Mold or mildew smell from the coffee maker or carafe.

Safety first: Unplug before deep cleaning.

• Thorough cleaning: Disassemble all removable parts (reservoir, basket, carafe, lid) and wash with hot soapy water. Use a bottle brush for the carafe and lid channels.
• Sanitize: Run a brew cycle with a solution of 1 part white vinegar to 2 parts water. Let sit for 15 minutes, then complete the cycle and follow with 2–3 clean water cycles.
• Dry completely: Leave the lid and basket open when not in use to allow air circulation and drying.
• Replace old filters: If your Insignia model uses a charcoal water filter, replace it according to the manual.

Persistent odor after cleaning may indicate mold inside non-removable tubing, which is difficult to fully sanitize and may warrant replacement of the unit.