Levoit Humidifier LUH-A251-KUS Manual

The Levoit LUH-A251-KUS is a 2.5L ultrasonic cool mist humidifier designed for medium-sized rooms. It features a 360° nozzle, adjustable mist output, optional night light, auto shut-off when water runs low, quiet operation, and a removable water tank for easy filling and cleaning. 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 Operation 6. Maintenance & Cleaning 7. Safety Precautions 8. Care & Storage 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: 2.5L Water Tank, 360° Rotating Nozzle, Control Panel, Night Light, Water Level Window, Power Adapter.

Feature	Description
2.5L Water Tank	Large capacity for up to 25 hours of operation
360° Rotating Nozzle	Adjustable mist direction for even humidification
Adjustable Mist Output	Three levels (Low, Medium, High) to control humidity
Optional Night Light	Soft blue light that can be turned on/off
Auto Shut-Off	Turns off automatically when water level is low
Quiet Operation	Ultrasonic technology for whisper-quiet performance
Removable Water Tank	Easy to fill and clean
Water Level Window	Visual indicator for remaining water
Control Knob	For power and mist level adjustment
Power Adapter	Input: 100-240V AC, 50/60Hz

Installation & Setup

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

Remove all packaging materials from the humidifier and accessories.
Place the humidifier on a flat, level surface at least 12 inches away from walls and furniture.
Fill the water tank: Remove tank from base, unscrew cap, fill with clean, cool tap water (do not exceed MAX line).
Reattach tank to base securely.
Plug the power adapter into a standard electrical outlet and connect to the humidifier.

WARNING! Use only clean, cool tap water. Do not use hot water or add essential oils directly to the water tank. Keep away from children and pets.

First-Time Use

Power on the humidifier; adjust settings as needed.

Turn the control knob to the desired mist level (Low, Medium, High).
Adjust the 360° nozzle to direct mist away from walls and electronics.
To use the night light, press the light button on the control panel (if equipped).
Monitor the water level through the window; refill when low.
The humidifier will automatically shut off when the water tank is empty.

CAUTION! Always place the humidifier on a waterproof surface. Do not operate without water in the tank.

Specifications

Model: LUH-A251-KUS
Tank Capacity: 2.5 Liters (0.66 gallons)
Room Coverage: Up to 250 sq ft (medium rooms)
Run Time: Up to 25 hours on Low setting
Mist Output: Adjustable: Low (50mL/h), Medium (80mL/h), High (120mL/h)
Noise Level: < 30 dB (Quiet)
Power Consumption: 24W Max
Power Input: 100-240V AC, 50/60Hz
Dimensions: 8.7 x 8.7 x 11.4 inches
Weight: 3.3 lbs (empty)

Controls and Operation

Control Panel: Power/Mist Level Knob, Night Light Button (if equipped).

Operation: Turn knob clockwise to power on and select mist level (Low, Medium, High). Turn counterclockwise to power off. Press the light button to toggle the night light on/off.

Nozzle Adjustment: Rotate the 360° nozzle to direct mist output as desired.

Auto Shut-Off: The humidifier will automatically turn off when the water tank is empty. The power indicator light may blink or turn off.

Refilling: Unplug the unit. Remove the water tank, refill with clean, cool water, and reattach. Plug back in and resume operation.

Maintenance & Cleaning

Regular cleaning prevents mold and mineral buildup.

Daily: Empty and rinse the water tank if not in use for more than 24 hours.
Weekly: Deep clean the tank and base.
- Unplug the humidifier.
- Remove the water tank and empty any remaining water.
- Clean the tank with a mixture of white vinegar and water (1:1 ratio). Swirl and let sit for 20 minutes.
- Rinse thoroughly with clean water.
- Wipe the base and ultrasonic plate with a soft, damp cloth. Do not submerge the base.
- Allow all parts to air dry completely before reassembly.
Filter (if applicable): This model does not have a replaceable filter. Regular cleaning of the tank is sufficient.

WARNING! Never use abrasive cleaners, detergents, or chemicals. Always unplug before cleaning.

Safety Precautions

Use only the provided power adapter.
Do not operate the humidifier without water.
Place on a flat, stable, waterproof surface.
Keep out of reach of children and pets.
Do not add essential oils, medications, or fragrances directly to the water tank.
Do not cover the mist outlet or air vents.
Unplug before moving, cleaning, or when not in use for extended periods.
If the power cord is damaged, discontinue use and contact customer service.

Care & Storage

For long-term storage, ensure the humidifier is completely dry.

Unplug the unit and empty all water from the tank and base.
Clean thoroughly as described in the Maintenance section.
Allow all parts to air dry completely for at least 24 hours.
Reassemble and store in the original box or a clean, dry place.
Do not store with water inside to prevent mold growth.

CAUTION! Store in a cool, dry place away from direct sunlight and extreme temperatures.

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 © Levoit. All rights reserved. For support, visit www.levoit.com or contact customer service at 1-888-726-8520.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty water tank, low mist setting, clogged nozzle	Refill water tank. Adjust to a higher mist setting. Clean the nozzle and ultrasonic plate.
Humidifier not turning on	No power, not plugged in, auto shut-off activated	Check power outlet. Ensure plug is secure. Refill water tank if empty.
Water leaking	Tank not seated properly, overfilled, damaged seal	Ensure tank is correctly placed on base. Do not exceed MAX fill line. Check and clean the tank seal.
White dust around humidifier	Minerals in hard water	Use distilled or demineralized water. Clean the unit more frequently.
Unusual noise	Low water level, debris in water, unit not level	Refill water tank. Use clean water. Place on a flat, level surface.
Night light not working	Light is turned off, LED issue	Press the light button to turn it on. If still not working, contact customer service.

Reset: Unplug the unit for 5 minutes, then plug back in.

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