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

Safety first: Unplug the unit before deep cleaning.

Thorough cleaning:

• Wash the carafe, filter basket, and any removable parts with hot soapy water.
• Run a descaling cycle with vinegar and water, followed by multiple water-only cycles.

Drying:

• Leave the reservoir lid and filter basket door open when not in use to allow air circulation.

When to replace:

• If odor persists despite thorough cleaning, consider replacing the carafe and filter basket, as some odors can be absorbed into plastic and seals.