Xiaomi air purifiers are one of the most popular devices for maintaining a healthy microclimate in the house. Over time, any filter will get clogged with dust, and the fan can begin to make noise due to accumulated dirt. Disassembling a cleaner is a necessary procedure for deep cleaning or repair, but it must be approached with caution. HEPA-filter, which is described in the official instructions, complete disassembly of the body requires accuracy and knowledge of the design.
Many users are afraid of damaging plastic latches or breaking the seal of the device. Indeed, Mi Air Purifier (especially models) 2/3/4 And Pros have fragile mounts, but with the right approach, even a beginner can disassemble them. This article provides step-by-step analysis with the nuances of different versions, tool tips and unique recommendations for avoiding typical errors that can lead to sensors or fans breaking.
If you've never done a household appliance, start with a simple one: removing the top cover and cleaning the fan blades. Deep disassembly (like changing the motor or the control board) requires a screwdriver, plastic blades and patience. The main rule is not to apply force where parts do not lend themselves: most likely, you missed a hidden latch or screw.
Preparation for disassembly: tools and security measures
Before you start, make sure that the device is disconnected from the network in at least 10 minutes - this is necessary to discharge the capacitors in the power supply. Even when turned off, the circuit board can remain a voltage that can damage sensitive electronics.
You'll need:
- 🔧 Cross screwdriver (usually suitable size) PH1 or PH2). The Pro models may also require Torx. T5/T6.
- 📱 Plastic blades (mediators or special tools for disassembling smartphones) - they will help to gently separate the latches without damaging the body.
- 🧴 Isopropyl alcohol (70%+) Cotton swabs to clean contacts and sensors.
- 📸 Smartphone for photography – fix the location of wires and parts before disconnecting.
Work on a soft surface (such as a towel) to avoid scratching the body. If you disassemble the cleaning device, prepare a vacuum cleaner with a narrow nozzle in advance to help remove dust from hard-to-reach places.
⚠️ Warning: Do not use metal tools to separate plastic parts! even a small scratch on the body can break the tightness and cause dust to enter after assembly.
Disassembly of the top panel and removal of the fan
So, the simplest thing to do is to dismantle the top cover, where the control buttons and the display are located. 2/3/4) it's attached to 4-6 And then we put plastic latches around the perimeter, and we take it off:
- Place the cleaner on a flat surface with the buttons up.
- Carefully insert the plastic blade into the gap between the top and bottom of the case (start at the corner next to the power button).
- Smoothly drive the shoulder blade along the seam, alternately snapping the mounts, and you'll hear the characteristic clicks.
- When you disconnect all the latches, lift the lid, and it's connected to the body by a display plume. Don't pull it too hard.
Under the lid, you'll see a fan with blades to take it off.
- Unscrew the central screw (usually under the cross screwdriver).
- Carefully pull the fan upwards - it can sit on the shaft of the motor tight enough.
- Clean the blades of dust with a soft brush or vacuum. Do not use wet wipes!
Photograph the location of the display plume|
Disconnect the plume from the fee (if a complete dismantling is required)|
Check the integrity of the fan blades|
Clean the engine shaft of dirt-->
In the Mi Air Purifier Pro, the fan can be attached with additional perimeter screws, which are easy to miss, so carefully inspect the body after removing the top cover.
Dismantling filters and internal components
Once the fan is removed, you can start removing the filters and accessing the internal parts. Most Xiaomi devices have filters attached to guides and do not require any tools to remove them, but for deep cleaning or repair, you will need to disassemble the case further.
Algorithm of action:
- 🔄 Remove the front panel (where the air intake is located). It is usually attached to the front panel. 2-4 In the Pro models, you may need to unscrew. 2 screw.
- 🧩 Extract. HEPA-filter and carbon filter (if any) Note the air direction markings - when you re-install the filters must be properly installed!
- 🔧 Unscrew the screws holding the lower part of the body (usually) 4-6 In some models, they are hidden under rubber legs.
- 📶 Disconnect sensor plumes (PM2.5, temperature, humidity, from the main board. Do this carefully, holding on to the plastic connectors, not the wires!
Under the filters, you'll find a control board, a fan motor and sensors. If you want to clean, just walk with a vacuum cleaner and a wet wipe (no bigotry!) on the inside surfaces. Repairs (like changing the motor) will require a complete disassembly.
⚠️ Note: In models with laser sensor PM2.5 (For example, Mi Air Purifier 3H) You can't touch his lens with your fingers or hard objects, even micro-scratches can lead to incorrect readings!
How to check the performance of the sensor PM2.5 post-disassembly?
Disassembly of control board and motor
This is the only step you need to do to repair the electronics or replace the motor, and if you've never worked with a soldering iron, you'd better leave that part to the professionals, because the risk of damage to the board is high.
