1. Product Overview
The YOKEKON Cool and Warm Mist Humidifier (Model KC-MH-303) is designed to provide optimal humidity levels for large rooms up to 2500 sq ft. Featuring a substantial 4.76-gallon (18L) capacity, it offers both cool and warm mist options, customizable humidity settings, and an integrated essential oil diffuser. Its user-friendly design includes remote and touch controls, a 12-hour timer, and various safety features for peace of mind.

Image: YOKEKON Cool and Warm Mist Humidifier in a modern living room, emitting mist.
2. Important Safety Instructions
Please read and follow all safety instructions carefully before using this appliance to prevent injury or damage. Keep this manual for future reference.
- Always place the humidifier on a firm, flat, water-resistant surface at least 12 inches (30 cm) away from walls and appliances.
- Do not place the humidifier directly on carpet, rugs, or absorbent surfaces.
- Ensure the power cord is not pinched or placed under heavy objects.
- Unplug the humidifier from the power outlet before filling, cleaning, or moving it.
- Do not add essential oils directly into the water tank. Use the designated essential oil tray.
- Keep out of reach of children and pets.
- Do not cover the mist outlet or any vents.
- If the humidifier emits an unusual smell or sound, turn it off immediately and unplug it.
- The warm mist function involves heating water; avoid touching the mist outlet directly during warm mist operation.
3. Product Components
Familiarize yourself with the parts of your YOKEKON humidifier:
- Main Humidifier Unit (Water Tank & Base)
- Top Cover with Mist Outlet
- 360° Rotating Mist Nozzle
- Extended Mist Tube
- Remote Control
- Essential Oil Tray
- Power Cord
- Moving Casters (pre-installed or attachable)

Image: Visual representation of the humidifier's top-fill design, 360° nozzle, and internal components.
4. Setup Guide
4.1 Initial Unboxing and Placement
- Carefully remove all packaging materials and ensure all components are present.
- Place the humidifier on a flat, stable surface. The integrated casters allow for easy movement.
4.2 Filling the Water Tank
The humidifier features a convenient top-fill design and a large 4.76-gallon (18L) capacity, providing up to 48 hours of continuous operation.
- Ensure the humidifier is unplugged before filling.
- Open the top cover.
- Pour clean, cool tap water directly into the water tank up to the 'MAX' line indicated on the side. Do not exceed the maximum fill line.
- Close the top cover securely.

Image: Humidifier highlighting its 4.76-gallon (18L) capacity and long run time.
4.3 Attaching Mist Nozzles and Extension Tube
Choose between the compact 360° rotating mist nozzle or the extended tube for higher mist output.
- For the 360° rotating mist nozzle: Simply place it directly onto the mist outlet on the top cover. Adjust its direction as needed.
- For the extended tube: Remove the standard mist nozzle. Place the mist tube kit base onto the mist outlet, then attach the extended tube onto the base. This helps spray mist higher, preventing wetting of the floor, ideal for large rooms or tall ceilings.

Image: Step-by-step guide on how to attach the detachable extension tube.
4.4 Power Connection
- Plug the power cord into a standard 120V AC electrical outlet.
- The digital display will light up, indicating the current room humidity and temperature.
5. Operating Instructions
5.1 Control Panel and Remote Control
The humidifier can be operated using the intuitive touchscreen control panel or the included remote control. The remote offers full functionality from a distance.
5.2 Power On/Off
- Press the Power button on the control panel or remote to turn the unit on or off.
5.3 Mist Modes (Cool/Warm Mist)
Select between cool mist for most seasons or warm mist (104°F) for colder conditions.
- Press the Cool Mist button for refreshing cool mist.
- Press the Warm Mist button for soothing warm mist.
- Adjust mist output levels (Low, Medium, High) using the Mist Volume button. Max output is 1000mL/h.

Image: Humidifier illustrating the choice between cool mist for most seasons and 106°F warm mist for cold seasons.

Image: Comparison of the three mist output levels: Low (800mL/h), Medium (900mL/h), and High (1000mL/h).
5.4 Humidity Settings
Customize your desired humidity level from 40% to 90%.
- Press the Humidity button to cycle through desired humidity percentages. The built-in humidistat will maintain the set level.

