Introduction

The Levoit Ultrasonic Top-Fill Cool Humidifier Classic 300S is a highly efficient and user-friendly humidifier designed to provide optimal comfort in your home or office. Launched in 2020, this product has quickly gained popularity for its ease of use, sleek design, and advanced features. With an estimated price range of $40 to $60, it offers great value for its price. The Classic 300S is particularly useful for combating dry air, alleviating congestion, and promoting better sleep. Its top-fill design makes refilling the water tank a breeze, eliminating the hassle of flipping the unit over.

The humidifier is suitable for rooms up to 500 square feet and operates quietly, making it ideal for bedrooms, nurseries, and living rooms. It also features a built-in humidity sensor that automatically adjusts the mist output to maintain a desired humidity level. This smart feature ensures that your space remains comfortable without over-humidifying.

Package Contents

1 x Smart Ultrasonic Humidifier
3 x Aroma Pads (1 Pre-Installed)
1 x Cleaning Brush
1 x User Manual
1 x Quick Start Guide

Specifications

Power Supply	AC 220–240V, 50/60Hz
Rated Power	26W
Water Tank Capacity	6 L / 1.32 gal
Max Run Time	Up to 60 hours on low mist setting Note: The humidifier may run for a longer or shorter time depending on the environmental temperature and humidity.
Noise Level	≤ 30dB
Effective Range	20–47 m² / 215–505 ft²
Dimensions	24.5 x 19.2 x 34 cm / 9.6 x 7.5 x 13.4 in
Weight	2 kg / 4.3 lb

Note: To access additional smart humidifier functions, download the free VeSync app.

READ AND SAVE THESE INSTRUCTIONS

SAFETY INFORMATION

To reduce the risk of fire, electric shock, or another injury, follow all instructions and safety guidelines.

General Safety

Only use the humidifier as described in this manual.
Place the humidifier and cord so that they will not be knocked over. Do not place near large pieces of furniture or in high-traffic areas.
When not in use, turn the humidifier off and disconnect from power by removing the plug from the outlet.
Do not use the humidifier in wet environments.
Keep the humidifier out of reach from children.
Do not open the base or remove the water level sensor for self-servicing.
Always unplug your humidifier from the power outlet before cleaning your humidifier or detaching the water tank from the humidifier base.
Always make sure to place the humidifier on a flat, level surface before operation.
Only fill the water tank with clean water. Never fill the water tank with any other liquids.
Do not place the humidifier near sources of heat, such as stovetops, ovens, or radiators.
Do not place the humidifier directly on floors, carpets, or rugs.
Do not use other items as replacement parts for this product.
Do not cover the nozzle while the humidifier is on. Doing so may damage the humidifier.
Remove the water tank from the base before moving the humidifier.
Do not immerse the humidifier base, power cord, or plug in water.
Do not handle the power cord or plug with wet hands. Keep the plug and power cord away from liquids.
If the humidifier is damaged or is not functioning properly, stop using it and contact Customer Support immediately (see page 24).
Not for commercial use. Household use only.

Caution: Risk of Leaks and Electric Shock

Do not add essential oils, supplemental water treatment liquids, or water filters into the water tank or base chamber. This will damage the humidifier and cause leaks. Only add essential oils to the aroma pad.

GETTING TO KNOW YOUR SMART HUMIDIFIER

Nozzle
Water Tank Cover
Dust Cover
Mist Tube
Water Tank
Night Light
Base
Display
Cleaning Brush
Max Water Line (Tank)
Water Tank Handles
Power Cord
Float
Float Brackets
Aroma Box
Aroma Pad
Max Water Line (Base)
Secondary Float
Transducer
Air Outlet
Air Inlet
Humidity Sensor
Feet
Water Outlet Valve
Night Light Cover
Noise Silencer
Tank Placement Sensor

Sleep Mode Button
Wifi Indicator
Humidity Level
Timer Indicator
Mist Level Button
Night Light Button
No Water Indicator
Mist Level Indicator
Power Button

Note: The timer must be set in the VeSync app.

CONTROLS

Note: You can also control these functions using the VeSync app, as well as additional functions (see page 12).

