Levoit OasisMist Humidifier LUH-O451S-WUS Introduction

Levoit's OasisMist Humidifier LUH-O451S-WUS is a sophisticated and adaptable smart humidifier that is engineered to optimize humidity levels in your indoor space. It provides both mild and warm mist options with customizable settings, and it boasts a substantial 4.5L water tank. The VeSync app seamlessly integrates with the device, enabling remote control and scheduling via your smartphone. Additionally, it supports voice control through Amazon Alexa and Google Assistant. The OasisMist Humidifier guarantees a comfortable and pleasurable atmosphere in any room by virtue of its sleek design, quiet operation, and supplementary features, including aromatherapy.

Package Contents

1 × Smart Humidifier
1 × Cleaning Brush
3 × Aroma Pad (1 Pre-Installed)
3 × Absorption Pad (1 Pre-Installed)
2 × Water Filter Sponge (1 Pre-Installed)
1 × User Manual
1 × Quick Start Guide

Specifications

Power Supply: AC 120V, 60Hz
Rated Power: 280W
Water Tank Capacity: 1.19 gal / 4.5 L
Max Cool Mist Output: 300 mL/h
Max Warm Mist Output: 550 mL/h
Max Runtime: 45 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
- Lowest: < 26dB (Low Cool Mist)
- Highest: < 41dB (High Warm Mist)
Effective Range: 215–430 ft² / 20–40 m²
Dimensions: 10.8 x 6.0 x 11.97 in / 27.4 x 15.2 x 30.4 cm
Weight: 5.3 lb / 2.4 kg

Note: To access additional smart humidifier functions, download the free VeSync app (see page 10).

GETTING TO KNOW YOUR SMART HUMIDIFIER

A. Top Cover
B. Nozzles
C. Handle
D. Water Tank
E. Mist Tube
F. LED Display
G. Control Panel
H. Base
I. Water Filter
J. Water Filter Sponge
K. Heating Element
L. Float
M. Transducer
N. Float Brackets
O. Power Cord
P. Noise Silencer
Q. Absorption Pad
R. Air Outlet
S. Aroma Pad
T. Aroma Box
U. Humidity Sensor / Air Inlet (In Aroma Box Compartment)
V. Air Inlet (Under the Base)
W. Cleaning Brush
X. Feet
Y. Mist Channel (Under Water Tank)

OasisMist Humidifier LUH-O451S-WUS Overview

Description

The Levoit OasisMist Humidifier LUH-O451S-WUS is a high-quality humidifier that is perfect for large rooms. With its built-in humidity sensor, this humidifier can automatically adjust the mist level to maintain the optimal humidity level in your home. The large 6-liter tank means you can use this humidifier for up to 60 hours without needing to refill it, making it a great option for use overnight or during long workdays. The ultrasonic technology ensures quiet operation, while the easy-to-clean design makes maintenance a breeze.

CONTROLS

Note: You can also use the VeSync app to control these functions, as well as additional app-only features (see page 10).

On/Off Button

Press to turn the humidiﬁer on/off.
Press and hold for 5 seconds to pair with the VeSync app. See the 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 Wi-Fi® and the VeSync app (see page 10).

Mist Level Button

Press repeatedly to cycle through mist level settings: low, medium, and high mist.
Press and hold for 3 seconds to turn the display off. Press any button to turn the display back on.

Auto Mode Button

Press to turn Auto Mode on(see page 12).
Press to use warm mist while in Auto Mode.
Press / / to turn Auto Mode off and resume manual controls.

Warm Mist Button

Cycles through warm mist settings: low heat, medium heat, high heat, and heat off (see page 11).

Sleep Mode Button

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

Wi-Fi Indicator

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

No Water Indicator

Blinks when there is no water in the tank. After this indicator blinks 10 times, the humidifier will turn off. Refill the tank and properly place it on the base to use your humidifier.
Lights up when the water tank is removed. Remains on until the tank is replaced.

GETTING STARTED

Remove all packaging.
Clean the water tank and water tank cover before first use.

