Introduction

The Levoit VeSync HEPA Air Purifier Core 400S is a high-performance air purifier designed to enhance indoor air quality in large spaces. Equipped with H13 True HEPA filtration, it captures 99.97% of airborne particles, including dust, pollen, and pet dander. Its smart features allow for remote control via the VeSync app, providing real-time air quality updates and scheduling options. The Levoit Core 400S is priced at $219.99.

Package Contents

1 × Smart Air Purifier
1 × True HEPA 3-Stage Original Filter (Pre-Installed)
1 × User Manual
1 × Quick Start Guide

Levoit VeSync HEPA Air Purifier Core 400S Specifications

Power Supply	AC 120V, 60Hz
Rated Power	38W
Ideal Room Size	403 ft² / 37 m² Note: • Effective for larger rooms, but purifica- tion will take longer. • Ideal Room Size is based on 5 air changes per hour (ACH).
CADR (CFM)	260 CFM / 442 m3/h
Operating Conditions	Temperature: 14°–104°F / -10°–40°C
Operating Conditions	Humidity: < 85% RH
Noise Level	24–52dB
Standby Power	< 2W
Dimensions	10.8 x 10.8 x 20.5 in / 27.4 x 27.4 x 52 cm
Weight	11 lb / 5 kg

READ AND SAVE THESE INSTRUCTIONS

SAFETY INFORMATION

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

General Safety

Only use your air purifier as described in this manual.
Do not use without removing the plastic wrap from the filter. The air purifier will not filter air, and may overheat, causing a fire hazard.
Do not use the air purifier outdoors.
Keep the air purifier away from water, and wet or damp areas. Never place in water or liquid.
Do not use in excessively humid areas.
Keep the air purifier away from heat sources.
Do not use where combustible gases, vapors, metallic dust, aerosol (spray) products, or fumes from industrial oil are present.
Keep 5 ft / 1.5 m away from where oxygen is being administered.
Supervise children when they are near the air purifier.
Do not place anything into any opening in the air purifier.
Do not sit or place heavy objects on the air purifier.
Keep the inside of the air purifier dry. To prevent moisture buildup, avoid placing in rooms with major temperature changes or underneath air conditioners.
Always unplug the air purifier before servicing (such as changing the filter).
Do not use the air purifier if it is damaged or not working correctly, or if the cord or plug is damaged. Do not try to repair it yourself.
WARNING: To reduce the risk of fire or electric shock, do not use this air purifier with solid-state speed controls (such as adimmer switch).
Not for commercial use. Household use only.

Power & Cord

Keep the air purifier near the outlet it is plugged into.
Never place the cord near any heat source.
Do not cover the cord with a rug, carpet, or other covering. Do not place the cord under furniture or appliances.
Keep the cord out of areas where people walk often. Place the cord where it will not be tripped over.
This appliance has a polarized plug (one blade is wider than the other). To reduce the risk of electric shock, this plug is intended to fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician. Do not attempt to defeat this safety feature.

Electromagnetic Fields (EMF)

Your Levoit air purifier complies with all standards regarding electromagnetic fields (EMF). If handled properly and according to the instructions in this user manual, the appliance is safe to use based on scientific evidence available today.

GETTING TO KNOW YOUR SMART AIR PURIFIER

Fan Speed Indicators
Fan Speed Button
Sleep Mode Button
Air Quality Indicator Rings
Check Filter Indicator Reset Button
Check Filter Indicator
Timer Button
On/Off Button
WiFi Indicator
Auto Mode Button
PM2.5/Timer Display
Display Off Button
Display Lock Indicator
Display Lock Button
Air Outlets
Housing
Air Inlets
AirSight Plus Laser Dust Sensor
Anti-Skid Pads
Filter Cover
True HEPA 3-Stage Original Filter

Description

The Levoit VeSync HEPA Air Purifier Core 400S boasts a modern and compact design that fits seamlessly into any room. Its 3-stage filtration system ensures comprehensive air cleaning, capturing dust, pollen, smoke, and other allergens. The True HEPA filter is particularly effective at removing microscopic particles, making it a great choice for individuals with allergies or respiratory issues.

