Brewed coffee has a sour or rancid taste even with fresh beans.

Safety first: Allow all parts to cool before disassembly.

• Deep clean removable parts: Remove the brew basket, carafe, carafe lid, and any removable spray head. Wash them thoroughly with hot water and unscented dish soap.
• Use coffee equipment cleaner: Periodically soak the carafe and basket in a coffee equipment cleaning solution designed to remove oils, then rinse well.
• Clean carafe lid mechanism: Disassemble the lid if possible and clean internal channels where coffee can stagnate.
• Regular maintenance: Establish a routine of cleaning these parts daily or after each use to prevent buildup.