How to Disassemble Xiaomi Purifier Air Purifier 3H: full-length guide

Xiaomi Mi Air Purifier Air Purifier 3H — It's a popular device for dealing with dust, allergens and bad smells, but even the most reliable technology requires maintenance: changing filters, cleaning the fan or diagnosing malfunctions. Disassembling the body is the first step in any repair, but the manufacturer does not always provide detailed instructions. In this article, we will discuss the process of disassembling without damaging the latches and mounts, point out the hidden nuances and warn against typical errors.

It is important to understand that Purifier 3H different from previous models (for example, 2S Or Pro) the design of the body and the way the internals are fixed, and there are no classic screws, just plastic latches and magnetic mounts that are easy to break if you're not handling it carefully. HEPA-filter, carbon filter or clean the turbine, this guide will help to avoid breakdowns and save on the service center.

We warn you in advance that disassembling the device will void the Xiaomi warranty if it is still valid. If your cleaner is warranty, you should contact an authorized service. For everyone else, we will proceed to a detailed analysis.

Preparation for disassembly: tools and security measures

Before you take on the screwdriver, prepare the workplace and the necessary tools. - Xiaomi Purifier 3H has fragile plastic elements, so it is important to eliminate the risk of falling or mechanical damage.

You'll need:

• 🔧 Plastic blade (or mediator) - to disconnect latches without scratches.
• 🔩 Cross screwdriver (size) PH0 or PH1) — screw-hole.
• 🧲 Magnetic mat or bowl – so as not to lose small details.
• 📸 Smartphone - for photographing the dismantling stages (useful when assembly).
• 🧴 Isopropyl alcohol (70%+) - for cleaning contacts, if required.

Also consider the safety measures:

• ⚡ Disconnect the cleaner from the network 10-15 minutes before disassembly – capacitors can retain charge.
• 👓 Work with safety glasses – dust from filters can get into the eyes.
• 🧤 Use gloves if you have sensitive skin – there may be sharp edges inside the case.

⚠️ Warning: Do not disassemble the cleaner in a wet room (for example, in the bathroom after shower). Condensation on boards can cause short circuit the next time you turn on.

Removing the top cover and accessing filters

So, let's start with the simplest thing, which is to remove the top panel, which is the filters that are hiding under it. 3H The lid is attached to magnetic latches, but many users mistakenly try to move it sideways or lift it by force, which leads to cracks in the plastic.

The correct algorithm:

1. Put the cleaner on a flat surface (better on the table).
2. Take the cover with both hands on the sides (not the front panel!).
3. Pull the lid upwards with uniform force. The magnets must detach without resistance.
4. If the lid fails, check if the latch on the back wall is blocking it (sometimes it jams due to dust).

Under the cover you will see two filters:

• 🟢 Pre-filter (net) - traps large dust and wool.
• 🟣 Combined filter (HEPA + coal) - the main cleaning element.

To extract the filters:

1. Click on the plastic latch at the top of the combined filter and pull it over yourself.
2. The pre-filter is removed by simply pulling upwards (it is not fixed by latches).

⚠️ Warning: Don't try to wash HEPA-It destroys the structure of the filter, and at the most, it's a clean vacuum cleaner at the lowest power.

Disassembly of the body: removal of the front and rear panels

If you need to get to a fan, control board or sensors, you'll have to disassemble the case. 3H It consists of three main parts:

• Front panel (with display and touch buttons).
• Rear panel (with air intake grilles).
• Base (with motor and turbine).

Let's start with the front panel:

1. Turn the cleaner down on a soft surface (towel or foam).
2. Insert the plastic blade into the gap between the front panel and the base on the right side (from the power button side).
3. Carefully lead the blade along the seam, alternately snapping the mounts (there are 6 pieces: 3 on the right and 3 on the left).
4. When all the latches are disconnected, remove the panel by pulling it on yourself.

Now back panel:

1. Turn the cleaner back and put it on the base.
2. There are two hidden screws under rubber plugs (in the lower corners) on the back.Remove the plugs and unscrew the screws.
3. Insert the blade in the upper part of the rear panel and gently move it up - the panel is attached to 4 latches.

Once you remove the panels, you'll have access to the insides of the device, and be careful, because inside you have sensor wires and a display plume that's easily damaged.

Dismantling of the fan and turbine

The fan (turbine) is the loudest and most energy-intensive component of the cleaner, and its disassembly may be required to clean the blades from dust or replace bearings. 3H turbine is attached to the base on four screws and connected to the control board three-pin connector.

