Devola humidifier is excessively loud or emits a high-pitched whine.

Safety: Unplug before inspection.

• Check water level: Ensure the tank is adequately filled; very low water can cause unusual transducer noise.
• Fan inspection: Open the housing and check that the fan spins freely and does not touch surrounding plastic. Clean dust from blades.
• Tighten screws: Tighten any loose internal screws or clips that may be vibrating.
• Replace fan motor: If the fan is noisy despite cleaning and alignment, replace the fan motor assembly.