Levoit Humidifier LUH-D301S-WUK Manual

The Levoit LUH-D301S-WUK is a 3-liter ultrasonic cool mist humidifier designed for medium to large rooms. It features a 360° nozzle, three mist levels, a built-in essential oil diffuser, optional night light, auto shut-off when water runs low or the tank is removed, and a quiet operation mode. 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. Using the Essential Oil Diffuser 7. Maintenance & Cleaning 8. Safety Features 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: 3L Water Tank, 360° Adjustable Nozzle, Control Panel, Essential Oil Tray, Night Light, Power Adapter.

FeatureDescription
Water Tank Capacity3 liters (0.8 gallons)
Mist OutputUp to 300 mL/h
Mist LevelsLow, Medium, High
Nozzle360° adjustable for directional mist control
Essential Oil DiffuserBuilt-in tray for aromatherapy
Night LightOptional soft blue light with on/off control
Operation ModesContinuous, Intermittent (optional timer)
Auto Shut-OffActivates when water is low or tank is removed
PowerAC 120V, 60Hz via included adapter
Noise Level< 30 dB in quiet mode

Installation & Setup

Unpack and inspect contents. Place on a flat, stable, and waterproof surface.

  1. Remove the water tank from the base.
  2. Fill the tank with clean, cool tap water up to the MAX line. Do not overfill.
  3. Securely reattach the tank to the base, ensuring it is properly seated.
  4. Plug the power adapter into the humidifier and then into a standard 120V AC outlet.

WARNING! Place the humidifier on a level surface away from direct sunlight, heat sources, and electronics. Ensure the power cord is not pinched or submerged.

First-Time Use

Power on the humidifier; the indicator light will illuminate.

  1. Press the POWER button to turn on the unit. The default mist level is Medium.
  2. Adjust mist output: Press the MIST button to cycle through Low, Medium, and High settings.
  3. Adjust nozzle: Rotate the 360° nozzle to direct mist away from walls, furniture, and electronics.
  4. Set night light: Press the LIGHT button to turn the soft blue night light On or Off.
  5. For essential oils: Add a few drops to the dedicated tray (see Section 7).

CAUTION! Use only clean, cool water. Do not use hot water, additives, or essential oils directly in the water tank.

Specifications

Controls and Settings

Access all functions via the touch control panel on the front of the unit.

Control Panel: POWER, MIST (Low/Med/High), LIGHT (Night Light On/Off), TIMER (1H/2H/4H/8H/OFF).

Indicator Lights: Blue light indicates power and mist level. Red light indicates low water or fault.

Mist Adjustment: Three levels for customized humidity. Timer: Set for automatic shut-off after 1, 2, 4, or 8 hours. Night Light: Optional soft blue glow. Auto Shut-Off: Activates when water level is low or tank is removed; red light will flash.

Using the Essential Oil Diffuser

The built-in essential oil tray allows for aromatherapy without contaminating the water tank.

  1. Ensure the humidifier is turned off and unplugged.
  2. Pull out the small essential oil tray located near the control panel.
  3. Add 3-5 drops of your preferred 100% pure essential oil onto the absorbent pad in the tray.
  4. Slide the tray back into its slot securely.
  5. Turn on the humidifier. The mist will carry the aroma into the air.

Tip: Clean the oil tray regularly to prevent clogging and residue buildup. Do not add oils directly to the water tank.

Maintenance & Cleaning

Regular cleaning prevents mineral buildup and ensures optimal performance.

  1. Daily: Empty and refill the tank with fresh water if not used for over 24 hours.
  2. Weekly Cleaning:
    • Unplug the unit and remove the water tank.
    • Clean the tank and base with a soft cloth and a mixture of white vinegar and water (1:1 ratio).
    • Use a soft brush to clean the ultrasonic nebulizer (metal disc at the base).
    • Rinse all parts thoroughly with clean water and allow to air dry completely.
  3. Descaling (Monthly or as needed): For hard water areas, use a descaling solution or vinegar soak to remove mineral deposits.

CAUTION! Always unplug before cleaning. Never immerse the base unit in water. Do not use abrasive cleaners or chemicals.

Safety Features

Auto Shut-Off: The humidifier will automatically power off when the water level is too low or when the water tank is removed, preventing damage to the ultrasonic nebulizer. A red indicator light will flash.

Tip-Over Protection: The unit is designed to stop mist output if tipped over.

Overheating Protection: Internal circuitry protects against motor overheating.

Regulatory Information

FCC Compliance: This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. Copyright © 2023 VeSync Corp. Levoit is a trademark of VeSync. For support, visit www.levoit.com or contact customer service at 1-888-726-8520.

Troubleshooting

SymptomPossible CauseCorrective Action
No mist outputLow water, tank not seated, power issueRefill tank; ensure tank is locked; check power connection and outlet.
Red light flashingLow water or empty tankTurn off, refill water tank, and restart.
Weak mist outputMineral buildup on nebulizerClean the ultrasonic nebulizer with vinegar and a soft brush.
Water leakingTank not sealed, overfilled, or damagedCheck tank seal and cap; do not fill past MAX line; inspect for cracks.
Unusual noiseVibration, water level low, debrisPlace on a level surface; refill water; check for foreign objects in base.
Essential oil scent weakOil tray needs cleaning/re-oilingClean oil tray and add fresh essential oil drops.

Reset: Unplug the unit for 2 minutes, then plug back in.

Service: 1-888-726-8520; www.levoit.com/support

Levoit Humidifier LUH-D301S-WUK Manual © - All Rights Reserved 2025