No coffee comes out, but you hear the grinder and pump running.

Safety first: Unplug the machine and allow it to cool before removing the brew unit.

• Check drip tray: If the tray fills with clear water during a brew attempt, the drain valve may be stuck open.
• Clean brew unit thoroughly: Remove the brew unit, rinse under warm water, and use a soft brush on the metal filter and moving parts.
• Clean coffee spouts: Remove any spout covers and clean the channels with warm water and a brush.
• Run cleaning and descaling cycles: Use Bosch cleaning tablets and descaler to clear internal residues and scale.
• If still no coffee output: The drain valve or internal lines may be blocked or defective. Professional service is recommended.