The film seal was not removed from the connector before the cartridge was inserted.
TwinDos cartridges: changeover from film seal to caps
TwinDos cartridges can be sealed with a film seal or a cap.
Risk of damage from film seal
If the film seal is not removed completely, leaks can occur in the TwinDos system.
Remove the film seal from the suction port on the cartridge completely before inserting the new cartridge.
Remove all of the film seal from the connector before inserting the detergent cartridge into the appliance.
If the fault persists, please contact Miele Customer Service or book a repair appointment online.