Note: Check to make sure that the water filter is correctly in place. If not, then rotate the filter clockwise to secure it in place. [Figure 1.1]

Choose a hard, flat location for the humidifier at least 12 inches / 30 cm away from any walls. The surface must be water-resistant. [Figure 1.2]

Note

Do not place the humidifier directly on floors, carpets, or rugs.
Placing the humidifier away from walls ensures that the humidity sensor and air inlets function properly.
Mist should be directed away from walls, furniture, bedding, and appliances. [Figure 1.3] Avoid letting too much mist fall on the side of the humidifier with the aroma box, as this may interfere with the sensor inside the aroma box.

Filling & Refilling

Note: Make sure the water tank is clean before filling.

Remove the water tank cover. [Figure 1.4]
Use the handle 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.
Using tap water may result in a white dust (dried minerals) on surfaces.

Replace the water tank cover and place the tank back on the base.

CAUTION

Do not add water directly into the base chamber. [Figure 1.7]
Do not add water through the mist tube.
Do not add essential oils into the humidifier. Only add essential oils to the aroma pad. [Figure 1.5]
Do not use water treatment liquids or third-party water filters in this humidifier.

USING YOUR SMART HUMIDIFIER

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

Plug in the humidifier. The indicators on the display will light up for 1 second, then turn off.
Press to turn your humidifier on. The humidifier will start misting.

Note: If there is no water in the tank, will flash 10 times, and the humidifier will turn off. Fill the water tank

Press repeatedly to cycle through mist settings: Low, Medium, and High. [Figure 3.1]
Rotate the nozzles to adjust the direction of the mist. [Figure 3.2]

Note

Direct the nozzles away from any furniture, walls, or other objects to prevent them from getting wet.
Do not inhale the mist directly from the nozzles.

Optionally, use the controls or the VeSync app to turn on warm mist, activate Sleep Mode, and more (see Controls, page 7).
When your room has reached your preferred humidity level, turn the humidifier to a lower setting, or turn it off. A comfortable humidity level is between 40% and 60%.

Note: You can also set the humidifier to automatically stop misting when the room reaches a specific humidity level

Press to turn your humidifier off.

Warm Mist

Press to turn on warm mist. Keep pressing to increase the heat setting of the mist, and to turn warm mist off. [Figure 3.3]
- The humidifier may take 15 minutes to warm up before producing warm mist.
- Caution: Mist may be hot. Do not place your bare hands, face, or other exposed skin over the nozzles while using warm mist. [Figure 3.4] Nozzles can reach temperatures as high as 140ºF / 60ºC.

Warm Mist Setting

Setting	Nozzle Temperature (+/- 5%)
Low Heat	104ºF / 40ºC
Medium Heat	122ºF / 50ºC
High Heat	140ºF / 60ºC

Auto Mode

Auto Mode uses the humidifier’s sensor to automatically adjust the mist level to maintain a target humidity level. The default target humidity level is 60%.

Note: You can use the VeSync app to change the target humidity level to fit your needs.

Press to turn Auto Mode on.
- The humidifier will automatically mist for 15 seconds after being turned on, even if the room has reached the target humidity level.
Optionally, press to turn on warm mist and adjust the warm mist setting.
By default, Auto Mode uses Automatic Stop. The humidifier will stop misting when the highest target humidity level is reached (default 60%).

Note:

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.
- The humidifier will continue detecting the humidity level in the room. It will start and stop misting again according to the following table:

Room Relative Humidity *	Automatic Mist Level
Under 50%	High
50–55%	Medium
55–60%	Low
Over 60%	Automatic Stop

If you change the target humidity from 60% in the VeSync app, the humidity percentages will change accordingly.

Sleep Mode

Sleep Mode changes the humidifier’s mist setting to low and turns off the display lights, making it ideal for sleep. Sleep Mode can only be used with cool mist.

Press to turn Sleep Mode on/off.

Note: Sleep Mode automatically turns off warm mist to reduce noise levels.

When Sleep Mode is on, you can press any button to wake up the display. If you stop touching the display, the display will turn off again after 6 seconds.
- Once you wake up the display, press any button to exit Sleep Mode and resume manual controls.

Turning Off the Display

The display will automatically dim after 3 seconds of inactivity.

