Levoit Humidifier OasisMist LUH-0451S-WUS Manual

The Levoit OasisMist LUH-0451S-WUS is a top-fill ultrasonic humidifier designed for medium to large rooms. It features a 1.5-gallon (5.5L) tank, 360° mist nozzle, three mist levels, optional warm mist, auto mode, timer (1-12 hours), essential oil diffuser tray, night light, and remote control. 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. Safety Information 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Water Tank, Base Unit, 360° Mist Nozzle, Control Panel, Remote Control, Essential Oil Tray, Power Adapter.

Feature	Description
Top-Fill Design	Easy to fill directly into tank opening
1.5-Gallon Tank	Provides up to 60 hours of runtime on low mist
360° Mist Nozzle	Adjustable direction for optimal mist distribution
Three Mist Levels	Low, Medium, High for customizable humidity
Warm Mist Option	Heats mist for comfort and bacteria reduction
Auto Mode	Automatically adjusts mist based on room humidity
Timer Function	Set to run for 1-12 hours then auto shut-off
Essential Oil Tray	Separate compartment for aromatherapy
Night Light	Soft, adjustable LED light with on/off option
Remote Control	Wireless control of all main functions

Installation & Setup

Unpack and inspect all contents. Place on a flat, stable, waterproof surface away from electronics.

Remove tank: Lift tank from base unit.
Fill with water: Open top fill cap, add cool tap water (distilled recommended). Do not exceed MAX line.
Replace tank: Carefully place filled tank back onto base, ensuring proper alignment.
Connect power: Plug DC power adapter into base unit, then plug into 120V AC outlet.
Position nozzle: Adjust 360° mist nozzle to desired direction.

WARNING! Use only provided power adapter. Do not place on carpet or near heat sources.

First-Time Use

Power on humidifier; familiarize yourself with control panel.

Power: Press POWER button on control panel or remote.
Select mist level: Press MIST button to cycle through Low, Medium, High.
Set warm mist (optional): Press WARM MIST button to activate (indicator light on).
Use auto mode: Press AUTO to let humidifier maintain optimal humidity (40%-60% RH).
Set timer: Press TIMER to set auto shut-off (1-12 hours).
Adjust night light: Press LIGHT button to cycle through brightness levels or off.

CAUTION! First use may have slight plastic odor; run on high mist in ventilated area for 1 hour.

Specifications

Model: LUH-0451S-WUS (OasisMist)
Tank Capacity: 1.5 gallons (5.5 liters)
Room Coverage: Up to 500 sq ft
Run Time: Up to 60 hours (Low), 30 hours (Medium), 18 hours (High)
Mist Output: Up to 500 mL/hr
Power Consumption: 110W (Warm Mist on), 28W (Cool Mist)
Power Supply: Input: 120V AC, 60Hz; Output: 24V DC, 1.5A
Water Type: Cool tap or distilled water (distilled recommended)
Noise Level: ≤ 30 dB (Low mist)
Dimensions: 11.8" x 11.8" x 15.7"
Weight: 8.8 lbs (empty)

Controls and Settings

Control Panel: POWER, MIST (Low/Med/High), WARM MIST, AUTO, TIMER (1-12H), LIGHT, HUMIDITY SET (+/-).

Remote: POWER, MIST, WARM MIST, AUTO, TIMER, LIGHT, HUMIDITY SET.

Mist Levels: Low (quiet, long runtime), Medium (balanced), High (quick humidification). Warm Mist: Heats water to 140°F; reduces white dust. Auto Mode: Uses built-in humidity sensor to maintain set level (default 50%). Timer: Program shut-off in 1-hour increments. Night Light: Three brightness levels or off. Humidity Set: Adjust target humidity in Auto mode (40%-80%).

Operating Modes

Manual Mode: Select mist level directly. Auto Mode: Maintains set humidity. Timer Mode: Auto shut-off after set time.

For daily use: Use AUTO mode for hands-free operation.
For quick humidification: Use High mist with Warm Mist.
For nighttime: Use Low mist, turn on night light, set timer for sleep duration.
For aromatherapy: Add oils to separate tray (see section 9).

Tip: Use distilled water to minimize mineral buildup and white dust.

Maintenance & Cleaning

Regular cleaning prevents mold and mineral buildup. Unplug before cleaning.

Daily: Wipe exterior with dry cloth.
Weekly: Empty and rinse tank; clean base with soft brush and white vinegar solution (1:1 water/vinegar).
Monthly: Deep clean all parts. Soak tank and base in vinegar solution for 20 minutes, then rinse thoroughly.
Filter: This model is filter-free; ultrasonic plate may need gentle wiping if scaled.
Storage: Empty all water, dry completely, store in original box in cool, dry place.

WARNING! Never submerge base unit in water. Do not use abrasive cleaners.

Using Essential Oils

Use only with provided essential oil tray. Do not add oils directly to water tank.

Ensure humidifier is off and unplugged.
Pull out essential oil tray located on side of base unit.
Add 3-5 drops of pure essential oil to tray pad.
Slide tray back into slot securely.
Operate humidifier as normal; aroma will diffuse with mist.

CAUTION! Overuse of oils may damage tray. Clean tray weekly with water and mild soap.

Safety Information

Read all instructions before use.

Use only with provided 24V DC power adapter.
Do not operate without water in tank.
Keep out of reach of children and pets.
Do not cover mist outlet or block air vents.
Place on waterproof, level surface.
Unplug before moving, cleaning, or when not in use for extended periods.
If cord is damaged, discontinue use and contact support.
Do not use in rooms with high humidity or where water-sensitive items are present.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Levoit. All trademarks are property of Vesync Co., Ltd. This device complies with part 15 of the FCC Rules. For support, visit support.levoit.com or contact 1-888-726-8520.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty tank / Incorrect assembly	Fill tank with water; ensure tank is properly seated on base.
Low mist output	Mineral buildup / Low mist setting	Clean ultrasonic plate with vinegar; increase mist level.
White dust around unit	Hard water minerals	Use distilled water; clean unit regularly.
Water leakage	Overfilled / Loose parts	Do not exceed MAX line; check tank seal and cap.
Unusual noise	Vibrations / Debris in water	Place on flat surface; use filtered or distilled water.
Unit won't power on	No power / Adapter issue	Check outlet; ensure adapter is fully plugged into base and outlet.
Remote not working	Batteries / Obstructions	Replace batteries; ensure clear line of sight to unit.
Error code "E1"	Water level sensor issue	Unplug, empty tank, dry sensor area, restart.

Reset: Unplug for 2 minutes, then restart.

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