The device features a smart sensor that continuously monitors the air quality and adjusts the fan speed accordingly in auto mode. The VeSync app allows users to check air quality, set schedules, and control the purifier remotely. With its quiet operation and energy-efficient design, the Core 400S is suitable for both daytime and nighttime use.

CONTROLS & DISPLAY

On/Off Button

Turns the air purifier on/off.
Press and hold to configure the air purifier. See the VeSync in-app instructions for more information.

Air Quality Indicator Rings

These indicators use an automatic sensor to display the air quality: Blue (Very Good), Green (Good), Orange (Moderate), and Red (Bad).

WiFi Indicator

Turns on, off, or blinks to indicate pairing status. See the VeSync in-app instructions for more information.

Fan Speed Button

Cycles through fan speeds: low (1 indicator will light up), medium (2 indicators), high (3 indicators), and turbo (4 indicators).
Tapping the Fan Speed Button while the air purifier is in Auto Mode or Sleep Mode (if the display is on) will exit that mode.

Sleep Mode Button

Turns Sleep Mode on/off.

Timer Button

Cycles through timer options.
Press and hold for 2 seconds to begin cycling through the timer options in 1-hour increments.

Auto Mode Button

Turns Auto Mode on/off.

Display Off Button

Turns the display off.
Tap any button (except ) to turn the display back on.

Display Lock Button

Prevents current settings from being changed. Press and hold for 3 seconds to turn Display Lock on/off.
The Display Lock Indicator ( ) will blink when any other button is tapped to indicate that Display Lock is on.

Check Filter Indicator Reset Button

Press and hold for 3 seconds to reset the Check Filter Indicator.
The Check Filter Indicator lights up when the filter should be checked.

GETTING STARTED

Flip the air purifier over or turn it on its side. Twist the filter cover counterclockwise and remove it. [Figure 1.1]
Remove the filter from its plastic packaging and place the filter back into the air purifier. [Figure 1.2]
Replace the filter cover and twist clockwise to lock. [Figure 1.3]
. Place the purifier on a flat, stable surface with the display facing up. Allow at least 15 inches / 38 cm of clearance on all sides. Keep away from anything that would block airflow, such as curtains. [Figure 1.4]

VeSync App Setup

To download the VeSync app, scan the QR code or search “VeSync” in the Apple App Store or Google Play Store.
Open the VeSync app. Log In or Sign Up.
Follow the in-app instructions to set up your smart air purifier.

Connect with Amazon Alexa or Google Assistant™

You can use the VeSync app to connect your smart air purifier to Amazon Alexa or Google Assistant. Please follow the in-app instructions to set up your voice assistant.

Note: You must create your own VeSync account to access voice assistants.

USING YOUR SMART AIR PURIFIER

Note: Using the VeSync app allows you to control your air purifier remotely and access additional functions and features.

Plug in and tap to turn on the air purifier. The fan will start on low speed. [Figure 2.1]
Optionally, tap to change fan speed between low, medium, high, and turbo.
Note:
- The fan speed indicators will light up when active. 1 indicator will light up for low, 2 for medium, 3 for high, and 4 for turbo.
- Turbo speed is the loudest, but cleans air the quickest.
- For best results, or to address a specific air quality issue such as smoke, run the air purifier at turbo speed for 15–20 minutes before using a lower speed.
- To effectively clean air, keep windows and doors closed while the air purifier is on.
Tap to turn off the air purifier.

Sleep Mode

Sleep Mode operates quietly by using a fan speed lower than low speed.

Tap to turn Sleep Mode on/off.
Sleep Mode will turn off the display after 3 seconds if no other buttons are tapped.

Note:

When the display is turned off, tap any button (except ) to turn the display back on. If you don’t tap another button, the display will turn off again after 3 seconds.
The Check Filter Indicator will still turn on and stay on if it’s time to check your filter.

