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

Safety: Turn off power at the breaker. Wear a mask and gloves to avoid inhaling mold spores or chemicals.

Steps:

• 1. Clean filters: Remove and wash filters with warm soapy water. Dry completely before reinstalling.
• 2. Access coil: Open the front panel and, if possible, remove the plastic louver assembly to expose more of the evaporator coil.
• 3. Apply coil cleaner: Use a non-rinse foaming coil cleaner approved for air conditioners. Spray evenly on the coil fins and allow it to work as directed.
• 4. Clean drain pan: Wipe the drain pan with a cloth and mild disinfectant solution. Ensure the drain outlet is clear (see leaking water fault).
• 5. Run fan-only mode: After cleaning, run the unit in Fan Only mode for 30–60 minutes to help dry the coil and reduce odors.
• 6. Regular maintenance: Repeat cleaning periodically, especially in humid climates.