Turn the rotary control anti-clockwise to the Lock position.
The display window shows Lock activated.
Use the arrow buttons to select Lock deactivated.
The appliance is now unlocked and drinks can be made.
Check the lighting as described in the operating instructions.
Change the fluorescent light in accordance with the operating instructions.