Procedure:

1. Disconnect the display plume from the board (carefully pull the black tongue of the connector).
2. Unscrew the 4 screws that fix the turbine (they are located at the corners of the metal frame).
3. Turn off the feeding fan connector (white connector with three wires: red, black, yellow).
4. Lift the turbine upwards, it should come out effortlessly.

Use a soft brush and dry cloth to clean the blades. Do not use water or aggressive detergents - this can disrupt the balance of the fan and cause vibrations when working.

If the turbine makes a noise (squeaking, humming), the problem may be the bearings.

• 🛠️ Lubricate bearings with silicone lubricant (do not use it) WD-40!).
• 🔄 Check the backshaft - if it is too large, the turbine will have to be replaced.

💡

If the turbine is still noisy after cleaning, try turning the cleaner upside down and turning it on at maximum power for 1-2 minutes, which sometimes helps to shake off the dust from the bearings.

Working with control boards and sensors

Management fee at Purifier 3H It's responsible for processing sensor signals, controlling the fan and communicating with the Mi Home app. It's located under the front panel and mounted on two screws. Be sure to discharge static electricity before you touch the board (touch the grounded object).

To charge:

1. Disconnect all connectors: Display plume (black, 10-pin). Sensor connector PM2.5 (white-coloured, 4-pin). Temperature/humidity sensor connector (gray, 3-pin). Power board (red/black wire).

Unscrew two screws fixing the fee.

Carefully raise the fee for the edges - it can "stick" to the heat paste on the radiator.

Typical problems with fees:

• 🔥 Bloated capacitors are a sign of voltage surges. Replacement is required.
• 🕳️ Oxidized contacts - cleaned with alcohol and brush.
• 📡 Wi-Fi module problems – checked by a tester for a chain break.

If the cleaner doesn’t respond to buttons or connects to Mi Home, try resetting:

1. Hold the power button for 10 seconds until the beep.
2. Disconnect the device from the network for 1 minute, then turn it on again.

⚠️ Note: When soldering components on the board, use a soldering iron with a power of no more than 30 W and a temperature of up to 300°C. Overheating can damage the chips.

💡

Before disconnecting the display plume, take a picture of its position - an incorrect connection during assembly can disable the screen.

Cleaning and maintenance of internal components

After disassembly, it is recommended to clean all available components completely. Dust and dirt not only impair performance, but can also cause overheating or short circuit.

What and how to clean:

• 🌀 Turbine: Remove dust from the blades with a soft brush or vacuum cleaner.Rin the shaft and bearings with dry cloth.
• 📟 Sensor. PM2.5: Blow the dust off the sensor grille with a spray of compressed air. Don't touch the sensor with your hands.
• 🖥️ Control fee: Clean contacts with isopropyl alcohol (70%+). Blow the radiator with compressed air to remove dust.
• 🏗️ Body and ducts: Wipe the interior walls with a damp cloth (no detergents). Make sure there are no foreign objects (hair, thread) in the ducts).

Disinfection of internal surfaces can be done with an ultraviolet lamp (10-15 minutes) or chlorhexidine (wipe with a cloth soaked in solution), especially if the cleaner is used in a room with mold or viruses.

After cleaning, allow all components to dry completely (at least 1 hour) before assembly.

Cleaner assembly: order and inspection

Assembling Xiaomi Purifier 3H It should be in reverse order, but taking into account several nuances:

1. Make sure all connectors are tightly connected – loose contact can cause errors in operation.
2. When installing the turbine, make sure that the wires do not fall under the blades.
3. Twisting the screws cross-cross to avoid skewing the body.
4. Before final assembly, turn on the cleaner without the top cover and check the fan at all speeds.

Typical errors in assembly:

• ❌ Clutched wires - can cause a chain break.
• ❌ Latch mismatch - leads to backlash of the body and extraneous noise.
• ❌ Forgotten filter – the cleaner will work, but the efficiency will fall by 2-3 times.

After assembly, perform a test check:

1. Turn on the cleaner and check the response to the touch buttons.
2. Make sure the display shows the current level. PM2.5 (if the sensor is in good condition).
3. Try connecting to the device via Mi Home – check the data sync.

⚠️ Warning: If the cleaner whistles at high speeds after assembly, it's likely that the turbine is incorrectly installed or the blades are damaged.

FAQ: Frequent questions about the dismantling of Xiaomi Purifier 3H