Auto Mode

Auto Mode uses AirSight Plus, a smart laser dust sensor inside the air purifier, to adjust the fan speed automatically based on air quality. For example, if the air quality is bad, the fan will automatically be set to high speed.

Air Quality Indicator Chart
Indicator Color	Air Quality	Auto Mode Fan Speed
Blue	Very Good	Sleep Mode
Green	Good	Low
Orange	Moderate	Medium
Red	Bad	High

Note

The air purifier will take 5 seconds to detect the air quality each time it is turned on. During this time, the air quality indicator rings will be blue. After 5 seconds, the air quality indicator rings will change color based on the detected air quality.
Auto Mode does not use the Turbo fan speed.
The VeSync app also supports additional auto modes: Quiet Auto Mode and Efficient Auto Mode.

PM2.5 Display

The PM2.5 value on the display shows the amount of airborne particles (µg) that are detected per 1 cubic meter (m³) of air volume.

PM2.5 refers to particulate matter (PM) that is less than or equal to 2.5 microns (µm) in diameter. These particles, also known as “fine particles”, are so small that they can only be detected with an electron microscope, and they stay in the air longer than heavier particles such as dust and mold.

Your air purifier’s AirSight Plus laser dust sensor detects the amount of PM2.5 particles that are in a given space (µg/m³). Generally, the lower the number, the better your air quality. A number above 135 indicates that there is an unhealthy amount of fine particles in the air.

Timer

You can set a timer for 1–12 hours.

Tap . The display will switch from showing the PM2.5 reading to the time you’ve selected.
Tap repeatedly to select a time in 1-hour increments. If you don’t touch any buttons for 5 seconds, the display will switch to showing the PM2.5 reading and the timer will start automatically.
Note: Press and hold for 2 seconds to cycle through timer options automatically in 1-hour increments.
The timer will count down from your selected time.
Note:
- While a timer is active, tapping will show the remaining time, rounded up to the nearest hour. Tap again within 5 seconds to add more time in 1-hour increments.
- You can see the exact remaining time in the VeSync app.
When the timer is finished, the air purifier will turn off.
To cancel a timer, tap repeatedly until the display reads “–H”.
Note:
- You can change the fan speed at any time while the timer is on.
- The timer will restart if the time is changed.
- The air purifier will remember the last timer setting while turned off, but the timer will be cancelled and need to be restarted.
- You can set a timer for 1–24 hours in the VeSync app

Display Off

This turns off the display lights on the air purifier, including button lights and indicator lights (except the Check Filter Indicator).

Tap to turn off the display.
Tap any button (except or ) to temporarily turn the display back on. If you don’t tap another button, the display will turn back off after 3 seconds.
Tap to turn the display back on. The display will stay on.

Note: The Check Filter Indicator will still turn on and stay on if it’s time to check your filter.

Display Lock

When the air purifier is on, you can lock the display to prevent settings from being accidentally changed. Buttons will not respond to being tapped.

Press and hold for 3 seconds to lock the display. The indicator will light up in the center of the display.
Note: If the display is turned off, the indicator will flash 3 times to show that the display has been locked, then turn off.
The indicator will blink when any other button is tapped to indicate that Display Lock is on.
Tap and hold again for 3 seconds to unlock the display. The indicator will turn off.

Note:

If the display is turned off, the indicator will flash 3 times to show that the display has been unlocked.
Display Lock can still be used when the air purifier is in Standby Mode.

Standby Mode

The air purifier is in Standby Mode when it is turned off, but plugged in.

Note: Display Lock can be used while the air purifier is in Standby Mode to keep the air purifier from being turned back on. The laser dust sensor will still detect the surrounding air quality and give you updates in the VeSync app.

Memory Function

When the air purifier is plugged in and turned off, it will remember its previous fan speed, Sleep Mode, Auto Mode, Display Lock, and Display Off settings.
When the air purifier is unplugged and turned off, it will only remember its previous fan speed, Sleep Mode, and Auto Mode.

