Humidifier is unusually loud, with whistling or high-pitched noise.

Safety: Unplug the unit before inspecting the fan or internal parts.

Steps:

• Clear vents: Ensure the air intake and mist outlet are not blocked by walls, curtains, or dust.
• Inspect fan: Open the housing and check that the fan spins freely and does not rub against the casing. Adjust position or replace the Argo humidifier fan wheel if warped.
• Tighten panels: Tighten any loose screws on the housing that may cause vibration or resonance.
• Replace motor: If the fan motor emits a high-pitched whine, replace the Argo humidifier fan motor.