Modern climate control systems in homes are becoming more complex, and Xiaomi’s popular air purifiers are no exception, and despite their apparent simplicity, there is a sophisticated engineering behind them that requires careful maintenance. Many owners face the need for deep cleaning or replacement components that go beyond simple change. HEPA-filter.
Regular maintenance allows you to extend the life of the electric motor and keep the efficiency of air cleaning at a high level. Dust deposited on the fan blades and the inner walls of the housing can cause increased noise and vibration. In this article, we will discuss the dismantling process in detail so that you can safely conduct a revision of the device.
It is important to understand that any disassembly of an electrical appliance carries certain risks associated with loss of warranty and the possibility of damage to fragile plastic elements. Before starting work, you need to make sure that you have basic skills in handling electronics and the appropriate tool. Xiaomi designs its devices with the expectation of minimal user intervention, so access to the insides is often hidden.
Workplace preparation and necessary tools
The first step before any technical procedure is to organize a safe and well-lit workspace. You will need a hard-surfaced desk covered with soft cloth or mat to avoid scratching the glossy plastic of the case. The lack of static electricity is a critical factor, so it is recommended to use an antistatic bracelet or just periodically touch a ground metal object.
The toolkit must be tailored to the specifics of the fasteners used by the manufacturer, most often using Torx screws with a slag that cannot be twisted with a standard cross screwdriver, and plastic blades (spooders) may also be needed to accurately open the latches without damaging the body.
Be sure to prepare the screw sorting containers, as their sizes can vary depending on the mounting unit. Losing even one small screw can cause extraneous sounds when the fan is running at high speeds. Below is a list of equipment you need:
- 🔧 Torx bit screwdriver set (T5, T6) and Phillips
- 🧤 Antistatic bracelet or gloves
- 🛠️ Plastic blades for opening the body
- 🧹 Compressed air or pear for purging
- 🧼 Isopropyl alcohol and lilac-free wipes
Remember to disconnect the device completely from the power grid and remove the power cord before starting work. Residual voltage in the capacitors can persist for some time, so after a shutdown it is worth waiting 5-10 minutes.
Dismantling the external cover and removing filters
The disassembly process begins with the removal of the outer decorative grille, which also serves as an air intake. In most models, such as the Mi Air Purifier 2, 3 or Pro, this part of the structure is removed by turning counterclockwise or snapping magnetic latches. Unless the lid is removed by light effort, do not use excessive force to avoid breaking the plastic guides.
Once the grid is removed, the main filter element is accessed. HEPA-The filter, pulling on a special tape-tongue. Pay attention to the condition of the sealing gum around the perimeter of the filter: it must be clean and elastic, ensuring the tightness of the air channel.
⚠️ Note: When removing the old filter, try not to shake it sharply so that the accumulated dust does not spread around the room.
Under the filter is the inner grille and access to the fan impeller, and this is where most of the dust is accumulated, which has not been removed by owners for years, and to access this node in some models requires unscrewing several screws hidden under decorative plugs or rubber legs of the device.
☑️ Checking before deep cleaning
Disassembly of the case and access to electronic board
Maintenance, including cleaning sensors or replacing the Wi-Fi module, will require removing the top control panel, which is usually fixed by several screws located at the bottom of the device or under the removable back cover. Use a thin plastic blade to gently tamper with the panel around the perimeter as you walk along the junction line.
Inside the case, you'll find a main circuit board connected by plumes to the display and control buttons. Be very careful with the connection cables: they're very thin and easily break when handled carelessly. Before disconnecting any plume, you need to bend the locking connector, if it's designed.
The board contains key control components, including a microcontroller and a wireless module. Dust on the contacts can cause a touch ring malfunction or connection problems to the Mi Home app. Use dry soft brush or compressed air to clean, avoiding direct contact of metal objects with electronics.
| Component | Location. | Function | Frequency of cleaning |
|---|---|---|---|
| Sensor PM2.5 | Side wall (hole) | Air quality analysis | Once in 3 months |
| Piedfish | Central mine | Circulation of air masses | Every 6 months |
| Management fee | Upper body | Data processing and logic | If necessary, |
| Motor. | Basis of the device | Fan rotation | Once a year (lubrication) |
If you're planning to replace the display or the power button, now is the time to do so.New parts for Xiaomi often come assembled with plumes, making the replacement process easier.Make sure all contacts sit tightly in their sockets before assembly.
Cleaning of engine and fan blades
The heart of the cleaner is a brushless DC motor, which has a long service life and low noise levels. However, over time, dirt can accumulate on the axles and bearings, leading to a hum or whistle when working.
Fan blades are where the most dust settles, turning into dense plaque, cleansing is best done with a wet (but not wet!) napkin and a long-pile brush, and it is important to remove contamination from all sides of the blades to keep the rotor balanced.
⚠️ Note: It is strictly forbidden to pour water or cleaning products directly onto the engine or inside the body.
If the engine is making a grind, the lubricant in the bearings may have dried up, and in this case, you can try to gently drop one drop of special bearing oil (for example, silicone) on the rotation axis. Use of ordinary engine oil or WD-40 is unacceptable, since they can destroy plastic and rubber seals.
After cleaning, be sure to let all the elements dry completely before assembly. Even a minimal amount of moisture can lead to corrosion of the contacts or mold inside the device during subsequent use.
Maintenance of air quality sensors
One of the most common causes of purifier malfunction is contamination of the PM2.5 optical particle sensor, which is located in a small hole on the side or back and is closed by a protective grille, and if the sensor is clogged with dust, the device may display incorrect data or constantly operate at maximum power.
To clean the sensor, you need to remove the side cover (if it is removable) or access the hole through the technological gaps. Blow the hole with compressed air several times with short pulses, which will dislodge the accumulated dust from the optical chamber.
In some models, the sensor can be carefully removed with tweezers if the design allows. Wipe the glass part of the sensor with a dry cotton swab. Do not use alcohol or solvents, as they can leave stains or damage the optics.
💡
If the sensor still shows high levels of contamination in a clean room after cleaning, try calibrating through the Mi Home app or leave the device to operate in Auto mode for several hours in a ventilated room.
Regularly checking the sensor is key to the entire system, and compare the readings to other instruments or visual assessments of dustiness after cleaning.
Device assembly and initial start
Assembling is done in reverse disassembly order. Carefully ensure that all the plumes are stacked in their channels and not clamped by the body. Screw the screws evenly, without undue effort, so as not to break the thread in the plastic racks.
Pay special attention to the installation of the filter and the outer cover. Make sure that the filter is flat and the latches of the cover close until the characteristic click.
Once assembled, connect the device to the network and run a test run, check all modes, spin the fan and respond to commands from the control panel, if you notice any foreign sounds, immediately turn off the device and check that the assembly is correct.
💡
Proper assembly ensures no vibrations and noise, as well as air-contour tightness, which is critical for cleaning quality.
Successful assembly and launch means maintenance has been successful, and now your cleaner is ready to deliver clean air again, working at maximum efficiency.