Levoit Humidifier LEH-B381S-WNA Manual

The Levoit Humidifier LEH-B381S-WNA is a 4-liter ultrasonic cool mist humidifier designed for medium to large rooms. It features a 360° nozzle, adjustable mist levels, a night light with multiple color options, auto mode, timer settings (1-12 hours), essential oil diffuser tray, and a built-in humidity sensor. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation & Setup 3. First-Time Use 4. Specifications 5. Controls and Settings 6. Operating Modes 7. Maintenance & Cleaning 8. Using Essential Oils 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: 4L water tank, ultrasonic mist generator, control panel with touch buttons, 360° adjustable nozzle, night light, essential oil tray, and humidity sensor.

Feature	Description
Water Tank Capacity	4 liters (1.06 gallons)
Mist Output	Up to 300 mL/hour
Mist Control	3 adjustable levels (Low, Medium, High)
Nozzle	360° rotatable for directional mist
Night Light	7 color options + off mode
Operation Modes	Manual, Auto (humidity sensor), Sleep
Timer	1 to 12 hours in 1-hour increments
Essential Oil Tray	For aromatherapy use
Power Source	AC 120V, 60Hz
Coverage Area	Up to 430 sq ft (40 m²)

Installation & Setup

Unpack and inspect all components. Place on a flat, stable, and level surface away from direct sunlight and electronics.

Remove water tank: Lift tank from base unit.
Fill with water: Open tank cap, fill with clean, cool tap water (do not exceed MAX line).
Reattach tank: Place tank back onto base, ensuring it sits securely.
Connect to power: Plug power adapter into base unit and then into a wall outlet.

WARNING! Do not use with damaged cord or plug. Keep away from children. Use only with clean water.

First-Time Use

Power on the humidifier; the control panel will illuminate.

Select mist level: Press MIST button to cycle through Low, Medium, High.
Set timer: Press TIMER to set auto-off duration (1-12 hours).
Adjust night light: Press LIGHT to cycle through colors or turn off.
Activate Auto Mode: Press AUTO to enable humidity-sensing operation.
Use Sleep Mode: Hold MIST button for 3 seconds to activate quiet operation.

CAUTION! Ensure the unit is on a waterproof surface. Do not block mist outlet.

Specifications

Model: LEH-B381S-WNA
Tank Capacity: 4L (1.06 gal)
Mist Output: 300 mL/hr max
Room Coverage: Up to 430 sq ft
Noise Level: ≤ 30 dB in Sleep Mode
Power Consumption: 25W
Power Supply: AC 120V, 60Hz
Product Dimensions: 10.2" x 7.1" x 10.6"
Weight: 3.3 lbs (empty)
Water Type: Cool tap water (distilled recommended for hard water areas)

Controls and Settings

Control Panel: POWER, MIST (level), TIMER, LIGHT, AUTO. Front Indicator: LED display for settings and humidity.

Remote Control (if included): POWER, MIST, TIMER, LIGHT, AUTO, SLEEP.

Mist Levels: Low (150 mL/hr), Medium (225 mL/hr), High (300 mL/hr). Timer: 1-12 hours. Night Light: Red, Green, Blue, Yellow, Cyan, Purple, White, Off. Auto Mode: Maintains set humidity (40%-60% RH). Sleep Mode: Dims display, reduces noise, operates at lowest mist setting.

Operating Modes

Manual Mode: Adjust mist level directly. Auto Mode: Uses built-in sensor to adjust mist output to maintain comfort humidity. Sleep Mode: Quiet operation with dimmed lights.

For daily use: Select Auto Mode for hands-free operation.
For night: Use Sleep Mode or set timer to auto-off.
For aromatherapy: Add 3-5 drops of essential oils to the tray (not into water tank).

Tip: Place humidifier at least 12 inches from walls and furniture for optimal mist distribution.

Maintenance & Cleaning

Regular cleaning prevents mold and mineral buildup.

Daily: Empty and refill tank with fresh water.
Weekly: Clean tank and base with mild soap and water. Use included cleaning brush for hard-to-reach areas.
Monthly: Descale with white vinegar solution (1:1 water/vinegar), rinse thoroughly.
Dry all parts completely before reassembly.

WARNING! Unplug before cleaning. Never immerse base unit in water. Do not use abrasive cleaners.

Using Essential Oils

Use only with the provided essential oil tray.

Remove tray from side of humidifier.
Add 3-5 drops of 100% pure essential oils.
Reinsert tray into slot.
Do not add oils directly to water tank as it may damage the unit.

CAUTION! Use oils sparingly. Keep oils away from children and pets. Discontinue use if irritation occurs.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © 2023 Levoit; trademarks of Vesync Co., Ltd. ETL listed for US and Canada. For support, visit www.levoit.com or contact 1-888-726-8520.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty tank/low water	Refill tank; ensure tank is properly seated.
Weak mist	Mineral buildup	Clean mist outlet and transducer with vinegar solution.
Water leakage	Improper assembly	Check tank seal and cap; ensure all parts are dry before use.
Unusual noise	Vibration on surface	Place on level, solid surface; check for debris in water.
Display not working	Power issue	Check power connection; ensure outlet is functional.
Auto mode not accurate	Sensor blocked	Keep sensor area clean and unobstructed.

Reset: Unplug for 1 minute, then restart.

Service: 1-888-726-8520; [email protected]; www.levoit.com