To turn off the display, press and hold for 3 seconds.
To turn the display back on, press any button.

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 4.1]
Put 8–10 drops of essential oils on the aroma pad. [Figure 4.2]
Insert the aroma box back 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. [Figure 4.3]
The aroma pads can be cleaned and reused after diffusing essential oils
This humidifier uses a small heat-based aroma diffuser. The aroma is intended to be light.
For information on replacement aroma pads

Absorption Pads

The mineral absorption pads help reduce mineral buildup (scale) inside the humidifier, especially on the heating element.

Memory Function

The humidifier will remember your settings for Mist Level, Warm Mist, and Wi-Fi settings when turned off or unplugged, and will resume those settings when turned back on.

The humidifier will remember Sleep Mode or Auto Mode settings, and the display will automatically turn back on when the humidifier is turned back on.

Automatic Shutoff

The humidifier will automatically turn off when all of the water in the tank has been diffused. will show on the display and blink 10 times before the humidifier turns off. Fill the water tank If the tank has been removed from the base, the humidifier will automatically stop misting. will show on the display and will turn off once the tank is placed properly back on the base.

Important

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.

Do not place the humidifier on an inclined surface.
Never pour water directly into the base chamber. [Figure 5.1] 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 5.2] 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. Empty any excess water from the base chamber.

Setup Guide

Setting up the Levoit OasisMist Humidifier LUH-O451S-WUS is easy. Simply remove the tank and base from the box, fill the tank with water, and replace it on the base. Press the power button to turn on the humidifier, and use the touch controls to select your desired mist level. The humidifier will automatically adjust the mist output based on the humidity level in the room, ensuring optimal comfort and health.

CARE & MAINTENANCE

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 nozzles regularly.
If not using the humidifier for 1 week or longer, do not leave water inside. Clean and dry the humidifier instead.

Cleaning

You should clean your humidifier water tank and base chamber every 3 days, 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.

Note: If you’ve been using the warm mist setting, allow the humidifier to cool before cleaning.

Remove and rinse the water tank cover. [Figure 6.1]
Remove the water tank from the base. Pour out any water from the tank and base chamber. If you’ve used the warm mist setting, use caution in case the water is still hot.

Note: When pouring out water, hold down the float to ensure that it does not fall out of the base chamber.

Remove the water filter from the tank by rotating it counterclockwise and lifting it out. [Figure 6.2]
Remove the water filter sponge from the water filter if necessary for cleaning. [Figure 6.3]
Flip the water tank over. Pinch the tab and pull out the mist channel. [Figure 6.4]
Remove the float, noise silencer, absorption pad, and aroma box from the base.
Rinse all parts (except the outside of the base) with room temperature water. [Figure 6.5]
Dry all parts with a cloth. Make sure all parts are completely dry before reassembling or storing.

Descaling Your Humidifier

To descale the humidifier (remove mineral buildup):

Remove the water filter and water filter sponge from the tank. Flip the tank over and remove the mist channel. Then, remove the noise silencer and absorption pad from the base.
Fill the tank with 3 US cups / 710 mL of distilled white vinegar. [Figure 7.1]
Replace the tank cover and swish the vinegar around the tank. [Figure 7.2]
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 7.3]
Remove the tank, remove the tank cover, and pour out any vinegar. [Figure 7.4]
Remove the float from the base chamber by pulling up the larger side of the float 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 7.5]
Place the float, water filter, mist channel, aroma box, and noise silencer in a container. Fill with enough vinegar to cover them. Soak for 15–20 minutes. [Figure 7.6]
Use a soft cloth and the included cleaning brush to remove scale from all parts. [Figure 7.7]
Rinse all parts until any vinegar smell is completely gone. [Figure 7.8]

Cleaning the Aroma Pad & Absorption Pad

Pull out the aroma box and remove the aroma pad. [Figure 8.1]
Remove the noise silencer, then remove the absorption pad from on top of the heating element. [Figure 8.2]
Rinse the pads under warm, running water. [Figure 8.3]
Dry the pads with a clean cloth.
Place the aroma pad back into the aroma box. [Figure 8.4]
Place the absorption pad back into the base. [Figure 8.5]

Note: Do not use liquid cleaners or detergents to clean the pads or any other part of the humidifier.

