Mijia Vacuum Cleaner 4 C FAQ

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Basic InformationQ1: What are the selling points of the Mijia Vacuum Cleaner 4 C?A: For your reference, here are the selling points of the Mijia Vacuum Cleaner 4 C:1. The vacuum cleaner is equipped with 170 AW hurricane suction power and up to 75 minutes of long-lasting battery endurance for stronger cleaning performance.2. It features white-light illumination for faster cleaning and a 5-stage filtration system with 99.97% filtration efficiency for more thorough dust removal.3. It supports multi-scenario cleaning with an all-flooring electric brush bar and a 2-in-1 crevice brush for efficient all-in-one cleaning. Q2: What is the model of the Mijia Vacuum Cleaner 4 C?A: The model of the Mijia Vacuum Cleaner 4 C is F205. Q3: How many modes does the Mijia Vacuum Cleaner 4 C have, and what is the power of each mode?A: The Mijia Vacuum Cleaner 4 C has three modes: Eco mode, Standard mode, and Turbo mode.Please refer to the power information for each mode below:Vacuum cleaner or when it is connected to the 2-in-1 crevice brush:1. Eco mode: 50 W ± 5 W (Constant power for the first 30 minutes, then linearly decreases within 1 minute to 40 W ± 5 W).2. Standard mode: 120 W ± 10 W (Constant power for the first 5 minutes, then linearly decreases within 1 minute to 90 W ± 5 W).3. Turbo mode: 350 W ± 10 W (Constant power for the first 5 minutes 30 seconds, then linearly decreases to 240 W ± 5 W).When the vacuum cleaner is connected to the all-flooring electric brush bar:1. Eco mode: 70 W ± 5 W (Constant power for the first 25 minutes, then linearly decreases within 1 minute to 50 W ± 5 W).2. Standard mode: 100 W ± 10 W.3. Turbo mode: 350 W ± 15 W (Constant power for the first 3 minutes, then linearly decreases to 240 W ± 10 W). Q4: What are the functions of the buttons on the Mijia Vacuum Cleaner 4 C?A: The Mijia Vacuum Cleaner 4 C has a Mode Button and an On/Off Button.The Mode Button is located on the upper part of the main unit. Briefly press the button to cycle through the vacuum cleaner’s operating modes, allowing you to conveniently adjust the suction power according to different cleaning needs. When switching modes, you can notice changes in the indicators and motor sound.The On/Off Button is a trigger-style button located on the handle of the main unit, positioned where your index finger naturally rests while gripping the handle. It controls the start and stop of the device. Pressing the trigger briefly or holding it will turn the vacuum cleaner on, and the device will continue operating continuously. Pressing it again will turn the device off. During cleaning, there is no need to keep holding the trigger, making the operation more effortless. Once powered on, the indicator will illuminate, indicating that the device has entered working mode. Q5: What is the voltage of the Mijia Vacuum Cleaner 4 C?A: The rated voltage of the Mijia Vacuum Cleaner 4 C is 25.9 V. Q6: What is the air wattage of the Mijia Vacuum Cleaner 4 C?A: The air wattages of the Mijia Vacuum Cleaner 4 C are as follows:1. Eco mode: ≥ 15 AW.2. Standard mode: ≥ 45 AW.3. Turbo mode: > 170 AW. Q7: What is the rated power of the Mijia Vacuum Cleaner 4 C?A: The rated power specifications of the Mijia Vacuum Cleaner 4 C are as follows:Vacuum Cleaner: 400 W ± 5%. (Under 10-hole load: 450 W ± 5%. No-load condition: 350 W ± 10 W)When the vacuum cleaner is connected to the all-flooring electric brush bar: 365 W ± 5% (350 W vacuum cleaner + 15 W floor brush load condition). Q8: What do the indicators on the Mijia Vacuum Cleaner 4 C mean?A: In daily use scenarios, the indicators of the Mijia Vacuum Cleaner 4 C are arranged from left to right as LED1, LED2, and LED3.The indicator meanings of the vacuum cleaner are as follows:1. When LED1 shows white breathing light while LED2 and LED3 are off, the device is charging, and the battery level is below 33%.2. When LED1 is in white, LED2 shows white breathing light, and LED3 is off, the device is charging, and the battery level is below 66%.3. When LED1 and LED2 are in white while LED3 shows white breathing light, the device is charging, and the battery level is below 100%.4. When LED1, LED2, and LED3 are all in white, the device is fully charged.5. When LED1 is solid white and LED2 and LED3 are off, the device