Humidifier is very loud or vibrates excessively during operation.

Safety first: Unplug the humidifier before inspecting the fan.

Steps to reduce noise:

• Relocate unit: Place the humidifier on a stable, level surface away from edges.
• Inspect fan: Open the housing and check that the fan blade is clean and securely attached to the motor shaft.
• Tighten hardware: Tighten any loose screws holding the fan or motor bracket.
• Replace fan motor: If the motor emits grinding or rattling noises, replace the humidifier fan motor assembly.

Note: Some airflow noise is normal, but sharp rattles or grinding indicate a mechanical issue.