Unit emits a musty or moldy odor when it starts or runs.

Safety: Unplug the unit. Wear gloves and a mask when cleaning moldy components.

Steps:

• Clean filter: Wash or replace the air filter.
• Clean evaporator and pan: Remove the front cover and access the evaporator coil and drain pan. Use a coil cleaner or a mild solution of water and detergent to clean surfaces. Rinse carefully without flooding electrical parts.
• Disinfect: Use an EPA-registered coil disinfectant or a diluted bleach solution (if safe for materials) in the drain pan to kill residual mold. Rinse thoroughly.
• Dry out: After cleaning, run the unit in FAN-only mode for 30–60 minutes to dry the coil and pan.

Persistent odors may require deeper disassembly and cleaning by a professional.