Strong musty or moldy odor when the air conditioner runs

Safety: Turn off power and wear gloves and a mask when cleaning moldy components.

• Clean coil: Access the indoor coil and apply an EPA-approved coil cleaner or disinfectant. Rinse if required by product instructions.
• Clean drain pan: Remove sludge and biofilm from the pan. Flush with a mild bleach solution (if compatible with materials) and rinse.
• Use drain tablets: Place condensate pan treatment tablets to reduce future growth.
• Improve filtration: Install high-quality filters and replace regularly.