Indoor unit emits a musty or moldy smell when starting.

Safety: Turn off power before cleaning. Use appropriate protective equipment if using chemical cleaners.

Steps:

• Clean filters: Wash filters thoroughly with mild detergent and dry completely.
• Coil cleaning: Use a non-rinse evaporator coil cleaner suitable for AC units. Spray onto the coil fins following product instructions.
• Drain cleaning: Ensure the drain pan and hose are clean and free of slime. Flush with a mixture of water and a small amount of household disinfectant.
• Dry mode: After cleaning, run the unit in Fan or Dry mode for 30–60 minutes to dry the coil and reduce odor.
• Persistent odor: Consider professional deep cleaning of the indoor unit.