How to disassemble the air purifier Xiaomi: instructions with nuances for all models

Xiaomi air purifiers have long been the standard of quality in the smart home segment. Their compact design, high filtration efficiency and integration with the Mi Home ecosystem attract millions of users. However, even the most reliable device requires maintenance: replacing filters, cleaning the fan or fixing malfunctions sooner or later become necessary. Many owners are afraid to disassemble the device themselves, fearing breaking fragile plastic latches or breaking the tightness. This article will help avoid typical errors and conduct disassembly without risking the warranty (if it has already expired) or the device’s performance.

We will discuss the process in detail on the example of popular models - Mi Air Purifier 2/2S/3/3H/4/4 Lite/Pro, We'll tell you the key differences between them, and we'll give you tips on how to diagnose breakdowns before you open the case, and if you've never held a screwdriver, don't worry, most of the work is done without tools, only with your hands.

⚠️ Important: If your cleaner is warranty-free, disassembly of the case automatically cancels it. Xiaomi official service centers in 90% of cases refuse free repairs after self-intervention. Check the warranty period in the Mi Home application (Device) → Settings → Information before work commences.

Preparation for disassembly: tools and security measures

Before you start dismantling, make sure you have everything you need. Most Xiaomi models are disassembled without specialized tools, but some operations will require care.

• 🔧 Plastic blade or mediator - to disconnect the latches of the body (metal screwdrivers can leave scratches).
• 🧴 Isopropyl alcohol (70%+) or wet wipes – to clean contacts and internal surfaces.
• 📸 Smartphone with camera – to capture the location of parts and wires before disconnection.
• 🧲 Magnetic mat or container - for storing small screws and fasteners (in some models, up to 15 pieces!).

Also prepare your workspace: a flat surface covered with soft cloth (like a towel) so as not to scratch the case. If you are disassembling a filter cleaning device, buy a new one in advance - the original Xiaomi filters have a life of 6-12 months depending on the model. Fakes often do not provide the claimed degree of filtering. HEPA H13 They can release harmful substances when heated.

⚠️ Warning: Never disassemble a cleaner right after work! Let it cool for at least 30 minutes - heated plastic parts become brittle and can crack under pressure. This is especially true for models with air heating function (Mi Air Purifier 4 Pro).

Removal of the upper cover and access to the filter

To start with, the simplest is filter removal, which is located under the top cover of most Xiaomi models, which is mounted on magnetic or plastic latches, and the process is different for different generations of devices:

For Mi Air Purifier 2/2S/3/3H:

1. Disconnect the device from the network and turn it upside down (it is more convenient to press on the latches).
2. Find two plastic clips on the sides of the lid – they are arranged symmetrically, approximately at the level of the middle of the case.
3. Carefully press them simultaneously inside (to the center of the device) and pull the lid up.

For Mi Air Purifier 4/4 Lite/Pro:

• The cover is fixed by magnetic latches - it is enough to pull it up with effort ~5 kg (don't be afraid, it won't break!).
• If the cover fails, check if the air quality sensor is blocking it (in models with a display on the top panel).

After removing the cover, you will see a cylindrical filter (in models). 2/3 generation or flat filter with carbon layer (in 4 Note the installation date markings, which can be read through the Mi Home app or on the filter itself (sticker with the following page). QR-If the filter is covered with a dust layer thicker than 2 mm, it must be replaced - washing with water will not restore filtering properties HEPA.

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If the filter looks clean but the cleaner works worse, check the perimeter density of the sealing gum. Over time, it deforms, allowing unfiltered air to pass through. Gum can be bought separately (the article depends on the model).

Dismantling the front panel and access to electronics

If you need to get to a fan, sensors or a control board, you need to remove the front panel, and here the main differences between the models begin:

Mi Air Purifier 2/2S:

• The panel is mounted on 4 screws under the cross screwdriver (size) PH1). They are hidden under legs-stands - carefully tuck them with a plastic spatula.
• After the screws are twisted, the panel will be removed by moving on itself (from top to bottom).

Mi Air Purifier 3/3H/4/Pro:

• This uses perimeter latches. Start at the bottom of the panel, insert the blade into the slot, and carefully guide it around, snapping the mounts.
• In models with a touch screen (Mi Air Purifier 4 Pro), the panel is connected to the board with a plume - do not pull it sharply so as not to tear off the contacts!

After removing the panel, you will have access to:

• 🌀 Fan (the main source of noise when working).
• 📡 Sensor. PM2.5/TVOC (It is often contaminated and requires cleaning with alcohol).
• 🔌 Control board with microcontroller and Wi-Fi module.