Power Button

Press to turn the humidifier on/off.
Press and hold for 5 seconds to pair with the VeSync app. See the VeSync in-app instructions for more information.
Press and hold for 15 seconds to reset the humidifier. This will restore the humidifier’s default settings and disconnect it from the VeSync app.

Mist Level Button

Press repeatedly (or press and hold) to cycle through mist level settings: Auto Mode, Low, Medium, and High. (For more details on Auto Mode, see page 12.)
Press during Sleep Mode to turn Sleep Mode off. The humidifier will keep misting on Auto Mode.

Sleep Mode Button

Press to turn Sleep Mode on/off (see page 12).

Night Light Button

Press repeatedly to cycle through night light settings: 50%, 100%, and Off.
Press and hold for 3 seconds to turn the display and the night light off.
Press and hold for 3 seconds during Sleep Mode to turn Sleep Mode off.

Description

The Levoit Classic 300S boasts a modern and compact design that fits seamlessly into any home decor. The device is lightweight and easy to move around, making it versatile for various spaces. The top-fill mechanism allows users to simply pour water directly into the tank without having to flip the unit, reducing spills and making maintenance a breeze. The built-in humidity sensor ensures that the desired humidity level is maintained, providing optimal comfort and preventing over-humidification.

The Classic 300S also features a remote control and touch panel, allowing users to adjust settings from across the room. The LED display provides clear visibility of current humidity levels, and the timer function allows for up to 12 hours of operation before automatically shutting off.

GETTING STARTED

Remove all packaging.
Take the water tank off of the base and remove all tape, including any tape on the float. [Figure 1.1]
Choose a hard, flat location for the humidifier at least 30 cm / 12 in away from any walls. The surface must be water-resistant. [Figure 1.2]
The mist should be directed away from walls, furniture, bedding, and appliances. [Figure 1.3]

Filling & Refilling

Remove the water tank cover by holding the nozzle and pulling it upward. [Figure 1.4]
Use the handles to remove the tank from the base. Fill the tank with room-temperature water. [Figure 1.5]

Do not fill with hot water.
Note
- We recommend using purified or distilled water to fill the tank.
- Do not fill past the tank’s max water line.
CAUTION
- Do not add water directly into the base chamber. [Figure 1.6]
- Do not add water through the mist tube.
- Do not add essential oils into the humidifier. [Figure 1.7] Only add ssential oils to the aroma pad. [Figure 1.8]
- Do not use water treatment liquids or third-party water filters in this humidifier.
Replace the water tank cover and place the tank back on the base. [Figure 1.9]
Note: Make sure the nozzle on the water tank cover is placed over the mist tube, or the humidifier may not work correctly. [Figure 1.10]

VESYNC APP SETUP

Note: Due to ongoing updates and improvements, the VeSync app may be slightly different than shown in the manual. In case of any differences, follow the in-app instructions.

To download the VeSync app, scan the QR code or search “VeSync” in the Apple App Store or Google Play Store.[Figure 2.1]
Note: For Android users, choose “Allow” to use VeSync.
Open the VeSync app. If you already have an account, tap login. To create a new account, tap Sign Up.
Note: You must create your own VeSync account to use third-party services and products. These will not work with a guest account. With a VeSync account, you can also allow your family and friends to control your smart humidifier.
Follow the in-app instructions to set up your smart humidifier.
Note: You can use the VeSync app to connect your smart humidifier to Amazon Alexa or Google Assistant. Follow the in-app instructions to connect VeSync to your voice assistant.

USING YOUR SMART HUMIDIFIER

Note: Using the VeSync app allows you to control your smart humidifier remotely and access additional functions and features

Plug the humidifier. Press to turn your humidifier on.
Note: If there is no water in the tank, will flash 10 times, and the humidifier will turn off. Fill the water tank
Tap repeatedly to cycle through mist settings: Auto Mode, Low, Medium, and High. [Figure 3.1]
Note
The humidifier will not mist in Auto Mode if the humidity level is above 50%. If you want the humidifier to keep misting, change the mist setting, or change the Auto Mode settings in the VeSync app.
Rotate the nozzle to adjust the direction of the mist. [Figure 3.2]
Optionally, use the controls to activate Sleep Mode, turn the night light on/off, and more
When your room has reached your preferred humidity level, turn the humidifier to a lower setting, or turn it off. A healthy humidity level is between 40% and 50%. [Figure 3.3]
Note: You can also use Auto Mode to keep the humidity level between 40% and 50%.
Press levoit Classic 300S Smart Ultrasonic Top-Fill Cool Mist Humidifier - icon to turn your humidifier off.
Note: If there is no water in the tank or the tank is removed, the humidifier will stop misting, will flash 10 times, and the humidifier will turn off. Refill the tank and properly place it on the base to use your humidifier.