Image: Humidifier demonstrating smart humidity control, optimized for a 40%-90% range with precision humidistat.
5.5 Timer Function
- Press the Timer button to set the humidifier to operate for a specific duration, up to 12 hours.
5.6 Night Light & Sleep Mode
Enhance your environment with a soothing night light or activate sleep mode for undisturbed rest.
- Press the Night Light button to turn the colorful ambient light on or off.
- Activate Sleep Mode to turn off the display lights and operate quietly (under 35dB).

Image: Humidifier in a bedroom, illustrating ultra-quiet operation (35dB), sleep mode, 12-hour timer, night lights, and essential oil function.
5.7 Essential Oil Diffuser
- Locate the essential oil tray on the back of the unit.
- Pull out the tray and add 2-5 drops of your favorite essential oil onto the aroma pad.
- Slide the tray back into place. The mist will now carry the fragrance.

Image: Humidifier in a living room, demonstrating the essential oil diffuser feature for aromatherapy.
5.8 Safety Features
- Auto Restart: The humidifier remembers your previous settings and resumes operation automatically after a power outage.
- Waterless Auto-off: The unit automatically stops working when the water tank runs out of water.
- Child Lock: Activate the child lock function to prevent accidental changes to settings.

Image: Humidifier in a plant-filled room, highlighting the Auto Restart, Waterless Auto-off, and Child Lock features.
6. Maintenance
Regular cleaning is essential to ensure optimal performance and longevity of your humidifier.
6.1 Daily Maintenance
- Empty and rinse the water tank daily.
- Wipe the inside of the tank with a clean, damp cloth.
6.2 Weekly Cleaning
- Unplug the unit and remove the top cover.
- Pour out any remaining water.
- Clean the water tank and base with a soft brush and mild detergent. Rinse thoroughly.
- For mineral buildup, fill the tank with a mixture of equal parts white vinegar and water. Let it soak for 30 minutes, then scrub and rinse.
- Wipe the mist outlet and exterior with a soft, damp cloth.
6.3 Automatic Water Injection (Optional)
The humidifier is compatible with a 1/4" float ball valve kit (not included) for automatic water refilling, eliminating manual refills.
- If using an automatic water injection kit, follow the kit's installation instructions.
- Ensure proper connection to prevent leaks.

Image: Humidifier demonstrating the Automatic Water Injection feature, suitable for a 1/4" float ball valve kit (not included).
7. Troubleshooting
If you encounter issues with your humidifier, refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or low mist output | Low water level; mineral buildup; mist outlet blocked | Refill water tank; clean transducers and water tank; ensure mist outlet is clear |
| Unusual odor | Stagnant water; dirty water tank | Empty and clean water tank; use fresh water |
| Water leakage | Tank not properly seated; overfilled tank; damaged tank | Ensure tank is correctly placed; do not overfill; contact support if damaged |
| Unit not turning on | No power; child lock active | Check power connection; deactivate child lock |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | YOKEKON |
| Model Name | KC-MH-303 |
| Capacity | 4.76 Gallons / 18 Liters |
| Floor Area Coverage | Up to 2500 Square Feet |
| Operation Mode | Ultrasonic |
| Mist Output | Max 1000mL/h |
| Humidity Control Range | 40% to 90% |
| Warm Mist Temperature | 104°F (40°C) |
| Noise Level | Under 35dB |
| Timer | Up to 12 Hours |
| Power | 120 Volts, 280 Watts |
| Product Dimensions | 11"D x 20"W x 9"H |
| Item Weight | 8.73 pounds |
| Special Features | Adjustable Humidity Control, Aroma Diffuser, Auto Shut Off, Digital Display, Humidistat, Low Water Indicator, Night Light, Quiet, Remote Control, Removable Tank, Timer, Lighted Water Level Window, Moving Casters, Auto Restart, Child Lock, DIY Automatic Water Injection |
9. Warranty & Support
YOKEKON stands behind the quality of its products.
- 1-Year Warranty: This humidifier comes with a 1-year warranty from the date of purchase. Please retain your proof of purchase.
- 24-Hour Online Support: For any questions, concerns, or technical assistance, please contact our customer support team. We are available 24 hours a day to assist you.
For support, please refer to the contact information provided in your product packaging or visit the official YOKEKON website.



