Musty or moldy odor coming from Aprilaire dehumidifier or humidifier

Safety first: Turn off and unplug the unit before cleaning. Use gloves and eye protection when using cleaners.

• Clean drain pan and line: Remove panels to access the condensate or humidifier drain pan. Clean with a mixture of water and mild detergent or a coil cleaner. Flush the drain line with a diluted bleach solution (1:10 bleach to water) and rinse thoroughly.
• Replace water panel: For humidifiers, replace the Aprilaire water panel if it is discolored or slimy.
• Clean coils: Use a non-acidic coil cleaner on the evaporator and condenser coils to remove organic buildup.
• Improve filtration: Ensure upstream HVAC filters are clean and of adequate MERV rating to reduce dust entering the unit.
• Run unit: After cleaning, run the unit to dry internal surfaces and reduce residual odor.