1. Introduction
Thank you for purchasing the HJTHJT 500ML Essential Oil Diffuser WPD1. This device combines the benefits of an aroma diffuser and a humidifier, designed to enhance your environment with soothing aromas and optimal humidity. It features a large 500ml capacity, remote control operation, customizable 14-color LED lighting, and quiet performance. Please read this manual thoroughly before use to ensure proper operation and maintenance.
2. Package Contents
Please check the package for the following items:
- HJTHJT 500ML Essential Oil Diffuser Unit
- Remote Control
- Power Adapter
- User Manual
3. Product Overview
The HJTHJT 500ML Essential Oil Diffuser WPD1 features a sleek design with a wood-grain finish. It includes intuitive controls on the unit and a convenient remote control for ease of use.

Image: The HJTHJT 500ML Essential Oil Diffuser WPD1, showcasing its dark wood-grain exterior, illuminated light band, and the included remote control. The diffuser has physical buttons for 'Light' and 'Mist' with timer options (1H, 3H, 6H, ON) visible on its base. The remote control displays buttons for power, mist modes, timing, mist intensity, and light control.
3.1 Diffuser Unit Controls
- LIGHT Button: Press to turn on the LED light. Cycle through 14 colors (7 colors with 2 modes: fixed or cycling). Press and hold to turn off the light.
- MIST Button: Press to turn on the mist. Cycle through timer settings: 1H, 3H, 6H, ON (continuous mist). Press and hold to turn off the mist.
3.2 Remote Control Functions
The remote control allows convenient operation from a distance of up to 15 feet.
- ON/OFF: Powers the diffuser on or off.
- Intermittent: Sets the mist to intermittent mode (e.g., 30 seconds on, 30 seconds off).
- Continuous: Sets the mist to continuous mode.
- Timing: Cycles through timer settings (1H, 3H, 6H, ON).
- Big/Small: Adjusts mist output intensity (Low/High).
- Light: Controls the LED light functions (on/off, color cycling, fixed color).
4. Setup Instructions
- Placement: Place the diffuser on a flat, stable surface. Ensure it is away from direct sunlight, heat sources, and electronic devices.
- Remove Lid: Gently remove the top cover of the diffuser.
- Connect Power: Connect the power adapter to the DC jack at the bottom of the diffuser. Do not plug into a wall outlet yet.
- Fill Water Tank: Using clean tap water, fill the water tank up to the maximum water level line (500ml capacity). Do not overfill.
- Add Essential Oils: Add 3-5 drops of your preferred essential oil directly into the water tank. Adjust the quantity based on personal preference and room size.
- Replace Lid: Carefully place the top cover back onto the diffuser, ensuring it is securely seated.
- Plug In: Plug the power adapter into a standard wall outlet. The diffuser is now ready for operation.
5. Operating Instructions
5.1 Mist Control
- To Turn On Mist: Press the MIST button on the diffuser or the ON/OFF button on the remote. The diffuser will start in continuous mist mode.
- To Set Timer: Press the MIST button repeatedly to cycle through timer settings: 1 hour, 3 hours, 6 hours, or ON (continuous mist). The corresponding indicator light will illuminate.
- To Adjust Mist Intensity: Use the Big/Small button on the remote control to switch between low mist (30ml/h) and high mist (60ml/h) output.
- To Turn Off Mist: Press and hold the MIST button for 2 seconds, or press the ON/OFF button on the remote.
5.2 Light Control
- To Turn On Light: Press the LIGHT button on the diffuser or the Light button on the remote. The light will turn on and cycle through colors.
- To Fix a Color: While the light is cycling, press the LIGHT button again to fix the current color.
- To Cycle Colors: Press the LIGHT button again to cycle through the 7 available colors. Each color has a bright and dim mode, totaling 14 light options.
- To Turn Off Light: Press and hold the LIGHT button for 2 seconds, or press the Light button on the remote until the light turns off.
5.3 Auto Shut-Off Feature
The diffuser is equipped with an auto shut-off function. When the water level is too low or the water runs out, the diffuser will automatically power off to prevent damage and ensure safety.
6. Maintenance
Regular cleaning is essential for optimal performance and longevity of your diffuser. Clean the diffuser after every 5-6 uses or every 3-5 days.
- Disconnect Power: Always unplug the diffuser from the power outlet before cleaning.
- Empty Water: Remove the lid and carefully pour out any remaining water from the drainage side of the tank (opposite the air outlet) to avoid water entering the air outlet.
- Wipe Tank: Use a soft cloth or cotton swab to wipe the inside of the water tank. For stubborn residue, use a small amount of mild dish soap diluted with water, then rinse thoroughly.
- Clean Ultrasonic Plate: Gently wipe the ultrasonic vibration plate (the small ceramic disc at the bottom of the tank) with a cotton swab dipped in white vinegar. Do not scrub or use abrasive materials, as this can damage the plate.
- Dry Thoroughly: Allow all parts to air dry completely before reassembling or storing the diffuser.
- Avoid Chemicals: Do not use corrosive detergents or solvents, as they may damage the diffuser.
7. Troubleshooting
If you encounter issues with your diffuser, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or weak mist | Insufficient water; Ultrasonic plate dirty; Air outlet blocked; Overfilled water tank. | Add water to the correct level; Clean the ultrasonic plate; Ensure air outlet is clear; Do not exceed MAX line. |
| No power | Power adapter not connected; No power from outlet. | Ensure adapter is securely plugged in; Test outlet with another device. |
| Remote control not working | Remote battery low/dead; Obstruction between remote and diffuser; Remote too far. | Replace remote battery; Ensure clear line of sight; Operate within 15ft range. |
| Water leakage | Lid not properly secured; Water overfilled; Diffuser tilted. | Ensure lid is tightly closed; Do not overfill; Place on a flat, stable surface. |
| Unusual noise | Water level too low; Foreign object in water tank. | Add water; Remove any foreign objects. |
8. Specifications
| Brand | HJTHJT |
| Model Name | WPD1 |
| Capacity | 500 ML |
| Product Dimensions | 6"L x 6"W x 7"H |
| Material | Plastic |
| Mist Modes | Low (30ml/h), High (60ml/h) |
| LED Lights | 14 Colors (7 colors x 2 modes: fixed/cycling) |
| Noise Level | <25dB |
| Auto Shut-off | Yes (when waterless) |
| Remote Control Range | Up to 15 feet |
| Item Weight | 1.39 pounds (0.63 Kilograms) |
| UPC | 757911312394 |
9. Warranty and Support
For any questions, technical support, or warranty inquiries regarding your HJTHJT 500ML Essential Oil Diffuser WPD1, please contact the manufacturer or your retailer. Keep your purchase receipt as proof of purchase for warranty claims.