To get to electronics:
- Unscrew the screws that attach the board to the body (usually) 3-4 stuff).
- Carefully unplug all the plumes and connectors. Remember their location - entangled contacts can burn the board!
- Remove the board and inspect it for swollen capacitors, burnt tracks or oxidized contacts.
To replace the engine:
- Unscrew the fasteners (usually 4 pieces).
- Disconnect the power wires (take a picture of their location!).
- Remove the motor from the shaft. In some models, the shaft can be fixed with a locking ring, which must be removed by pliers.
When assembly, make sure that the motor shaft rotates freely - if it jams, the device will overheat. It is not recommended to lubricate the shaft (except for special silicone lubricants for electric motors).
| Component | Typical malfunctions | Renovation method |
|---|---|---|
| Management fee | Not turned on, all indicators flash, error "E1" | Power check, capacitor replacement, firmware |
| Fan engine | Noise, vibration, no spinning. | Cleaning, bearing replacement, motor replacement |
| Sensor PM2.5 | Overstated readings, error "---" | Cleaning the lens, replacing the sensor |
| Power supply | It doesn't give tension, it warms. | Replacement of capacitors, replacement of the block |
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If the cleaner doesn't turn on after assembly, check the fuse on the board (usually located next to the power connector), and in 30% of cases, the problem is solved by replacing it with a similar one with the same nominal value.
Cleaning and maintenance of internal parts
Even if you’ve disassembled the device for deep cleaning, there are a few critical points that are often overlooked:
✅ What can be cleaned:
- 🧹 Fan blades, soft brush or vacuum cleaner. For persistent contaminants, use a cotton swab soaked in isopropyl alcohol.
- 🔍 Sensors, dry cotton swabs, no moisture or aggressive solvents.
- 🔋 Contacts of the board - alcohol and eraser (for removal of oxidation).
❌ What can't be done:
- 🚫 Washing the case under running water - it will violate the tightness.
- 🚫 Use abrasives (such as hard brushes) – they scratch the plastic.
- 🚫 Blow the insides with a compressor – a strong airflow can damage sensors.
Pay special attention to ducts, which accumulate most of the dust. Mi Air Purifier 4 and Pro models have an additional pre-filter (grid in front of the air). HEPA), which also needs to be washed under warm water and dried.
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After cleaning, let all the parts dry completely during the 12-24 The humidity inside the body can lead to short circuits!
Assembly of air purifier: step-by-step instructions
You need to assemble the device in reverse order, but there are several nuances that will help to avoid errors:
Filters installation:
- Make sure that HEPA-The filter is arrowed upwards (direction of air).
- In models with a carbon filter, check that it fits tightly to the HEPA — The gaps will reduce the efficiency of cleaning.
Connection of the plumes:
The display and sensor plume must enter the connector before the click, and if the contact is not dense, the screen may flash or not work.
- In the Mi Air Purifier Pro, the plume of the humidity sensor is often flipped over – this leads to an error "E2".
Top cover attachment:
Start by clicking the opposite angle from the buttons, then gradually click the other sides.
If the lid does not sit tightly, check if the plume or wires interfere.
After assembly, turn the cleaner on to the network and run the test:
- Press and hold the power button for 3 seconds – the device should restart.
- Check the sensor readings (they should be updated every time). 5-10 seconds).
- Turn on the maximum fan speed and listen - there should be no extraneous noises or vibrations.
⚠️ Note: If after assembly the cleaner issues an error "E1" (engine problem) or "E3" (problem with the sensor, immediately disconnect it from the network and check the correct connection of plumes and contacts!
Common Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes when disassembling Xiaomi cleaners, and here are the most common ones and ways to prevent them:
🔹 Broken hull latches
Cause: Use of metal tools or excessive effort.
- Solution: Warm up plastic with a hair dryer (temperature) 50-60°C) - it will become more elastic.
🔹 Damaged display plume
- Reason: Abrupt pulling of the lid without disconnecting the plume.
- Solution: Replace the plume (article for Mi Air Purifier 3 — MDY-11-EMN40).
🔹 Incorrect sensor readings PM2.5
Reason: Touching the sensor lens or getting dust inside.
- Solution: Carefully blow the sensor with compressed air (from the can) from a distance of 10 cm.
🔹 Mistake "E4" post-assembly
Reason: Incorrect installation of filters or lack of sealing gum.
Solution: Reset the filters, check the leakage.
If you encounter an error that is not in the official instructions, try resetting the device to the factory settings:
1. Disconnect the cleaner from the network.
2. Press the power button and hold it.
3. Connect the power without releasing the button for 10 seconds.
4. Release the button - the device will reset.