1. Introduction
This manual provides detailed instructions for the safe and efficient operation, maintenance, and troubleshooting of your KOIOS UHM-JS02 Ultrasonic Humidifier. Please read this manual thoroughly before use and retain it for future reference.
2. Important Safety Instructions
- Always place the humidifier on a flat, stable, and water-resistant surface.
- Do not immerse the base unit in water or other liquids.
- Keep the humidifier out of reach of children and pets.
- Unplug the appliance during filling, cleaning, and when not in use.
- Do not add water to the mist outlet. Fill only through the designated top-fill opening.
- When using hypochlorous acid water, ensure its concentration is below 50ppm for safe operation.
- The ultrasonic mist produced is cool, making it safe for households with children and pets.
3. Package Contents
- KOIOS UHM-JS02 Ultrasonic Humidifier Unit
- User Manual
4. Product Components

KOIOS UHM-JS02 Ultrasonic Humidifier with transparent water tank.
- Water Tank: Transparent tank for water storage.
- Base Unit: Contains the ultrasonic vibrator and electronic components.
- Top Cover/Mist Nozzle: Directs the mist output and houses the control panel.
- Control Panel: For power, mist level, and night light control.
- Aroma Compartment: Integrated area for essential oils.
- Power Cord: For electrical connection.
5. Setup
- Unpack: Carefully remove the humidifier and all packaging materials from the box.
- Placement: Place the humidifier on a firm, flat, and water-resistant surface, away from walls and furniture.
- Power Connection: Plug the power cord into a suitable electrical outlet.
This video provides a comprehensive guide to the KOIOS UHM-JS02 Humidifier, demonstrating its assembly, water filling, mist level adjustments, aroma function, night light operation, and cleaning procedures.
6. Operating Instructions
6.1. Filling the Water Tank
- Remove the top cover of the humidifier.
- Pour clean tap water directly into the water tank through the large opening. Do not exceed the maximum water level indicated.
- The transparent tank allows for easy monitoring of the water level.
- Replace the top cover securely.

A hand pouring water into the top-fill opening of the KOIOS UHM-JS02 Humidifier.

The transparent water tank of the KOIOS UHM-JS02 Humidifier showing the water level indicator.
6.2. Power On/Off
Press the power button on the control panel to turn the humidifier on or off.
6.3. Mist Level Adjustment
The humidifier offers 3 mist output levels. Press the mist button repeatedly to cycle through High (H), Medium (M), and Low (L) modes.
- High (H) Mode: Approximately 12-13 hours of continuous operation.
- Medium (M) Mode: Approximately 15-16 hours of continuous operation.
- Low (L) Mode: Approximately 30-31 hours of intermittent operation (18 seconds on, 18 seconds off).

Close-up of the KOIOS UHM-JS02 Humidifier control panel showing mist level indicators.
6.4. Aroma Function
To use the aroma function, open the small cap on the top cover and add a few drops of your preferred essential oil into the designated aroma compartment. Close the cap securely.

A hand adding aroma oil to the designated compartment on the KOIOS UHM-JS02 Humidifier.
6.5. Night Light
The humidifier features an indirect night light. Long-press the night light button for 3 seconds to turn the light on or off.

The KOIOS UHM-JS02 Humidifier operating with its blue night light illuminated in a dim room.
7. Maintenance
7.1. Cleaning the Water Tank
- Unplug the humidifier from the power outlet.
- Remove the top cover and the internal mist unit.
- The water tank is detachable and can be rinsed thoroughly under running water. Use a soft brush or cloth to clean any mineral deposits.
- Ensure all parts are dry before reassembling.

A person cleaning the detachable water tank of the KOIOS UHM-JS02 Humidifier under running water.
7.2. Cleaning the Ultrasonic Vibrator
Gently wipe the ultrasonic vibrator (located in the base) with a soft cloth to remove any mineral buildup. Do not use abrasive materials or harsh chemicals.
7.3. Storage
If the humidifier will not be used for an extended period, clean all parts thoroughly, ensure they are completely dry, and store the unit in a cool, dry place.
8. Troubleshooting
| Issue | Possible Cause | Solution |
|---|---|---|
| No mist output | Low water level Power not connected Unit not assembled correctly | Refill water tank Check power cord connection Ensure top cover and internal unit are properly seated |
| Unusual noise | Foreign object in water tank Insufficient water | Remove foreign objects Refill water tank |
| Water leakage | Improper assembly Overfilling the tank | Reassemble unit correctly Do not exceed MAX water level |
| Night light not working | Not activated | Long-press the night light button for 3 seconds |
9. Specifications
| Feature | Specification |
|---|---|
| Brand | KOIOS |
| Model | UHM-JS02 |
| Water Tank Capacity | 4 Liters |
| Humidification Rate | Approx. 350 mL/h (High mode) |
| Noise Level | 28 dB |
| Power Consumption | 20W |
| Coverage Area | Approx. 10-35.6 square meters (6-22 tatami mats) |
| Dimensions | 29.7 x 20.2 x 19.9 cm |
| Special Features | Top-fill, Auto-off, 3 Mist Levels, Aroma Function, Night Light, Hypochlorous Acid Water Compatible (under 50ppm) |

KOIOS UHM-JS02 Humidifier with dimensions labeled.
10. Warranty and Support
The KOIOS UHM-JS02 Humidifier and its accessories come with a 1-year warranty. An additional 6-month warranty extension is available upon product registration.
For any questions, concerns, or in the event of a malfunction, please contact our customer support. You can typically find contact information through your order history by navigating to 'Order History' and selecting 'Contact Seller'.





