Levoit Humidifier LV400CH Manual

The Levoit LV400CH is a cool mist humidifier designed for medium to large rooms, featuring a 1.5-gallon (5.5L) tank, adjustable mist output, 360° nozzle, optional night light, auto shut-off, and essential oil diffuser tray. It operates quietly with ultrasonic technology and includes 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 Operation 6. Using Essential Oils 7. Cleaning & Maintenance 8. Safety Features 9. Care & Storage 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Water tank, base unit, mist nozzle, control panel, night light, essential oil tray, filter (if applicable).

Feature	Description
Large Capacity Tank	1.5-gallon (5.5L) for up to 40 hours of operation
Adjustable Mist Output	Three levels (Low, Medium, High) plus Auto mode
360° Rotating Nozzle	Direct mist in any direction
Built-in Humidity Sensor	Auto mode maintains desired humidity level
Essential Oil Tray	Add oils for aromatherapy (use only water-soluble oils)
Quiet Ultrasonic Operation	Whisper-quiet for bedroom or office use
Night Light	Optional soft glow with on/off control
Auto Shut-Off	Turns off when tank is empty or removed
Easy-Fill Design	Wide opening for convenient refilling
Filter Indicator	Reminder to clean or replace filter (if equipped)

Installation & Setup

Unpack and inspect all parts. Place on a flat, stable, water-resistant surface.

Remove tank: Lift tank from base and remove cap.
Fill with water: Use cool, distilled or filtered water for best results. Do not use hot water.
Replace cap and tank: Ensure cap is tight. Place tank back on base.
Plug into power: Use included power adapter and plug into 120V AC outlet.

WARNING! Place humidifier on a level surface away from electronics and direct sunlight. Keep out of reach of children.

First-Time Use

Power on humidifier; follow control panel prompts.

Select mode: Press POWER, then MODE to choose between Manual (Low/Med/High) or Auto.
Adjust mist direction: Rotate nozzle to desired angle.
Set night light: Press LIGHT button to turn on/off.
Monitor humidity: Display shows current room humidity in Auto mode.

CAUTION! Use only distilled or demineralized water to prevent white dust and mineral buildup.

Specifications

Tank Capacity: 1.5 gallons (5.5 liters).
Coverage Area: Up to 400 sq ft.
Run Time: Up to 40 hours on low setting.
Mist Output: Adjustable up to 300 mL/hour.
Noise Level: < 30 dB on low setting.
Power: 120V AC, 60Hz, 24W.
Dimensions: 10.8" x 10.8" x 13.4".
Weight: 5.7 lbs (empty).
Water Type: Distilled or filtered recommended.
Warranty: 2-year limited warranty.

Controls and Operation

Control Panel: POWER, MODE, MIST LEVEL (+/-), LIGHT, TIMER.

Operation Modes: Manual (choose Low, Medium, High mist), Auto (maintains 45-55% RH), Sleep (dim display, quiet operation).

Timer: Set 1-12 hours for automatic shut-off. Night Light: Soft blue light, optional. Display: Shows current humidity, mist level, timer setting, and indicators. Auto Shut-Off: Activates when water tank is empty or improperly placed.

Using Essential Oils

Only use with provided essential oil tray.

Turn off humidifier and unplug from power.
Add 3-5 drops of water-soluble essential oil to the tray (do not exceed).
Insert tray into designated slot on base.
Plug in and operate as normal.

Tip: Clean oil tray after each use to prevent clogging. Do not add oils directly to water tank.

Cleaning & Maintenance

Regular cleaning prevents mold and mineral buildup.

Daily: Wipe exterior with damp cloth.
Weekly: Empty tank, clean with mild soap and water. Rinse thoroughly.
Monthly: Deep clean base with vinegar solution (1 cup white vinegar to 1 gallon water). Run for 30 minutes, then rinse.
Filter maintenance: If equipped, rinse filter monthly; replace every 3-6 months.

WARNING! Unplug before cleaning. Never immerse base in water.

Safety Features

Auto Shut-Off: When tank is empty or removed. Overheat Protection: Internal sensor prevents overheating. Tip-Over Protection: Shuts off if unit is knocked over. BPA-Free Materials: All water-contact parts are BPA-free.

Care & Storage

When not in use for extended periods:

Unplug and empty all water.
Clean thoroughly as per monthly instructions.
Dry all parts completely.
Store in original box in a cool, dry place.

CAUTION! Do not store with water in tank to prevent mold growth.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Levoit. For support, visit www.levoit.com or contact 1-888-726-8520. ETL listed for safety. This product is not intended for medical use.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty tank or low water	Refill tank; ensure cap is tight.
Weak mist	Mineral buildup	Clean base and tank with vinegar solution.
White dust	Hard water minerals	Use distilled water only.
Unit not powering on	Power connection	Check plug and outlet; ensure tank is properly seated.
Unusual noise	Vibration or debris	Place on level surface; check for obstructions in fan.
Water leakage	Loose cap or overfilling	Tighten cap; do not exceed fill line.
Display not working	Power issue	Unplug for 10 minutes, then restart.

Reset: Unplug for 10 minutes, then restart.

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