Note: The air purifier will remember the last timer setting chosen (1–12 hours), but it will not automatically resume the timer. You will need to restart the timer after the air purifier is turned back on.

VeSync App Functions

The VeSync app allows you to access additional smart air purifier functions, including those listed below. As the app develops, more features may become available.

Remote Control

Change any air purifier settings through the app, even while Display Lock is on.

Air Quality Updates

View real-time PM2.5 updates in the app.
See your air quality history for the previous week.

Auto Mode

Access additional Auto Modes: Quiet Auto Mode and Efficient Auto Mode.
Quiet Auto Mode never uses the 2 highest fan speeds to avoid making too much noise.
Efficient Auto Mode lets you choose the size of the area you want to purify. The air purifier will use the highest fan speed to clean the air in that area. Once your air is clean, it will lower to the fan speed best suited to the selected room size.

Schedules

Create and customize schedules for your air purifier to match your routines.

Timer Function

Set a timer between 1–24 hours.
Easily view the exact time remaining on a timer.

Filter Replacement Info

Keep tabs on the remaining filter life by checking the filter life percentage in the app.
Shop for replacement filters.

ABOUT THE FILTER

The air purifier uses a 3-stage filtration system to purify air.

A. Pre-Filter

Captures large particles such as dust, lint, fibers, hair, and pet fur.
Maximizes the filter’s life by protecting it.

B. H13 True HEPA Filter

Captures at least 99.97% of airborne particles 0.3 microns (µm) in size.
Traps small particles such as fine dust, smoke particles, and allergens such as pollen and pet dander.

C. Custom High-Efficiency Activated Carbon Filter

Physically adsorbs smoke, odors, and fumes.
Customized using the ARC formula to be especially effective for cooking smells and pet odors in a multi-pet household.
Filters compounds such as formaldehyde, benzene, ammonia, hydrogen sulfide, and volatile organic compounds (VOCs).

Note: Levoit air purifiers filter airborne particles 0.3 microns in size. Arovast Corporation makes no claims that this air purifier helps reduce the COVID-19 virus.

Clean Air Delivery Rate

This air purifier has a Clean Air Delivery Rate of 260 cubic feet per minute (CFM), or 442 m³/h.
Clean Air Delivery Rate (CADR) measures the efficiency of an air purifier by indicating the volume of clean air that an air purifier produces per minute. This is based on removal of dust, pollen, and smoke, which are the 3 most common indoor air pollutants. The higher the CADR, the more particles the air purifier will remove and the larger the area it can clean. The rating is measured at the air purifier’s highest speed.

Air Change Per Hour

The air change rate is how many times all of the air in a room can be purified (or “changed”) by the air purifier in 1 hour. Air changes per hour (ACH) are calculated with the recommended room size assuming 8 ft / 2.4 m ceilings. For smaller rooms, the air change per hour will increase. This air purifier has an air change per hour of 5, which means it can change air 5 times per hour at the max speed in a single, closed room up to 403 ft² / 37 m². The air purifier is effective for larger rooms, but air purification will take longer, with fewer air changes per hour.

Note: To effectively clean air, keep windows and doors closed while the air purifier is on.

Humidity

Moisture may damage the filter. This air purifier should be used in an area with a humidity level below 85% RH. If you use the air purifier in excessively humid areas, the surface of the filter may become moldy.

Note: Water or moisture will allow mold to grow. To solve a mold problem, get rid of the source of the moisture and clean up the mold.

Setup Guide

Unbox the air purifier and all included accessories.
Remove the plastic wrap from the filters and insert them into the unit as indicated.
Plug in the air purifier and turn it on.
Download and install the VeSync app if you want to use remote control features.
Follow the in-app instructions to connect the air purifier to your Wi-Fi network.
Place the air purifier at least 3 feet away from walls and any obstructions for optimal performance.

