Xiaomi Smartmi Air Humidifier 2: Complete Instructions for Configuration and Control

The Xiaomi Smartmi Air Humidifier 2 is not just a household appliance, but a full-fledged smart home device that automatically maintains optimal indoor humidity. Unlike the classic models, it integrates into the Mi Home ecosystem, allows you to manage yourself through a smartphone and even works on a schedule. However, many users face difficulties already at the first connection stage: the device is not online, the application gives an error, it is unclear how to set up an automatic mode.

In this article, we’ll look at all the steps of settings, from unpacking and connecting to Wi-Fi to fine calibrating sensors and integrating with voice assistants, and focus on the hidden features that the manufacturer doesn’t advertise: for example, how to reset the device to factory settings without the reset button, or why the humidifier can suddenly turn off when working with branded cartridges. If you just bought Smartmi Air Humidifier 2 or have been using it for a long time, but want to unleash its potential 100% – this guide is for you.

1. Preparation of the humidifier for the first run

There are a few steps that you need to take before you plug the device into the outlet, and neglecting them can cause the sensors to malfunction or even break the pump, starting with unpacking and checking the equipment.

In the box with Xiaomi Smartmi Air Humidifier 2 should be:

• 📦 The humidifier itself with a lid and a water tank (5.5 liters)
• 🔌 Power adapter (220V, 24W) cabled
• 💧 Water softening cartridge (installed inside the tank)
• 📄 Short instructions in Chinese/English
• 🔧 Warranty card (if purchased in the official store)

The first thing you need to do is flush the tank, and even though it's new, there may be microplastics or grease in the tank, and you can only use running water without detergents, and you can also check if the cartridge is tightly installed, and it has to sit without backlash, otherwise the water will flow past the filter.

⚠️ Warning: Do not turn on the humidifier without water in the tank. Even 10 seconds of dry operation can disable an ultrasonic membrane module, which costs half the price of the device.

After you flush, pour water to the maximum mark (not higher!) and set the tank on the base. Make sure the contacts at the bottom of the tank match the connectors at the base, which ensures that the water level sensor is activated correctly. You can now plug in the power adapter.

2. Connect to the Mi Home application: step-by-step instructions

Smartmi Air Humidifier 2 is managed via the official Mi Home app (or Xiaomi Home in newer versions). If you don’t already have an account, register by phone number or email. Importantly, for Xiaomi smart devices, be sure to link your account to the Mainland China region, otherwise some of the features will be unavailable.

Connection algorithm:

1. Open Mi Home and click "Add Device" (Icon "+" top-right).
2. Select the category "Smart Home" → "Humidifier".
3. In the list of models, find the Smartmi Air Humidifier 2 (if not, update the app).
4. Hold the power button on the humidifier body for 5 seconds until the indicator starts flashing orange.
5. In the app, confirm that the indicator is flashing and select your Wi-Fi network (2.4 GHz! only).
6. Enter the Wi-Fi password and wait until the process is complete (it can take up to 2 minutes).

If you have a “Can’t Add Device” error during the connection step, try:

• 🔄 Reboot the router (sometimes changing the Wi-Fi channel to 1-6 helps).
• 📱 Reinstall the Mi Home app (remove the cache before doing so).
• 🌍 Change your account region to “China” in your profile settings.
• 🔌 Connect the humidifier to another outlet (possibly a problem in the voltage).

Make sure the router is running on 2.4 GHz|

Turn off VPN/proxy on your phone |

Check that there are no locks on the Mi Account balance|

Install the latest version of Mi Home from the App Store/Google Play|-->

Once you've successfully connected, the device will appear in the main menu of the app, and you can now start setting up the settings.

3. Basic humidifier settings in Mi Home

The Smartmi Air Humidifier 2 management interface in the app is divided into several tabs. Let's look at each one in detail.

📊 Main screen screen

Here's the display:

• 🌡️ Current room temperature and humidity (data from built-in sensor).
• 💧 Water level in the tank (percentage).
• ⚙️ Current mode of operation (auto, manual, night).
• 🔄 On/off buttons and adjusting the intensity of the steam.

⚙️ Settings of the device

The most important parameters are:

• Target Humidity: The recommended value is 40-60%, and for children's rooms, you can increase it to 50-55%.
• Mode: Auto - automatic adjustment by the sensor. Manual - manual intensity setting (1-3 level). Sleep - night mode with minimal noise (up to 30 dB).
• Timer: allows you to program the on/off schedule.
• Indicator Light: You can turn off the lights at night.

