1. Introduction
Thank you for choosing the Medisana 40012 Air Humidifier. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your device. Please read these instructions carefully before use and keep them for future reference.
2. Important Safety Instructions
- Read all instructions before using the appliance.
- Keep the appliance out of reach of children.
- Ensure the power supply matches the voltage specified on the appliance.
- Do not immerse the appliance, power cord, or plug in water or other liquids.
- Unplug the appliance before cleaning, filling, or when not in use.
- Do not operate the appliance with a damaged cord or plug.
- Place the humidifier on a firm, flat, and water-resistant surface.
- Do not block the mist outlet.
3. Product Overview
The Medisana 40012 Air Humidifier is designed to improve air quality by adding moisture to the air. It features a user-friendly design with advanced functionalities.

Image 1: Front view of the Medisana 40012 Air Humidifier. Shows the main unit with the mist outlet and control panel.
Key Features:
- Touch Panel: Intuitive controls for easy operation.
- 23 W Power Performance: Efficient humidification.
- 360-Degree Mist Outlet: Ensures even distribution of mist.
- 3.6 Liter Water Tank: Large capacity for extended operation.
- 2-Level Mist Adjustment: Customize mist output to your preference.
- Water Level Indicator: Easily monitor the water level.
- Automatic Shut-off: For safety when the water tank is empty.
- Audible Alert System: Notifies you when the water tank needs refilling.
4. Setup
- Unpacking: Carefully remove the humidifier from its packaging. Retain the packaging for future storage or transport.
- Placement: Place the humidifier on a flat, stable, and water-resistant surface at least 15 cm away from walls and furniture. Ensure the mist outlet is not directed towards electronic devices or moisture-sensitive materials.
- Filling the Water Tank:
- Remove the water tank from the base unit.
- Unscrew the tank cap and fill the tank with clean, cool tap water. Do not use hot water or add essential oils directly into the tank.
- Securely screw the tank cap back on.
- Place the filled water tank back onto the base unit, ensuring it is seated correctly.
- Power Connection: Plug the power cord into a suitable electrical outlet.
5. Operating Instructions
- Power On/Off: Press the power button on the touch panel to turn the humidifier on or off. The indicator light will illuminate when the device is active.
- Mist Level Adjustment: Press the mist level button to cycle between the two available mist output levels (Low and High). The corresponding indicator will light up.
- Water Level Indicator: The water level indicator will show the current water level in the tank. When the water level is low, the device will emit an audible alert and automatically shut off for safety. Refill the tank to resume operation.
- 360-Degree Mist Outlet: Rotate the mist outlet nozzle to direct the mist in any desired direction.
6. Maintenance and Cleaning
Regular cleaning is crucial for maintaining the efficiency and longevity of your humidifier and preventing the growth of bacteria and mold.
Daily Maintenance:
- Empty and rinse the water tank and base unit with fresh water.
- Wipe all surfaces dry with a clean cloth.
Weekly Cleaning:
- Unplug the humidifier and remove the water tank.
- Descaling the Water Tank: Fill the water tank with a solution of 1 part white vinegar and 1 part water. Let it sit for 30 minutes, then rinse thoroughly.
- Cleaning the Base Unit: Pour a small amount of the vinegar solution into the base unit and let it sit for 30 minutes. Gently scrub any mineral deposits with a soft brush or cloth. Do not immerse the base unit in water.
- Rinse all components thoroughly with clean water until the vinegar smell is gone.
- Wipe all parts dry before reassembling.
7. Troubleshooting
If you encounter any issues with your Medisana 40012 Air Humidifier, please refer to the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist output | No water in tank; Power not connected; Mist outlet blocked; Mineral buildup. | Refill water tank; Check power connection; Clear mist outlet; Clean the unit. |
| Unusual odor | Stagnant water; Dirty water tank/base. | Empty and clean the water tank and base unit thoroughly. Use fresh water. |
| Water leakage | Water tank cap not secured; Tank not seated correctly; Unit on uneven surface. | Ensure tank cap is tight; Re-seat the water tank; Place unit on a flat surface. |
| Loud noise during operation | Unit on uneven surface; Water level too low. | Place unit on a flat surface; Refill water tank. |
8. Technical Specifications
| Feature | Specification |
|---|---|
| Brand | Medisana |
| Model Number | 4015588400124 (also known as 40012) |
| Power | 23 W |
| Water Tank Capacity | 3.6 Liters |
| Material | Plastic |
| Operating Mode | Evaporator |
| Run Time | Up to 10 hours |
| Approximate Package Dimensions | 45 x 45 x 45 cm |
| Approximate Package Weight | 4 Kilograms |
9. Warranty and Customer Support
Medisana products are manufactured to high-quality standards. This product is covered by a manufacturer's warranty in accordance with the legal provisions of your country of purchase. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Medisana website.
For technical support, spare parts, or any questions regarding your Medisana 40012 Air Humidifier, please contact Medisana customer service. Contact details can typically be found on the official Medisana website or in the product packaging.





