Daikin indoor unit emits a musty, moldy, or unpleasant odor when operating

Safety first: Turn off the unit before cleaning. Wear gloves and a mask if sensitive to mold.

User steps:

• Remove and clean air filters with mild detergent; dry completely.
• Use a commercially available coil cleaner approved for split ACs to clean the indoor coil following the product instructions.
• Run the unit in fan-only mode for 30–60 minutes after cooling to help dry the coil.

Technician tasks:

• Perform a deep cleaning of the indoor unit (coil, blower, drain pan) using appropriate chemicals and rinsing methods.
• Check and improve drainage to reduce standing water.