The efficiency of the HVAC equipment depends on regular maintenance. Many owners of Xiaomi Mi Air Purifier devices face a drop in performance or the appearance of extraneous noise, unaware that the cause lies in the contamination of internal components. Clogged filters not only stop cleaning the air, but also become a source of bacteria and unpleasant odors in the room.
In this article, we will discuss a detailed algorithm of actions for safe cleaning of all types of filter elements, including: HEPA-You'll learn which parts can be washed with water and which require only dry cleaning to keep expensive electronics out of order, and the right care will extend the life of the device and ensure a healthy climate in your home.
Before starting the disassembly, you need to prepare the workplace and tools. You will need a soft brush, a vacuum cleaner with blow function (or compressor), warm water and possibly a mild detergent. Important: never use aggressive chemicals or abrasives, as they can damage the structure of the filter materials.
Preparation for cleaning and safety
The first and most critical step is to completely shut down the device. Remove the plug from the plug and wait for the indicators on the control panel to go out. Xiaomi Air Purifier is an electrical appliance, and any manipulation of internal components should only be carried out in the absence of voltage in the network. This eliminates the risk of short circuit or electric shock.
Find a free surface that can be easily wiped, because the cleaning process can pour accumulated dust. If you have a model with a touch screen, try not to wet the surface. Also prepare a container for soaking washable parts, if your model provides this option.
⚠️ Warning: Never attempt to disassemble the device body or remove the back cover with electronics.
For convenience, cover the floor with newspapers or old sheets. Dust accumulated inside can be allergenic, so people with hypersensitivity should wear a mask. Safety is the number one priority when servicing any smart appliance.
Rear cover removal and filter removal
The process of accessing filter elements in Xiaomi cleaners is unified, but has its own nuances depending on the series (2, 3, 3H, 4, 4 Pro). In most models, the back cover is fixed with a magnetic lock or a simple stop. Find a notch on the end of the case, usually indicated by a filter icon or arrow.
Press the lock and smoothly pull the lid over yourself. Don't use sudden movements to avoid damaging plastic latches. Inside, you'll see a cylindrical filter unit that can be combined into a single (3-in-1) design or split into separate layers, like the new Air Purifier 4 series.
Carefully remove the filter by taking a special tongue or handle. Pay attention to the orientation: there is usually a mark on the end indicating which side of the element should face the fan. Remember or take a picture of the position so that when assembly does not make an error. Incorrect installation can lead to the sucking of untreated air past the filter.
Cleaning of the pre-filter (Pre-filter)
The outer layer, often called pré-filter, It's a plastic or metal mesh, and its primary function is to trap large dust, animal hair and pile, protecting the main body. HEPA-Fast-clogging filter, which is the element that needs the most frequent cleaning.
If the net is removable (in some models it is part of the lid case), it can be washed under running water. Use warm water and a soft sponge. To remove the swelling dirt, you can use a small amount of liquid soap.
- 🧼 Wash the netting under the shower, removing visible lumps of dust.
- 🖐️ Gently wipe the surface with a soft cloth without using hard brushes.
- 💨 Blow the cells with compressed air or vacuum cleaner on the back side.
- 🌞 Leave to dry at room temperature until completely dry.
Can I wash the pre-filter with soap?
It is strictly forbidden to install a wet pre-filter back into the device, water trapped on the motor or sensors will cause corrosion or short circuit, drying time can be from 12 to 24 hours depending on the humidity in the room.
Care for HEPA-filter-layer
The central element of the cleaning system is HEPA-High Efficiency Particulate Air, which is made of compressed fiber, traps microscopic particles, allergens and viruses, and unlike pregrids, it can't be washed with water.
Contact with moisture causes the fibers to swell, break down the structure, and mold to form inside the material. HEPA-The hair dryer filter is also dangerous: high temperatures can deform the adhesive base and melt thin fibers, making the filter useless.
Use a narrow vacuum cleaner to clean the stain, walk carefully along the surface of the filter, trying not to press too hard to damage the corrugated structure, and move from center to edge or top to bottom, following the direction of the folds.