Replacing the Aroma Pad & Absorption Pad

If the aroma pad or absorption pad is stiff even after cleaning, then it needs to be replaced. Extra pads are included with the humidifier. To maintain the performance of your humidifier, only use official Levoit aroma pads and absorption pads.

OasisMist Humidifier LUH-O451S-WUS Reassembling

Place the float back into the base chamber: [Figure 9.1]
- Make sure the correct side of the float is facing up.
- Insert the smaller prong into the closed side of the float brackets.
- Place the larger prong into the open (U-shaped) side of the float brackets.
Place the absorption pad and the noise silencer back over the heating element. [Figure 9.2]
Flip the water tank over and replace the mist channel. [Figure 9.3]
Make sure the water filter sponge is securely placed inside the water filter.
Place the water filter back into the tank and rotate it clockwise to secure it in place. [Figure 9.4]
Refill the tank, if necessary. Place the tank properly on the base and place the tank cover on the water tank.

Storing

Follow the cleaning instructions (see page 15) and allow all parts to dry completely before storing. Store in a cool, dry location.

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 the humidifier as described in this manual.
Place the humidifier and cord so that it 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 nozzles 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 clean the humidifier immediately after turning it off, especially if it has been diffusing warm mist. Allow the humidifier to cool down completely before cleaning.
If the humidifier is damaged or is not functioning properly, stop using it and contact Customer Support immediately (see page 26).
This humidifier is not to be used by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
Supervise children when they are near the humidifier.
Children should not clean or perform maintenance on the humidifier without supervision.
Children should be supervised to ensure that they do not play with the humidifier.
Not for commercial use. Household use only.

READ AND SAVE THESE INSTRUCTIONS

Power & Cord

Ensure that the plug fits properly into a polarized socket.
Your humidifier has a polarized plug (one prong is wider than the other), which fits into a polarized outlet only one way. This is a safety feature to reduce the risk of electric shock. If the plug does not fit, reverse the plug. If it still does not fit, do not use the plug in that outlet. Do not bypass this safety feature.
Do not handle the power cord or plug with wet hands. Keep the plug and power cord away from liquids.
If the power supply cord is damaged, it must be replaced by Arovast Corporation or similarly qualified persons in order to avoid an electric or fire hazard. Please contact Customer Support (see page 26).
Unplugging the power cord will disable remote control of the humidifier and temporarily disconnect the humidifier from VeSync and other third-party apps.

Electromagnetic Fields (EMF)

This humidifier 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.

Caution: Risk of Leaks and Electric Shock

Only add essential oils to the aroma pad.
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.

Caution: HOT Water Vapor

Let nozzles and mist tube cool before touching or cleaning.