Sleep Mode

Sleep Mode changes the humidifier’s mist setting to Auto Mode, turns off the display lights, and turns off the night light.

When Sleep Mode is on, you can press to turn the night light on/off. The humidifier will stay in Sleep Mode.

Auto Mode

Auto Mode uses the humidifier’s sensor to automatically adjust the mist level (or turn it off) to maintain a comfortable and healthy level of humidity.

Auto Mode automatically adjusts the mist level to maintain 40–50% relative humidity. You can change the target humidity level in the VeSync app.
By default, Auto Mode uses Automatic Stop. The humidifier will stop misting when the highest target humidity level is reached. If the humidity drops below the target humidity level, the humidifier will begin misting again.
If Auto Mode is selected when the humidity is higher than the target humidity range, the humidifier will not start misting until the humidity lowers.
In the VeSync app, you can turn Automatic Stop on/off. If Automatic Stop is off, the humidifier will keep running on Low mist level when the highest target humidity level is reached.

VeSync App Functions

The VeSync app allows you to access additional smart functions, including those listed below.

Remote Control

Turn the humidifier on/off from your phone.
Cycle through mist levels and turn on/off Auto Mode and Sleep Mode from your phone.
Turn the display lights and night light on/off from your phone.
Customize Auto Mode settings like target humidity and auto-off.
Monitor Humidity Levels
Check current humidity levels in the humidifier’s environment.
Set Timers & Schedules
Program individual timers or create a schedule for your smart humidifier.
Third-Party Voice Control
Compatible with Amazon Alexa and Google Assistant for voice commands.
Note: The VeSync app is continually updated and app features will expand.

Important Tips

Your humidifier must have the correct level of water in the base chamber to work properly. If there is too much water in the base chamber, the humidifier cannot create mist.

Never pour water directly into the base chamber. [Figure 3.4] Only add water to the water tank. The humidifier will automatically release the correct amount of water into the base chamber.
Avoid moving or shaking the humidifier. [Figure 3.5] This may cause the water tank to release too much water into the base chamber.
Before moving the humidifier, turn it off, unplug it, and remove the water tank.
If your humidifier doesn’t produce mist correctly, check the max water line to see if there is too much water in the base chamber. Pour out extra water if water is over the max line. [Figure 3.6]

Note: The max water line is only for this purpose. Do not pour water into the base chamber.

Using the Aroma Box

Your humidifier can be used for aromatherapy.

Push the aroma box at the back of the base and pull it out. [Figure 3.7]
Put 8–10 drops of essential oil on the aroma pad. [Figure 3.8]
Place the aroma box into the humidifier.
Turn on the humidifier. The humidifier will automatically diffuse aroma when used.
Note:
- Do not add essential oils, water treatment liquids, or third-party water filters into the water tank or base chamber. Only add essential oils to the aroma pad.
- The aroma pads can be cleaned and reused after diffusing essential oils
- The aroma is intended to be light. This humidifier is not an aroma diffuser.

CARE & MAINTENANCE

Note

All maintenance should be done on a water-resistant surface, such as a kitchen counter.
Change the water daily to avoid bacteria growth.
Use a tissue or cloth to clean the nozzle regularly.
If not using the humidifier for 1 week or longer do not leave water inside. Clean and dry the humidifier instead.

Levoit Ultrasonic Top-Fill Cool Humidifier Classic 300S Cleaning

You should clean your humidifier every week, and when you’re ready to store it.
Note: Never immerse the base in water or liquid. Do not place any part of the humidifier in a dishwasher.Do not use detergents to clean the humidifier.

