Introduction
Thank you for purchasing the IRIS OHYAMA AHM-H12B-H Steam Humidifier. This compact and hygienic steam humidifier is designed to provide comfortable humidity in your living space, featuring an aroma function for added relaxation. Please read this manual thoroughly before use to ensure safe and optimal performance.

The IRIS OHYAMA AHM-H12B-H Steam Humidifier, highlighting its humidification capacity, continuous operation time, tank volume, and aroma compatibility.
Key Features:
- Hygienic Steam: Water is heated to over 100°C, boiling and sterilizing it before releasing clean steam into the air. This ensures efficient and hygienic humidification throughout the room.
- High Humidification Capacity: Effectively humidifies your space, maintaining optimal humidity levels.
- Long Continuous Operation: With a 1.3L tank, it can humidify for approximately 11 hours on a single fill, providing continuous moisture from evening until morning.
- Compact and Lightweight: Weighing approximately 0.8kg (without water), it is easy to move and ideal for bedside or desktop use.
- Aroma Function: Features an aroma tray to enjoy your favorite essential oils, spreading a pleasant fragrance along with humidification. (Aroma oils are not included.)
- Simple Design: Its clean and simple design blends seamlessly with any room decor.
Setup
- Unpacking: Carefully remove the humidifier from its packaging. Retain packaging for future storage or transport.
- Placement: Place the humidifier on a flat, stable, and heat-resistant surface. Ensure it is away from walls, furniture, and electronic devices to allow for proper mist dispersion and prevent damage. Avoid placing it on carpets or absorbent surfaces.
- Filling the Water Tank:
- Ensure the unit is unplugged before filling.
- Remove the water tank from the main unit.
- Unscrew the tank cap and fill the tank with clean tap water. Do not exceed the maximum fill line.
- Securely screw the tank cap back on.
- Place the filled water tank back onto the main unit, ensuring it is seated correctly.

Illustration of how to remove and replace the water tank for refilling.
Operating Instructions
- Power Connection: Plug the power cord into a suitable electrical outlet (AC100V).
- Turning On/Off: Use the power switch located on the unit to turn the humidifier ON or OFF. The unit will begin humidifying once turned on.
- Aroma Function:
- Locate the aroma tray on the unit.
- Add a few drops of your preferred commercially available aroma oil onto the aroma pad in the tray.
- Ensure the aroma tray is properly closed. The fragrance will diffuse with the steam.
- Automatic Shut-off: The humidifier is equipped with an automatic shut-off feature. When the water tank is empty, the unit will stop operation, and the reset button lamp will turn off.
- Restarting Operation: After refilling the water tank and placing it back on the main unit, press the reset button. The lamp will illuminate, and operation will resume.

The aroma tray allows for the addition of essential oils to enhance your humidification experience.
Maintenance
Regular cleaning is essential to maintain the performance and hygiene of your humidifier. Always unplug the unit before cleaning.
Daily Care:
- Empty any remaining water from the tank and main unit.
- Wipe the exterior of the unit with a soft, damp cloth.
- Refill with fresh tap water daily.
Weekly Cleaning (or every two weeks, depending on water hardness):
- Descaling: Mineral deposits (scale) can build up in the heating element. Use a descaling solution (e.g., citric acid solution) specifically designed for humidifiers. Follow the descaling product's instructions carefully.
- Water Tank Cleaning: Clean the inside of the water tank with a soft brush and mild detergent. Rinse thoroughly to remove all soap residue.
- Aroma Tray: Clean the aroma tray and replace the aroma pad if it becomes discolored or loses effectiveness.
Storage:
When not in use for an extended period, clean the unit thoroughly, ensure all parts are dry, and store it in its original packaging in a cool, dry place.
Troubleshooting
If you encounter any issues with your humidifier, please refer to the following common problems and solutions before contacting customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or very little mist. | Water tank is empty. Unit is not properly assembled. Mineral buildup (scale) on heating element. | Refill water tank and press reset button. Ensure water tank is correctly seated. Clean the heating element as per maintenance instructions. |
| Unusual odor. | Stagnant water or dirty tank. New unit odor. | Clean the water tank and main unit thoroughly. Use fresh water daily. The odor should dissipate after a few uses. Ensure proper ventilation. |
| Unit does not turn on. | Power cord not plugged in. No power from outlet. Water tank empty (safety shut-off). | Check power cord connection. Test outlet with another appliance. Refill water tank and press reset button. |
Specifications
The following are the technical specifications for the IRIS OHYAMA AHM-H12B-H Steam Humidifier:
| Feature | Specification |
|---|---|
| Product Size (W x D x H) | Approx. 11.8 cm x 21.5 cm x 22.8 cm |
| Product Weight | Approx. 0.8 kg (without water) |
| Rated Voltage | AC100V |
| Rated Frequency | 50/60Hz |
| Rated Power Consumption | 100W |
| Humidification Capacity | Approx. 120 ml/h |
| Continuous Humidification Time | Approx. 11 hours |
| Applicable Floor Area (Wooden Japanese room) | Approx. 2 tatami mats |
| Applicable Floor Area (Prefabricated Western room) | Approx. 3 tatami mats |
| Water Tank Capacity | Approx. 1.3 L |
| Cord Length | Approx. 1.4 m |

Visual representation of the humidifier's dimensions.
Warranty and Support
This product comes with a manufacturer's warranty. For detailed information regarding warranty coverage, terms, and conditions, please refer to the warranty card included with your product or visit the official IRIS OHYAMA website. For technical support, spare parts, or service inquiries, please contact IRIS OHYAMA customer service through the contact information provided in your product documentation or on their official website.
Please retain your proof of purchase for warranty claims.





