Moldy or stale smell from the coffee maker or brewed coffee.

Safety first: Unplug before cleaning.

• Deep clean: Wash the carafe, lid, filter holder, and permanent filter (if present) with hot water and dish soap. Rinse thoroughly.
• Empty tank daily: Do not leave water standing in the tank for days. Refill with fresh water before brewing.
• Remove used grounds: Discard used coffee grounds immediately after brewing and rinse the filter basket.
• Descale and sanitize: Run a descaling cycle, then a cycle with water only. Optionally, run a cycle with a food-safe coffee machine cleaner following the product instructions.