is in eco mode and is operating properly.6. When LED1 is solid red while LED2 and LED3 are off, the device is operating with a low battery (below 5%).7. When LED1 is flashing in red and LED2 and LED3 are off, the battery is depleted.8. When LED1 and LED2 are solid white while LED3 is off, the device is in standard mode and operating properly.9. When LED1 and LED2 are solid red while LED3 is off, the device is operating with a low battery (below 5%).10. When LED1 and LED2 are flashing in red while LED3 is off, the battery is depleted.11. When LED1, LED2, and LED3 are all solid white, the device is in turbo mode and operating properly.12. When all three LEDs are solid red, the device is operating in turbo mode with a low battery (below 5%).13. When all three LEDs are flashing in red, the battery is depleted.14. When LED1 blinks red and white alternately, there is a fault: the airway is blocked.15. When LED2 blinks red and white alternately, there is a fault: the roller brush is tangled.16. When LED3 blinks red and white alternately, this shows the other errors (such as battery high-temperature protection or an incompatible adapter).17. When all three LEDs show a red cycling animation, a repair request is required.18. When all LEDs are off, the device is either powered off or charging. The device state is either powered off or the power cable is not properly connected during charging. Q9: What filtration system does the Mijia Vacuum Cleaner 4 C use?A: The Mijia Vacuum Cleaner 4 C uses a 5-stage filtration system with a single-cone cyclone design and an E12-grade outlet HEPA filter.After dust and debris enter through the suction port, they pass through a metal filter, a cyclone cone filter, a pre-filter, a post filter, and a motor pre-filter. This multi-stage process ensures that dust is effectively captured while clean air is released. Q10: What environments is the Mijia Vacuum Cleaner 4 C suitable for?A: The Mijia Vacuum Cleaner 4 C, when used with different brush heads, is suitable for hard floors, short-pile carpets, crevices, corners, and low-clearance spaces. It is recommended for indoor household use only. It should not be used outdoors, in industrial or commercial environments, in humid areas, near heat sources, in flammable or explosive locations, under direct sunlight, or on unstable surfaces. Q11: Does the Mijia Vacuum Cleaner 4 C support both dry and wet debris?A: No, the Mijia Vacuum Cleaner 4 C is a dry vacuum cleaner only and cannot be used to pick up liquids. Using it to vacuum liquids can cause damage to the device.If liquid is accidentally sucked in, immediately stop the device, remove the filter, pre-filter, and post-filter, and place the main unit and components in a cool, ventilated area to dry. After fully drying, reassemble and test the device again. Q12: What types of waste can the Mijia Vacuum Cleaner 4 C clean?A: The Mijia Vacuum Cleaner 4 C is designed for daily dry cleaning in the home and can handle the following types of debris:1. Floor dust and hair: light dust on floors and carpets, pet hair, dandruff, etc.2. Small particles: breadcrumbs, rice grains, sand, cat litter granules, etc.3. Crevice dust: window tracks, sliding door rails, corners, keyboard gaps, etc. (When used with the 2-in-1 crevice brush)4. Elevated dust: ceilings, air conditioner vents, curtain rails, etc. (When used with extension rod and brush head.)The following types of waste should not be cleaned:1. Liquids or wet waste: water, beverages, oil stains, etc. (This is a dry vacuum cleaner. Liquids could damage the motor.)2. Fine powders: gypsum dust, cement dust, fireplace ash, printer toner (These can clog the filter and damage the motor.)3. Sharp or hard objects: glass shards, nails, screws, coins (These can damage the brush head or dust container.)4. Burning materials: matches, cigarette butts, ash (fire risk)5. Sticky or staining substances: shoe polish, paint, pigments (These can adhere inside the airflow path and be difficult to clean.)6. Toxic or corrosive chemicals: gasoline, bleach, ammonia, etc.7. Large or clumped debris: large clumps of cat litter, wet tissues, paper balls, etc. (These can block the airflow channel.) Q13: Can the Mijia Vacuum Cleaner 4 C be used to clean larger debris?A: Yes, the Mijia Vacuum Cleaner 4 C can clean larger debris, but please note that if the particles