The cappuccino maker is dirty.
Remove all components and clean them
Follow the Step-By-Step guide below to achieve proper cleaning or watch the following video guide.
When cleaning the milk container, do not use detergents, abrasive sponges, or metal objects to remove any milk deposits.
Clean the milk container each time you prepare milk as described in this step by step guide
In a dishwasher (recommended):
Rinse all components and the container with hot running water (at least 40°C), then place them in the top basket of the dishwasher and run a programme at 50°C, e.g. standard ECO.
Rinse all components and the container with hot running water (at least 40°C), to remove all visible milk residues, making certain to direct the water through all the holes of the lid (image below). Next immerse all the components in hot tap water (at least 40°C) with a mild/neutral washing-up liquid for at least 30 minutes. Rinse thoroughly with hot tap water rubbing each one individually between fingers and thumbs.
Rinse the milk carafe connector thoroughly Take particular care to ensure that there are no milk residues in the air channel (see enlargement) (Image below): scrape the channel clean if need be, using a toothpick
When securely inserted, the connector can be detached only by pressing the release button on the lid.