Unplug the humidifier.
Remove and rinse the water tank cover. [Figure 4.1]
Remove and rinse the dust cover if necessary. [Figure 4.2]
Remove the water tank from the base and pour out any water from the tank and base chamber. [Figure 4.3] Note: When pouring out water, hold down the float to ensure that it does not fall out of the base chamber.
Rinse the tank and base chamber with room temperature water. [Figure 4.4]
To descale the humidifier:
1. Fill the tank with 710 mL / 3 US cups of distilled white vinegar. [Figure 4.5]
2. Replace the tank cover and swish the vinegar around the tank. [Figure 4.6]
3. Place the tank on the base and soak for 15–20 minutes. Vinegar will drain into the base chamber and loosen scale (mineral buildup) in the tank and in the base chamber (including the transducer and float). [Figure 4.7]
4. Remove the tank, remove the tank cover, and pour out any vinegar. [Figure 4.8]
5. Flip the tank over and remove the noise silencer. To remove the noise silencer, press the release tab and gently pull away from the humidifier. [Figure 4.9]
6. Remove the float from the base chamber by pulling up the larger side of the float [Figure 4.10] and pulling the shaft out from the float brackets. One side of the float brackets is open (U-shaped) to allow the shaft to be removed. [Figure 4.11]
7. Place the float and noise silencer in a small container. Fill with enough vinegar to cover them. Soak for 15–20 minutes. [Figure 4.12]
8. Use a soft cloth and the included cleaning brush to remove scale from all parts. [Figure 4.13]
9. Rinse all parts until any vinegar smell is completely gone. [Figure 4.14]
Dry all parts with a cloth. Make sure all parts are completely dry before reassembling or storing.

Cleaning the Aroma Pad

Press the aroma box to release it from the base, and pull it out. [Figure 4.15]
Remove the aroma pad and rinse under warm, running water. [Figure 4.16]
Dry with a clean cloth and place it back into the aroma box. [Figure 4.17]
Note: Do not pour liquid cleaners or detergents into the aroma pad or box.

Reassembling

Flip the water tank over and place the noise silencer back into the tank. [Figure 4.18]
Place the float back into the base chamber:
1. Make sure the correct side of the float is facing up. [Figure 4.19]
2. Insert the smaller prong into the closed side of the float brackets. [Figure 4.20]
3. Place the larger prong into the open (U-shaped) side of the float brackets.
Place the tank back on the base. Refill the tank, if necessary.
Place the tank properly on the base and place the tank cover on the water tank.

Storing
Allow all parts to dry completely before storing. Store in a cool, dry location.

