Sour or off-tasting coffee even with fresh beans.

Cleaning routine:

• Remove and thoroughly clean the brew group under warm water.
• Clean the coffee spouts and drip tray with mild detergent.
• Empty and wash the water tank regularly.
• Run a cleaning cycle with a tablet if supported.
• Clean the milk system with a dedicated milk system cleaner.

Repeat cleaning over several days if buildup is heavy. Regular maintenance prevents taste issues.