Strong musty or moldy odor from the indoor unit when it starts or runs.

Safety first: Turn off power before cleaning. Wear gloves and eye protection when using coil cleaners.

Steps:

• Clean filters: Wash or replace the indoor air filters.
• Clean coil and pan: Use a no-rinse evaporator coil cleaner approved for mini-splits. Spray the coil and drain pan thoroughly and allow it to drain.
• Run dry mode: After cleaning, run the unit in DRY or FAN-ONLY mode for 30–60 minutes to help dry the coil.

Persistent odor: Consider professional cleaning of the evaporator coil and blower wheel with specialized tools and disinfectants.