⚠️ Note: In the Mi Air Purifier Pro, the control board is vertically mounted and attached to the radiator. When disassembling, do not touch the radiator with your bare hands - it can be electrified (even after disconnecting from the grid). Use rubber gloves or tools with isolated handles.

Cleaning the fan and eliminating noise

One of the most common causes of disassembly is noise during operation, which is caused 80% of the time by dust on the fan blades or wear on the engine bearings.

Step 1: Inspection of the blades:

• Scroll the fan with your hand - it should rotate smoothly, without jamming.
• If you hear a crunch or a creak, it means that the dust has got into the bearings. WD-40 or special lubricant for electric motors.

Step 2. Clean up:

• Remove dust from the blades with a soft brush (an old toothbrush will fit).
• To remove fatty deposits, use cotton swabs dipped in isopropyl alcohol.
• Do not use water or household chemicals – they can damage plastic or cause corrosion of metal parts.

Step 3. Balancing:

If there is vibration at high revs after cleaning, check the balancing of the blades:

1. Remove the fan from the shaft (usually it is attached with a single screw or locking ring).
2. Place it on a flat surface – if one of the blades touches the table, it is deformed.
3. Carefully bend the blade with a plastic tool (not metal!) until aligned.

Critical information: In the Mi Air Purifier 4 Pro, the fan has a Hall dacha to control the revs. When disassembling, do not touch its magnetic ring - this can confuse calibration and cause an error E1 (engine error) on next actuation.

Diagnostics and repair of management board

If the cleaner does not turn on, does not respond to buttons or gives errors (E1, E3, E4), The problem may be in the electronics. Before you bring the device to the service, try the following steps:

Power check:

• 🔌 Make sure the power cable is working – try another power supply (in Mi Air Purifier models) 2/3 plug-in DC 5.5x2.1mm, tension 12V/1.5A).
• Call the multimeter fuse on the board (located next to the power connector). ~Om.

Inspection of the charge:

• 🔍 Look for swollen capacitors (especially near a transformer).
• Check the soldering of the chip legs - often microcracks form from vibration.
• Clean the contacts with a pencil eraser (removes oxides) or alcohol.

Error reset:

Many errors (for example, E3 — Sensor problem can be reset by software:

1. Disconnect the device from the network.
2. Press the power button for 10 seconds.
3. Connect the power without releasing the button and hold it for another 5 seconds.

⚠️ Warning: If the board shows signs of burn or darkening, do not turn on the device! This is a sign of a short circuit that may damage other components. In such cases, a replacement of the board is required (the article depends on the model, for example, for the Mi Air Purifier). 3H — DJT11CM).

Building a device: how to avoid errors

Putting Xiaomi’s air purifier back together is often harder than disassembling, and here are the key points to look out for:

Procedure for connecting the plumes:

• 📶 First connect the display plume (if any), then the sensors.
• Make sure the connectors are fixed before clicking (the 4th generation models use locks).

Sealing gums:

• 🧽 Before installing the filter, check that the sealing gum lies flat, without cracks.
• In the Pro models there is an additional seal around the engine - it must be lubricated with silicone lubricant for tightness.

Post-assembly test:

1. Connect the device to the network and start it at minimum speed.
2. Check if there are any noises or vibrations.
3. In the Mi Home app, perform Sensor Calibration (Settings) → Additionally).

⚠️ Note: If after assembly the cleaner issues an error E0 (engine failure, you probably misconnected the tachogenerator plume (small white plug on the board).Switch off the power and check the polarity of the connection - there is a mark on the connector + and –.

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Always take pictures of the location of the parts before turning them off! This will save hours on diagnosing problems after assembly.

When the disassembly will not help: signs of serious breakdowns

Not all faults can be fixed by yourself, but here are the cases when you should contact the service center:

• ⚡ The device does not turn on, but the power supply is serviceable (checked by a multimeter).
• 🔥 There is a smell of burning during work - a sign of a short circuit.
• 🌡️ Overheating of the body (more than 60)°C) even at low speeds.
• 📉 Decrease in performance by more than 30% after cleaning (checked by an anemometer).

The cost of repair in official service centers Xiaomi starts from 2000 rubles. (filter replacement or cleaning) and comes to 8000 rubles. (replacement of board or engine). If your device is older than 3 years, sometimes it is more profitable to buy a new one - for example, Mi Air Purifier 4 Lite costs about 10 000 rubles., and its filters are cheaper than the Pro models.

Before the service visit:

1. Backup settings through Mi Home (if the device is still turned on).
2. Check with the manager whether your data will be saved after the repair (in 60% of cases, when changing the fee, a re-binding of the device is required).
3. If the cleaner is warranty, take checks and a box with you - without them, you can refuse free service.

FAQ: Frequent questions about dismantling Xiaomi cleaners