Levoit Humidifier OasisMist LUH-O451S-WCA Manual

The Levoit OasisMist LUH-O451S-WCA is a 4.5L top-fill cool mist humidifier designed for medium to large rooms. It features a 360° nozzle, three mist levels, a built-in essential oil diffuser tray, a night light with two brightness settings, a 1-12 hour timer, auto mode for maintaining optimal humidity, and a filter-free design. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 4.5L Water Tank, 360° Rotating Nozzle, Control Panel, Essential Oil Tray, Night Light, Air Inlet, Water Level Window.

Installation & Setup

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

1. Remove all packaging materials from inside and outside the humidifier.
2. Place the unit on a stable, waterproof surface at least 12 inches away from walls and furniture.
3. Fill the water tank: Remove the tank cap, fill with clean, cool tap water (do not exceed MAX line), and replace cap securely.
4. Place the filled tank back onto the base, ensuring it is seated properly.
5. Plug the power adapter into the unit and then into a standard 120V AC outlet.

WARNING! Use only clean, cool tap water. Do not use hot water, distilled water, or add oils directly to the water tank. Ensure the unit is on a stable surface to prevent tipping.

First-Time Use

Power on the humidifier and configure initial settings.

1. Press the POWER button to turn on the unit. The default mist level is Medium.
2. Adjust mist direction by rotating the 360° nozzle to your desired angle.
3. Select mist level: Press the MIST button to cycle through Low, Medium, and High.
4. Set the timer: Press the TIMER button to set automatic shut-off from 1 to 12 hours.
5. Activate Auto Mode: Press the AUTO button to enable smart humidity control.
6. Adjust night light: Press the LIGHT button to cycle through Bright, Dim, and Off settings.

CAUTION! Before first use, clean the water tank and base according to the Care & Cleaning section. Never operate the unit without water.

Specifications

• Model: LUH-O451S-WCA (OasisMist)
• Water Tank Capacity: 4.5 Liters (1.2 Gallons)
• Room Coverage: Up to 505 sq ft (Medium to Large Room)
• Mist Output: Up to 400 mL/hr (High Setting)
• Run Time: Up to 40 hours (Low Setting)
• Operation: Ultrasonic Cool Mist
• Noise Level: ≤ 30 dB (Quiet Operation)
• Power Supply: 120V AC, 60Hz, 24W
• Timer: 1-12 Hours
• Dimensions: 10.6" x 10.6" x 13.4"
• Weight: 5.7 lbs (Empty)

Controls and Settings

All controls are located on the top control panel.

Control Panel Buttons: POWER, MIST (Level), TIMER, AUTO, LIGHT (Night Light).

Indicator Lights: Power (Blue), Mist Level (Low/Med/High), Timer (1-12H), Auto Mode (Green), Low Water (Red), Night Light (White).

Mist Levels: Low (for quiet night use), Medium (balanced), High (for quick humidification).

Timer: Press TIMER to cycle through 1, 2, 4, 8, 12 hours and Off. The unit will beep and shut off automatically.

Auto Mode: The humidifier uses a built-in sensor to monitor room humidity and automatically adjusts the mist output to maintain a comfortable level (approx. 50-60% RH).

Night Light: Press LIGHT to cycle: Bright → Dim → Off.

Operating Modes

Manual Mode: User selects mist level (Low, Medium, High).

1. Press POWER to turn on.
2. Press MIST to select desired level. The corresponding LED will light up.
3. Adjust the 360° nozzle for optimal mist direction.

Auto Mode: The unit automatically manages humidity.

1. Press AUTO to activate. The AUTO LED will light up.
2. The humidifier will start on Medium mist and adjust based on room conditions.
3. To exit, press AUTO again or change the mist level manually.

Timer Mode: Set automatic shut-off.

1. Press TIMER repeatedly to select duration (1, 2, 4, 8, 12H). The Timer LED will indicate the set time.
2. The unit will beep once and turn off when the timer ends.
3. To cancel, press TIMER until all timer LEDs are off.

Tip: Use Low mist at night for quiet operation. Use High mist when the room is very dry.

Using the Essential Oil Diffuser

The built-in essential oil tray allows for aromatherapy. DO NOT add oils directly to the water tank.

1. Ensure the humidifier is turned OFF and unplugged.
2. Locate the small rectangular essential oil tray on the side of the base.
3. Add 3-5 drops of your preferred 100% pure essential oil onto the cotton pad inside the tray (or directly into the empty tray).
4. Replace the tray cover securely.
5. Turn on the humidifier as normal. The mist will carry the aroma into the air.
6. To change scents or clean, remove the tray, discard the used pad, and wipe clean with a dry cloth.

WARNING! Use only 100% pure, water-soluble essential oils. Do not use fragrance oils, perfume, or other chemicals. Overuse of oils may damage the plastic. Clean the tray regularly to prevent clogging.

Care & Cleaning

Regular cleaning prevents mold, mineral buildup, and ensures optimal performance.

Daily/Weekly: Empty and rinse the water tank with clean water. Wipe the base with a soft, damp cloth.

Deep Cleaning (Every 1-2 Weeks):

1. Unplug the unit and empty all water.
2. Fill the water tank halfway with clean, cool water.
3. Add 2-3 teaspoons of white vinegar. Do not use bleach or harsh chemicals.
4. Swirl the solution in the tank for 1 minute, then let it sit for 15-20 minutes.
5. Scrub the interior with a soft brush (provided) or cloth.
6. Empty the vinegar solution and rinse the tank thoroughly 2-3 times with clean water.
7. Wipe the base, nozzle, and essential oil tray with a cloth dampened with a vinegar-water solution (1:1 ratio), then dry completely.
8. Allow all parts to air dry completely before reassembly and use.

CAUTION! Never immerse the base, control panel, or power adapter in water. Unplug before cleaning. Ensure all parts are completely dry before use to prevent electrical shock.

Safety Information

• Use only as directed. Intended for indoor household use only.
• Always place on a stable, level, waterproof surface.
• Keep out of reach of children and pets.
• Use only clean, cool tap water. Do not use hot water, distilled water, or add medications.
• Do not block the air inlet or nozzle.
• Unplug the unit before moving, cleaning, or when not in use for extended periods.
• Do not operate the unit without water.
• If the power cord is damaged, it must be replaced by the manufacturer or a qualified service agent.
• Do not use in areas with high humidity (e.g., bathrooms). Ideal humidity is between 40-60% RH.

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. Levoit is a registered trademark of VeSync. This product is protected by intellectual property rights. For support, visit www.levoit.com or contact customer service at 1-866-647-0755.

Troubleshooting

Reset: Unplug the unit for 2 minutes, then plug back in. This can clear minor electronic glitches.

Service: For warranty service or technical support, contact Levoit Customer Service at 1-866-647-0755 or visit support.levoit.com.