CARE & MAINTENANCE

Cleaning the Smart Air Purifier

Unplug before cleaning.
Wipe the outside of the air purifier with a soft, dry cloth. If necessary, wipe the housing with a damp cloth, then immediately dry.
Vacuum the inside of the air purifier.
Do not clean with abrasive chemicals or flammable cleaning agents.

Check Filter Indicator

will light up as a reminder to check the filter. You will also receive a notification from VeSync when it’s time to check your filter, and you can view your filter life percentage in the app at any time. Depending on how often you use the air purifier, the indicator should turn on within 6–8 months. You may not need to replace your filter yet, but you should check it when turns on.

Cleaning the Filter

The outer pre-filter should be cleaned every 2–4 weeks to increase efficiency and extend the life of your filter. Clean the pre-filter using a soft brush or vacuum hose to remove hair, dust, and large particles. [Figure 3.1] Do not clean the filter with water or other liquids.

Resetting the Check Filter Indicator

Reset the Check Filter Indicator when:

A. lights up red.

Replace the filter.
Turn on the air purifier.
Press and hold the button for 3 seconds.
will turn off when successfully reset.

B. The filter was changed before lit up.

Press and hold the button for 3 seconds.
The will flash for 3 seconds.
will turn off when successfully reset.

Filter	When to Clean	How to Clean	When to Replace
Pre-Filter	Every 2–4 weeks	Use a soft brush or vacuum hose [Figure 3.1]	6–8 months
True HEPA & Activated Carbon Filter	Do not clean		6–8 months

When Should I Replace the Filter?

The filter should be replaced every 6–8 months. You may need to replace your filter earlier or later depending on how often you use your air purifier. Using your air purifier in an environment with relatively high pollution may mean you will need to replace the filter more often, even if is off.

You may need to replace your filter if you notice:

Increased noise when the air purifier is on
Decreased airflow
Unusual odors
A visibly clogged filter

Note

To maintain the performance of your air purifier, only use official Levoit filters. To buy replacement filters, visit Levoit’s online store. Go to levoit.com for more information.
Remember to reset after changing the filter.

Cleaning the AirSight Plus Laser Dust Sensor

The AirSight Plus Laser Dust Sensor can be blocked by dust, which affects the sensor’s accuracy. Clean the sensor every 3 months. Using your air purifier in an environment with more dust may mean you will need to clean the sensor more often.

Unplug the air purifier.
Place the end of a vacuum cleaner over the sensor openings. [Figure 3.3]
Turn the vacuum on for at least 10 seconds to clean out dust.

Replacing the Filter

Unplug the air purifier. Flip the air purifier over or turn it on its side. Remove the filter cover.
Remove the old filter.
Clean out any remaining dust or hair inside the air purifier using a vacuum hose. Do not use water or liquids to clean the air purifier. [Figure 3.2]
Unwrap the new filter and place it into the housing.
Replace the cover. Plug in the air purifier.
Reset the Check Filter Indicator.

Storage

If not using the air purifier for an extended period of time, wrap both the air purifier and the filter in plastic packaging and store in a dry place to avoid moisture damage.

Troubleshooting

Problem	Possible Solution
Air purifier will not turn on or respond to button controls.	Plug in the air purifier.
	Check to see if the power cord is damaged. If it is, stop using the air purifier and contact Customer Support.
	Plug the air purifier into a different outlet.
	The air purifier may be malfunctioning. Contact Customer Support .
Airflow is significantly reduced.	Make sure the filter is removed from its packaging and properly in place.
	Tap to increase the fan speed.
	Leave 15 inches / 38 cm of clearance on all sides of the air purifier.
	The pre-filter may be clogged by large particles, such as hair or lint, blocking airflow. Clean the pre-filter .
	Replace the filter.
Air purifier makes an unusual noise while the fan is on.	Make sure the filter is properly in place with plastic packaging removed.
	Make sure the air purifier is operating on a hard, flat, level surface.
	Replace the filter.
	The air purifier may be damaged, or a foreign object may be inside. Stop using the air purifier and contact Customer Support. Do not try to repair the air purifier.
Strange smell coming from the air purifier.	Clean the filter, or replace if necessary.
	Contact Customer Support .
	Make sure not to use your air purifier in an area with high humidity or while diffusing essential oils.