TROUBLESHOOTING

Problem	Possible Solution
Humidifier doesn’t turn on, or turns off unexpectedly.	Plug the humidifier into a working outlet and turn it on.<br>Add purified or distilled water to the water tank.
Little or no mist comes out.	Turn the mist level to a higher setting.<br>Fill the water tank.<br>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.<br>Make sure the air inlets on the bottom of the base and in the aroma box are not blocked. The humidifier should not be set on carpet or other surfaces that may block the air inlets.<br>Clean the humidifier (see Care & Maintenance, page 15). Make sure the nozzles are not blocked or clogged.<br>Make sure the humidifier is on a level surface.<br>If the water tank or base was washed with detergent, rinse thoroughly with clean water to remove any detergent.<br>Clean the water filter (see page 17) or replace the water filter sponge with a new one. One replacement water filter sponge is included with this humidifier. For information on additional replacements, contact Customer Support (see page 26).
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.<br>Using the warm mist function will use up 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.<br>If essential oils were placed on the aroma pad, rinse the pad under clean water and allow it to dry.<br>Clean the humidifier (see Care & Maintenance, page 15).
Humidifier makes a loud or unusual noise.	Make sure the water tank is properly in place (see Getting Started, page 8).<br>Set mist level to a lower setting.<br>Empty the base chamber. Refill the water tank (not the base chamber) and place the water tank properly onto the base.<br>When using the warm mist function, the heating element may make a gurgling noise if the water level is low. Add more water to the water tank.<br>The humidifier may be malfunctioning. Stop using the humidifier and contact Customer Support (see page 26).
Mist leaks from the base.	Make sure the water tank is properly in place (see Getting Started, page 8).
White dust appears around the humidifier.	We recommend using purified or distilled water to fill the humidifier. Avoid using water with high mineral content, such as tap water.<br>Clean the humidifier (see Care & Maintenance, page 15).
Water visibly leaks from the humidifier.	Avoid running the humidifier in a room with over 60% relative humidity.<br>Wipe any excess water off the top and bottom of the base.<br>Do not shake the humidifier.<br>Make sure to place the humidifier on a flat, level surface.<br>Check the water tank for leaks. If there are leaks, contact Customer Support (see page 26).
The area around the humidifier is damp or wet from condensation.	Humidity may be too high. Turn down the mist level, turn off the humidifier, or open a door or window to the room.<br>Open a window to ensure proper airflow for the humidifier, or move the humidifier to a more well-ventilated room.<br>Make sure the water tank is properly in place (see Getting Started, page 8).<br>When replacing the water tank, wipe off excess water from the water tank and base.
Mist is not warm after pressing	Allow the humidifier to heat up for about 15 minutes to produce warm mist.<br>Clean the heating element (see Care & Maintenance, page 15).
The mist is warm on the cool mist setting.	The heating element may still be warm after being used for warm mist. Allow the heating element to cool for at least 30 minutes.
Mold grows inside the humidifier.	Clean the water tank and base chamber regularly (see Care & Maintenance, page 15).
lights up red.	Fill the water tank.<br>Place the water tank properly on the base.<br>Clean the water filter (see page 17) or replace it with a new one.<br>To request a new water filter, contact Customer Support (see page 26).
Essential oil has little or no smell.	Add more essential oil. For best results, use pure essential oil.
Display shows an incorrect humidity percentage.	The room may be larger than the humidifier’s effective range. Move to a room smaller than 215–430 ft² / 20–40 m².<br>Moisture may have built up inside the humidity sensor. Make sure the nozzles are facing away from the aroma box so that mist does not settle on the sensor inside the aroma box (see diagram in Getting To Know Your Smart Humidifier, page 8). Turn off the humidifier, remove the aroma box, and allow the sensor to air dry.<br>If the humidifier is placed within 12 inches / 30 cm of a wall or in a corner, the humidity sensor cannot provide a proper reading for the relative humidity in the room.<br>The humidity sensor will give an improper reading if it is exposed to dust. Avoid using the humidifier in dusty rooms. Avoid using tap water in the humidifier as this can increase dust in the air.
The humidity level isn’t changing in my room.	Use a higher mist level setting.<br>Depending on your environment, the humidifier may take longer to humidify your air.<br>The room may be larger than the humidifier’s effective range. If the room is larger than 215–430 ft² / 20–40 m², the humidifier will not be as effective.
Display shows Error Code “E1”, “E2”.	The humidifier is malfunctioning. Contact Customer Support (see page 26).

Warranty

Arovast Corporation (“Arovast”) warrants this product to the original purchaser to be free from defects in material and workmanship, under normal use and conditions, for a period of 2 years from the date of original purchase. Arovast agrees, at our option during the warranty period, to repair any defect in material or workmanship or furnish an equal product in exchange without charge, subject to verification of the defect or malfunction and proof of the date of purchase.

Levoit OasisMist Humidifier LUH-O451S-WUS Pros & Cons

Pros

Large 6-liter tank for up to 60 hours of operation
Automatic humidity sensor for optimal comfort and health
Ultrasonic technology for quiet operation
Easy-to-clean design with a large opening and detachable base

Cons

May be too large for small rooms
Cannot be used with essential oils

Customer Reviews

Customers love the Levoit OasisMist Humidifier LUH-O451S-WUS for its large tank, automatic humidity sensor, and quiet operation. Some common complaints include the size of the humidifier and the inability to use essential oils.

Search Manuals in: oasismist

Read More