1. Introduction
Thank you for choosing the Sejoy Electric Air Humidifier. This ultrasonic humidifier is designed to improve air quality and humidity in your living spaces, offering both warm and cool mist options, essential oil diffusion, and quiet operation. Please read this manual thoroughly before use to ensure proper operation and maintenance.
2. Safety Information
- Always place the humidifier on a firm, flat, water-resistant surface at least 12 inches (30 cm) away from walls and appliances.
- Do not immerse the humidifier in water or other liquids.
- Ensure the voltage matches the specifications of the humidifier (120V, 60Hz).
- Unplug the humidifier before filling, cleaning, or moving it.
- Keep out of reach of children and pets.
- Do not block the mist outlet.
- Do not add water to the base unit; only fill the water tank.
- The machine will stop working when the cover is opened for safety.
- Regularly clean the humidifier to prevent mold and bacteria growth.
3. Package Contents
- Sejoy Electric Air Humidifier (Model: JSQ-E40H1)
- User Manual
4. Product Overview
Familiarize yourself with the components and features of your Sejoy Humidifier.

Figure 1: Sejoy Humidifier highlighting LED Touch Panel, 4L Portable Water Tank, 3 Mist Levels, Sterilization and Heating, Warm/Cool Mist, 12 Hours Timing, Constant Humidity, and Quiet Sleep Mode.

Figure 2: Detailed view of the LED Touch Panel, showing controls for Real-time Humidity Bar, Mist Volume, Sleep Mode, Timing, Sterilization and Heating, Constant Humidity, and Power.

Figure 3: The top-fill design allows for easy water replenishment and direct addition of essential oils.
5. Setup
- Unpack: Carefully remove the humidifier from its packaging and place it on a stable, level surface.
- Placement: Position the humidifier in the desired room, ensuring it is away from direct sunlight, heat sources, and electronic devices. Maintain at least 12 inches (30 cm) clearance from walls.
- Fill Water Tank: Open the top cover. Pour clean, cool tap water directly into the 4L water tank. Do not exceed the maximum fill line.
- Add Essential Oils (Optional): If desired, add a few drops of your preferred essential oil directly into the water tank.
- Close Cover: Securely close the top cover. The humidifier will not operate if the cover is not properly closed.
- Connect Power: Plug the power cord into a standard 120V, 60Hz electrical outlet.
6. Operating Instructions
The humidifier features an intuitive LED touch panel for easy control.
- Power On/Off: Touch the power icon (U) on the LED panel to turn the humidifier on or off.
- Mist Level Adjustment: The humidifier offers 3 mist levels. Touch the mist volume icon to cycle through low, medium, and high mist output. The real-time humidity bar will indicate the current mist intensity.
- Warm/Cool Mist Selection:

Figure 4: Cool Mist provides fresh air, while Warm Mist includes sterilization and heating for winter comfort.
- Warm Mist: Touch the sterilization and heating button (indicated by steam and sun icon) to activate warm mist mode. This also engages the sterilization function.
- Cool Mist: Ensure the sterilization and heating button is off for cool mist operation.
- Timing Function: Touch the timer icon (12H) to set the operating time. The humidifier can be set for up to 12 hours, after which it will automatically turn off.
- Constant Humidity: Activate the constant humidity feature to maintain a desired humidity level in the room. The humidifier will automatically adjust mist output to reach and sustain this level.
- Sleep Mode: Touch the sleep mode icon (crescent moon) to enter ultra-quiet operation. In this mode, the LED display will turn off, and the humidifier will operate at its lowest noise level (≤28dB) for undisturbed rest.

Figure 5: Ultra Quiet Sleep Mode ensures minimal disturbance with LED display off, low noise, and automatic shut-off when waterless.
- Water-shortage Power-off Protection: The humidifier is equipped with an automatic shut-off feature when the water level is too low, indicated by a waterless shut-off icon.
7. Maintenance
Regular cleaning is essential for optimal performance and hygiene.
- Daily Maintenance: Empty and rinse the water tank daily. Allow it to air dry before refilling.
- Weekly Cleaning:
- Unplug the humidifier.
- Remove the top cover and water tank.
- Clean the water tank with a soft brush or cloth and a mild detergent. Rinse thoroughly.
- Clean the ultrasonic transducer (the small disc that produces mist) and the heating element (if applicable) with a soft brush and white vinegar to remove mineral deposits. Rinse thoroughly.
- Wipe down the exterior of the unit with a soft, damp cloth.
- Ensure all parts are dry before reassembling.
- Storage: If storing the humidifier for an extended period, ensure it is completely clean and dry. Store in a cool, dry place.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist output | No water in tank; Power not connected; Cover not closed properly; Transducer dirty. | Fill water tank; Check power connection; Ensure cover is securely closed; Clean transducer. |
| Unusual odor | Dirty water tank; Old water; Essential oil residue. | Clean water tank thoroughly; Use fresh water; Clean essential oil residue. |
| Excessive noise | Unit not on a flat surface; Water level too low. | Place on a flat, stable surface; Refill water tank. |
| White dust around unit | Hard water used. | Use distilled or demineralized water. Clean surfaces regularly. |
9. Specifications
| Feature | Detail |
|---|---|
| Product Name | Humidifier |
| Product Model | JSQ-E40H1 |
| Brand | Sejoy |
| Color | Blue |
| Material | ABS, PP |
| Water Tank Capacity | 4L (1.05 Gallons) |
| Operation Mode | Ultrasonic |
| Timing Function | 12 hours |
| Noise Level | ≤28dB |
| Rated Voltage | 120V |
| Rated Frequency | 60Hz |
| Rated Power | 140W |
| Humidifying Capacity | 280-420mL/h |
| Appearance Dimension | 223 × 213 × 313 mm |
| Coverage Area | 11 - 20 M² (approx. 118 - 215 sq ft) |
| Mist Outlet Quantity | Three |
| Function | Ultrasonic Sterilize, Warm/Cool Mist, Essential Oil Diffuser |
| Water-shortage Protection | Yes |
10. User Tips
- For best results and to prevent mineral buildup, use distilled or demineralized water.
- When using essential oils, start with a small amount and adjust to your preference. Clean the tank regularly to prevent oil residue buildup.
- Place the humidifier on a towel or mat to protect furniture from potential moisture.
- Ensure proper ventilation in the room to avoid over-humidification, which can lead to condensation.
- If you notice a decrease in mist output, it's often a sign that the ultrasonic transducer needs cleaning.
11. Warranty and Support
For warranty information or technical support, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.