1. Introduction
Thank you for purchasing the LEVOIT Classic300S Ultrasonic Smart Top Fill Humidifier. This manual provides important information on how to set up, operate, maintain, and troubleshoot your humidifier to ensure optimal performance and longevity. Please read this manual thoroughly before use and retain it for future reference.
2. Product Overview & Features
The LEVOIT Classic300S is designed to provide powerful and efficient humidification for your home, featuring smart controls and a convenient top-fill design. It helps maintain a healthy environment by adjusting humidity levels automatically.

Figure 2.1: LEVOIT Classic300S Humidifier with VeSync App Interface.
- Effortless Comfort with Auto Mode: Advanced sensors automatically adjust humidity levels to maintain a consistent and healthy environment, eliminating dry air discomfort.
- Powerful and Efficient Performance: Experience 4x faster humidification, quickly relieving dry discomfort. It operates for up to 60 hours, covering an area of 505 ft², ensuring tailored humidification.
- Multi-Role Suitability for All-Day Care: Offers various modes including Aromatherapy for morning, Auto Mode for family time, Plant Mode for plant care, and Sleep Mode for undisturbed rest.
- Super-Smart App Control: Monitor and adjust your humidifier from anywhere, anytime using the free VeSync App. Customize schedules and settings for effortless convenience.
- Hassle-Free Refill, Impeccable Cleanliness: Features a 1-step top refill for leak-free pouring and easy cleaning, eliminating the need for troublesome bottom refills.
- Compatible Demineralization Cartridge: Use the official Levoit demineralization cartridge to reduce white dust, prevent mineral buildup, and extend the humidifier's lifespan for a cleaner mist.
- Water Filter Replacement: Replace the water filter regularly to extend the life of your humidifier. Distilled or purified water is recommended for optimal health.
- Aroma Pads Replacement: Replace aroma pads to help emit a stronger fragrance and protect the fragrance box.

Figure 2.2: The humidifier maintaining balanced humidity in a living space.

Figure 2.3: Versatile modes for various daily needs.

Figure 2.4: Remote control and customization via the VeSync app.

Figure 2.5: Top-fill design for easy refilling and cleaning.
3. Setup
- Unpack: Carefully remove the humidifier and all accessories from the packaging.
- Placement: Place the humidifier on a firm, flat, water-resistant surface at least 12 inches (30 cm) away from walls and appliances.
- Fill Water Tank: Remove the top cover and fill the water tank with clean, cool water. Distilled or purified water is recommended to prevent mineral buildup. Do not exceed the maximum water line.
- Add Essential Oils (Optional): If using essential oils, add a few drops to the aroma pad tray located on the side of the base.
- Connect Power: Plug the power cord into a suitable electrical outlet.
- Download VeSync App: For smart control features, download the free VeSync app from your smartphone's app store and follow the in-app instructions to pair your device.
4. Operating Instructions
The Classic300S offers various operating modes for customized humidification.
- Power On/Off: Press the power button to turn the humidifier on or off.
- Mist Level Adjustment: Use the mist level button to cycle through different mist output settings (Low, Medium, High).
- Auto Mode: Activate Auto Mode via the control panel or VeSync app. The humidifier will automatically adjust mist output to maintain your set humidity level.
- Sleep Mode: Press the Sleep Mode button to turn off display lights and operate quietly for undisturbed rest.
- Plant Mode: Utilize the VeSync app to activate Plant Mode, which optimizes humidity for plant health.
- Aromatherapy: Ensure essential oils are added to the aroma pad tray. The humidifier will diffuse the aroma along with the mist.
- App Control: Use the VeSync app to remotely control power, mist levels, set schedules, activate modes, and monitor humidity.
5. Maintenance
Regular cleaning and maintenance are crucial for the performance and lifespan of your humidifier.
Cleaning
- Daily Cleaning: Empty the water tank and base chamber daily. Wipe down all surfaces with a clean cloth.
- Weekly Cleaning: Disconnect the power. Clean the water outlet valve and ensure it rotates smoothly. Clean the float brackets to prevent mineral buildup. Use a cleaning brush (included) to clean hard-to-reach areas.
- Descaling: If mineral deposits accumulate, fill the base with 1 cup of white vinegar and let it soak for 20 minutes. Gently scrub with a brush, then rinse thoroughly.
Filter & Aroma Pad Replacement
- Water Filter: Replace the water filter regularly to extend the humidifier's life and reduce white dust. Search for
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