Poor air purification quality.	Tap to increase the fan speed.
	Make sure no objects are blocking the sides or top of the air purifier (the inlet or outlet).
	Make sure the filter is removed from its packaging and properly in place.
	Close doors and windows while using the air purifier.
	If the room is larger than 403 ft² / 37 m², air purification will take longer. The air purifier may not be as effective in significantly larger rooms.
	Replace the filter.
is still on after replacing the filter.	Reset the Check Filter Indicator.
has not turned on within 8 months.	is a reminder for you to check the filter and will light up based on how much the air purifier has been used. If you don’t use your air purifier often, will take longer to turn on.
turned on before 6 months.	is a reminder for you to check the filter and will light up based on how much the air purifier has been used. If you run your air purifier frequently, will turn on sooner.
Air Quality Indicator always stays red.	The AirSight Plus Laser Dust Sensor may need to be cleaned.
Air Quality Indicator always stays red.	If you’re using an ultrasonic humidifier near the air purifier, the mist may affect the accuracy of the AirSight Plus Laser Dust Sensor. The sensor will detect the large mist particles, and the Air Quality Indicator may turn red. Avoid using an ultrasonic humidifier near the air purifier, or avoid using Auto Mode.
Air Quality Indicator always stays blue, even when the air quality is poor.	The AirSight Plus Laser Dust Sensor detects airborne particles, but it cannot detect gas. Make sure there isn’t gas polluting the air.
Display shows Error Code “E1”.	The motor has malfunctioned. Please contact Customer Support.

VESYNC APP TROUBLESHOOTING

My air purifier isn’t 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 2.4GHz WiFi network. Confirm that the network is working correctly.
Make sure the WiFi password you entered is correct.
- There should be no spaces at the beginning or end of the password.
- Test the password by connecting a different electronic device to the router.
- If you’re manually typing in the SSID and password, double check that both are entered correctly.
Try moving your air purifier closer to the router. Your phone should be as close as possible to your air purifier.
Your router may need to be at a higher location, away from obstructions.
Make sure your air purifier and router are away from appliances (such as microwave ovens, refrigerators, electronic devices, etc.) to avoid signal interference.
If you’re using a VPN, make sure it’s turned off while setting up your air purifier.
Disable portal authentication for your WiFi network. If portal authentication is enabled, the air purifier will not be able to access your WiFi network, and setup will fail.

Note: Portal authentication means that you need to sign in to your WiFi network through a web page before you can use the Internet.

My air purifier is offline.

Make sure the air purifier is plugged in and has power, then refresh the VeSync menu by swiping down on the screen.
Make sure your router is connected to the internet and your phone’s network connection is working.
Delete the offline air purifier from the VeSync app. Swipe left (iOS) or press and hold (Android™), then tap Delete. Reconfigure the air purifier with the VeSync app.

Note: Power outages, internet outages, or changing WiFi routers may cause the air purifier to go offline.

Levoit VeSync HEPA Air Purifier Core 400S Pros & Cons

Pros

Effective 3-stage filtration system
Smart sensor for real-time air quality monitoring
VeSync app for remote control and scheduling
Quiet operation with multiple fan speeds
Energy-efficient design
Affordable price point

Cons

Limited coverage area compared to larger models
No built-in ionizer
Requires regular filter replacements
Some users report occasional connectivity issues with the VeSync app

Customer Reviews

Customers generally praise the Levoit VeSync HEPA Air Purifier Core 400S for its effectiveness in improving indoor air quality and its user-friendly interface. Many appreciate the smart features and quiet operation. However, some users have noted occasional issues with connecting to the VeSync app and the necessity of frequent filter replacements.

Common Complaints

Occasional connectivity issues with the VeSync app.
The need for regular filter replacements.
Limited coverage area for larger rooms.

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