🔄 Additional functions

In the Automation section, you can create interaction scenarios with other Xiaomi devices, for example:

• 🌬️ Turn on the humidifier when the air conditioner reduces humidity below 40%.
• 🚪 Disable the device when you open a window (if you have a door/window sensor).
• 🛌️ Activate night mode on schedule at 22:00.

💡

If the humidifier is often turned off with an error E1 (lack of water), try to slightly raise the back of the tank - sometimes the level sensor is triggered falsely due to the loose fit of the contacts.

Calibration of sensors and solution of typical problems

The Smartmi Air Humidifier 2 sensors can give inaccurate readings over time, which is manifested by the fact that the device is either not moisturizing enough (the readings are understated) or working non-stop (the readings are overstated), and you can fix this manually.

📏 Calibration of the hygrometer

To verify the accuracy of the sensor:

1. Place a reference hygrometer next to the humidifier (e.g., Xiaomi Mijia Bluetooth Temperature and Humidity Sensor).
2. Compare the readings in the Mi Home app with the reference ones.
3. If the difference is greater ±5%, reset calibration: Press and hold the power button for 10 seconds until the indicator flashes red 3 times.

⚠️ Common Errors and Their Codes

Critical feature of the model: the humidifier can falsely trigger an error E1, If you use water with a high salt content (hardness above 8 mg-eq/L), in this case, the cartridge clogs up in 2-3 weeks instead of the declared 3 months.

⚠️ Note: If after cleaning the cartridge, the device continues to issue an error E3, Don't try to disassemble the ultrasonic module yourself, it voids the warranty.

5. Optimization of work: tips for advanced users

To make the humidifier work more efficiently and longer, use these tips:

💧 Water quality

The composition of the water depends on the cartridge resource and the purity of steam:

• 🚫 Cannot be used: distilled water (accelerates corrosion of metal parts), tap water without filtration.
• ✅ The best option: bottled water with a hardness of 2-5 mg-eq / l or tap water, passed through the reverse osmosis filter.

🔋 Extension of cartridge life

Officially, the cartridge is designed for 3 months, but with proper care it can be used up to 6 months:

• 🧼 Wash the cartridge under running water every week.
• 🕒 Soak it in a solution of citric acid (1 tbsp. spoon per 1 liter of water) for 1 hour once a month.
• ☀️ Dry the cartridge outdoors (not near heating appliances!).

📱 Integration with voice assistants

Smartmi Air Humidifier 2 supports control via Alice (Yandex), Google Assistant and Siri (via HomeKit using the Xiaomi Mi Gateway 3 hub).

• "Alice, turn the humidifier on as high as possible."
• “OK Google, set the bedroom humidity to 50%.”
• "Hey Siri, turn off the humidifier in 1 hour."

6. Care and cleaning: how to avoid mold and scale

Ultrasonic humidifiers require regular cleaning, otherwise bacteria multiply in the tank and plaque forms on the membrane.

For disinfection, hydrogen peroxide of 3% can be used:

1. Pour into the tank a solution of peroxide (100 ml per 1 liter of water).
2. Turn on the device for 10 minutes.
3. Pour the solution and rinse the tank 3 times with clean water.

⚠️ Warning: Never use abrasives (such as soda powder) to clean – they scratch the ultrasonic membrane, which leads to a 30-40 decrease in steam performance%.

💡

Using hard water reduces the life of the cartridge by 2-3 times, and if the water is “hard” in your area, install an additional filter on the tap or buy bottled water.

7. Hidden functions and undocumented capabilities

The manufacturer does not advertise some of the Smartmi Air Humidifier 2 chips, but they can be useful:

🔍 The “Children's room” mode"

Activated through a non-obvious combination:

1. Turn on the device.
2. Press the power button 3 times in a row at intervals of 1 second.
3. The indicator will blink blue - now the humidifier works with a reduced intensity of steam (safe for newborns).

📊 Export of climate data

Mi Home app allows you to save the history of humidity and temperature in format CSV:

1. Go to the device settings → "Data history".
2. Click on the gear icon in the upper right corner.
3. Select "Export Data" and specify the period (up to 30 days).

🔌 Alternative nutrition

The humidifier can be powered from the powerbank with the output 5V/2A, if you use an adapter with USB It's a power connector (like an old router) that's useful for use in the country or when you're traveling.

💡

If the humidifier is making more noise than usual, check the ultrasonic membrane attachment. Often the cause is a weakened screw on the back panel (you need a screwdriver). T5).

FAQ: Answers to Frequent Questions