TROUBLESHOOTING

Problem	Possible Solution
The humidifier doesn’t turn on or turn off unexpectedly.	Plugin the humidifier and turn it on.
	Add purified or distilled water to the water tank.
	Check to see if the humidifier is in Auto Mode. Depending on Auto Mode settings, the humidifier may automatically turn off when the humidity level is above the target level.
Little or no mist comes out.	Turn the mist level to a higher setting.
	Fill the water tank.
	There may be too much water in the base chamber. Empty the base chamber. Refill the water tank (not the base chamber) and place the water tank properly onto the base.
	Make sure the air inlet on the bottom of the base is not blocked. The humidifier should not be set on carpet or other surfaces that may block the air inlet.
	Make sure the nozzle is not blocked or clogged.
	Make sure the humidifier is on a level surface.
	The water temperature may be too low. Turn the mist level to the highest setting and let the humidifier run for a while, then adjust to the desired setting.
	If the water tank or base was washed with detergent, rinse thoroughly with clean water to remove any detergent.
Humidifier uses water too quickly.	The humidifier uses up water based on the environmental temperature and humidity. If your environment is cold and/or dry, the humidifier will run out of water faster.
Humidifier produces an unusual smell.	If the humidifier is new, unplug and rinse all parts, then place in a cool, dry place for 12 hours.
	If essential oils were placed on the aroma pad, rinse the pad under clean water and allow it to dry.
	Clean the water tank and base chamber (see Care & Maintenance, page 15).
A humidifier makes a loud or unusual noise.	Make sure the water tank is properly in place (see Getting Started, page 7).
	Set mist level to a lower setting.
	Empty the base chamber. Refill the water tank (not the base chamber) and place the water tank properly onto the base.
	The humidifier may be malfunctioning. Stop using the humidifier and contact Customer Support (see page 24).
White dust appears around the humidifier.	We recommend using purified or distilled water to fill the humidifier. Avoid using water with high mineral content.
White dust appears around the humidifier.	Clean the humidifier (see Care & Maintenance, page 15).
Water leaks from the humidifier.	Make sure the silicone sealing ring around the water outlet valve is secure.
	Avoid running the humidifier in a room with over 60% relative humidity.
	Wipe any excess water off the top and bottom of the base.
	Do not shake the humidifier.
	Make sure to place the humidifier on a flat, level surface.
	Check the water tank for leaks. If there are leaks, contact Customer Support (see page 24).
Condensation forms around humidifiers or windows.	Humidity may be too high. Turn down the mist level, turn off the humidifier, or open a door or window to the room.
Mold grows inside the humidifier.	Clean the water tank and base chamber regularly (see Care & Maintenance, page 15).
is red.	Fill the water tank.
is red.	Place the water tank properly on the base.
The essential oil has little or no smell.	Add more essential oil. For best results, use pure essential oil.
The display shows an incorrect humidity percentage.	The room may be larger than the humidifier’s effective range. Move to a room smaller than 20–47 m² / 215–505 ft².
The display shows an incorrect humidity percentage.	Moisture may have built up inside the humidity sensor. Turn off the humidifier and allow the sensor to air dry. Make sure the nozzle is facing away from the sensor so that mist does not settle on the sensor (see diagram in Getting To Know Your Smart Humidifier, page 4).
The display shows Error Code “E1”.	The humidifier is malfunctioning. Contact Customer Support (see page 24).

VESYNC APP TROUBLESHOOTING

Why isn’t my humidifier connecting to the VeSync app?

Make sure your phone has Bluetooth turned on and is not currently connected to another Bluetooth device.
During the setup process, you must be on a secure 2.4 GHz WiFi network. Confirm that the network is working correctly.
Make sure the WiFi password you entered is correct.
Make sure your humidifier and phone are within 10 m / 30 ft of each other.
Reset the humidifier by pressing and holding it for 15 seconds. Then try connecting again.

My humidifier is offline

Make sure the humidifier is plugged in. The humidifier may appear to be offline if it is unplugged, or if the outlet does not
have power.
Refresh the VeSync menu by swiping it down on the screen.
Make sure your router is connected to the internet and your phone’s network connection is working.
Reset the humidifier using one of these options:
1. Delete the humidifier from the VeSync app. Swipe left (iOS) or press and hold (Android), then tap Delete. Then reconfigure your humidifier with the VeSync app.
2. Press and hold for 15 seconds. Then reconfigure your humidifier with the VeSync app.
  Note: Power outages, internet outages, or changing WiFi routers may cause your humidifier to go offline.

WARRANTY INFORMATION

Provost Corporation warrants all products to be of the highest quality in material, craftsmanship, and service for 2 years, effective from the date of purchase to the end of the warranty period. Warranty lengths may vary between product categories.
If you have any questions or concerns about your new product, please contact our helpful Customer Support Team.

Pros & Cons

Pros

Ease of use with top-fill design
Automatic humidity sensor for optimal comfort
Quiet operation suitable for bedrooms and nurseries
Remote control and touch panel for convenient operation
LED display showing current humidity levels
Timer function with up to 12 hours of operation
Energy-efficient with low power consumption

Cons

May require frequent cleaning to prevent bacterial growth
Not suitable for very large rooms or commercial spaces
No built-in filter; may not be as effective in areas with hard water
Some users find the LED light too bright if not dimmed

Customer Reviews

Customers have generally praised the Levoit Ultrasonic Top-Fill Cool Humidifier Classic 300S for its ease of use, quiet operation, and effective performance in maintaining comfortable humidity levels. Many users appreciate the convenience of the remote control and touch panel. However, some have noted that it requires regular cleaning and may not be ideal for very large rooms.

Most Common Complaints

Some of the most common complaints include the need for frequent cleaning to prevent bacterial growth, potential issues with mineral buildup from tap water, and the lack of a built-in filter which can affect performance in areas with hard water.

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