☑️ Checking status HEPA-filter
If the filter has a pronounced damp or mold smell, it must be replaced, even if it looks whole. The coal layer, which often comes in tandem with HEPA, is also not subject to (recovery) at home. The absorption of gases and odors is irreversible without special industrial equipment.
⚠️ Attention: Attempting to wash HEPA-The filter in the washing machine is guaranteed to destroy its properties, and once it's dry, it will become a dense lump of paper, through which air will no longer pass.
The main filter resource in a city setting is 3 to 6 months of active operation.The Mi Home app usually notifies you to replace, but a visual inspection sometimes gives a more accurate picture, especially if you live in an area with high dust content.
Cleaning of air quality sensors and fan
The side or back of the case often has an air quality sensor hole, which analyzes the concentration of PM2.5 and adjusts the fan rotation speed, and over time, the laser camera and the inlet get clogged with dust, which leads to incorrect readings.
To clean, use a dry cotton swab. Gently wipe the inside of the hole and visible sensor elements. Do not use the liquid inside the case. If the contamination is severe, you can slightly moisten the stick, but then make sure to let the moisture completely evaporate before turning on.
| Component | Cleaning method | Frequency | Can I wet you? |
|---|---|---|---|
| Preliminary grid | Water, vacuum cleaner | Once every 2 weeks | Yes. |
| HEPA-filter | Vacuum cleaner, dry brush | Once a month | No. |
| Coal filter | Replacement | Upon expiration of the resource | No. |
| Sensor PM2.5 | Cotton swab | Every 2-3 months | No. |
The fan group in modern Xiaomi models is often covered with a protective grille, and it is difficult to reach the blades without completely disassembling the body. However, if you notice plaque on visible parts, wipe them with a dry wipe. Dust on the blades can cause imbalance and increased noise when working at high speeds.
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To clean hard-to-reach areas inside the enclosure (around the sensor), use a compressed air canister. Short purges effectively remove dust from the crevices where the cotton swab will not fit.
Cleaning the sensor regularly is key to smart device operation: If the sensor is contaminated, the cleaner may think the room air is perfect, and run at a minimum while you choke on the dust, or vice versa, hum at maximum in a clean room.
Drying and proper assembly of the device
Once all the washing elements have been cleaned, the drying stage is the most important step, which requires patience, and make sure that there are no drops of water left in the folds of the pre-filter or on the fasteners.
Place the parts in a well-ventilated place, away from direct sunlight and heaters. The sun can make the plastic brittle and the battery accelerates deformation. The optimal drying time is 24 hours. Even if the surface appears dry, there can be moisture inside the porous materials.
The assembly is done in reverse order. Set the main filter, observing the markings of the top and bottom. Then put on a pre-grid or a cover. When you close the back, make sure that the magnetic lock is snapped with a characteristic click around the perimeter.
⚠️ Warning: If the device makes a whistle or vibration after assembly, check the density of the lid. A loosely closed case disrupts aerodynamics and reduces cleaning efficiency.
Turn the device on. The filter change indicator (orange strip) can light up on the display if you cleaned the old filter but didn't reset the meter. In the Mi Home app or (clicking a button) on the case, you can reset the resource timer.
Frequent questions and operational advice
Caring for an air purifier doesn't require complex skills, but knowing the nuances helps avoid common mistakes. Many users ask questions about the compatibility of detergents and the frequency of procedures. Below are the answers to the most common of them.
Use only soft, neutral, fragrance-free detergents if there is an urgent need. Chemical flavors can be absorbed into plastic and filters, after which the cleaner will distribute them throughout the room, which defeats the purpose of the device.
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Regular cleaning of the pre-filter every 2 weeks increases the life of the main filter. HEPA-filter up to 30% and maintains the declared performance of the device.
Remember to keep an eye on the in-app display. Smart algorithms calculate the resource based on the operating time and sensor data, but in dusty conditions, real wear can come sooner. Visual control is always more reliable than electronics.