are too large, they could get stuck in the extension rod or at the brush head inlet and cause a blockage. In such cases, you need to remove the blockage manually to avoid damaging the device. Q14: What does the MAX mark on the dust compartment of the Mijia Vacuum Cleaner 4 C mean?A: The “MAX” mark on the Mijia Vacuum Cleaner 4 C dust compartment indicates the internal dust level line. It is not the absolute maximum capacity of the dust compartment, but continuing to use the vacuum cleaner after dust exceeds the MAX line could lead to reduced suction power, filter blockage, or even motor damage. When the collected dust reaches the MAX mark, please empty the dust compartment promptly. Q15: What are the three holes in the dust compartment suction port on the main unit of the Mijia Vacuum Cleaner 4 C for?A: The three holes in the dust compartment suction port on the main unit of the Mijia Vacuum Cleaner 4 C are power pins for the all-flooring electric brush bar. They are used to supply power to the brush bar. Q16: Why does the Mijia Vacuum Cleaner 4 C have an odor after unboxing?A: During the manufacturing process, the Mijia Vacuum Cleaner 4 C uses injection-molded plastic parts, rubber components, and other materials. In addition, moisture-proof packaging materials are used inside the packaging box. These materials can produce a certain odor when the product is first opened. This is normal, and the smell will gradually disappear after a period of normal use. Q17: Is it normal for vertical lines to appear on certain parts of the Mijia Vacuum Cleaner 4 C?A: The vertical lines on certain parts of the Mijia Vacuum Cleaner 4 C are not cracks or defects. They are seam lines formed during the manufacturing process and are normal marks of production. They do not affect the normal use of the product. Q18: What is the noise level of the Mijia Vacuum Cleaner 4 C?A: The noise level of the Mijia Vacuum Cleaner 4 C differs in different modes and with different brushes:Main unit: Eco mode: ≤ 70 dB(A), Standard mode: ≤ 75 dB(A), Turbo mode: ≤ 84 dB(A).All-flooring Dust revealing Brush Bar: Eco mode: ≤ 75 dB(A), Standard mode: ≤ 76 dB(A), Turbo mode: ≤ 84 dB(A). Product AppearanceQ1: What are the size and weight of the Mijia Vacuum Cleaner 4 C?A: The dimensions of the Mijia Vacuum Cleaner 4 C are as follows:1. Main unit: 329 × 110 × 234 mm.2. Main unit + all-flooring electric brush bar: 1175 × 255 × 234 mm.The weights of the device are as follows:1. Whole unit (main unit + extension rod + all-flooring electric brush bar): 2.334 kg.2. Main unit: 1.481 kg.3. Extension rod: 0.231 kg.4. All-flooring electric brush bar: 0.622 kg.5. 2-in-1 crevice brush: 75 g.6. Wall storage mount: 101 g.7. Power adapter: 173 g. Q2: What components are included with the Mijia Vacuum Cleaner 4 C?A: The accessories of the Mijia Vacuum Cleaner 4 C includes a vacuum cleaner, a user manual, an extension rod, a 2-in-1 crevice brush, an all-flooring electric brush bar, a wall storage mount (non-charging, including screw × 2 and wall plug × 2), and a power adapter. Q3: What is the capacity of the dust compartment of the Mijia Vacuum Cleaner 4 C?A: The dust compartment capacity of the Mijia Vacuum Cleaner 4 C includes two specifications: Max line ≥ 0.35 L, and the total maximum capacity is ≥ 0.55 L. Q4: Does the Mijia Vacuum Cleaner 4 C have a display screen?A: No, the Mijia Vacuum Cleaner 4 C does not have a screen. Q5: What material is the display screen on the Mijia Vacuum Cleaner 4 C made of?A: The Mijia Vacuum Cleaner 4 C does not have a screen. Brush InformationQ1: What brush heads does the Mijia Vacuum Cleaner 4 C use?A: The Mijia Vacuum Cleaner 4 C has an All-flooring Electric Brush Bar and a 2-in-1 Crevice Brush. Q2: What are the rated voltage and power of the all-flooring electric brush bar of the Mijia Vacuum Cleaner 4 C?A: The all-flooring electric brush bar of the Mijia Vacuum Cleaner 4 C has a rated voltage of 22.2 V and a rated power of 15 W. Q3: What are the rated voltage and power of the mini electric brush of the Mijia Vacuum Cleaner 4 C?A: The Mijia Vacuum Cleaner 4 C has no mini electric brush. Q4: What to do if the 2-in-1 Crevice Brush of the Mijia Vacuum Cleaner 4 C becomes deformed?A: The bristles of the 2-in-1 crevice brush on the Mijia Vacuum Cleaner 4 C are made of a special material with good self-recovery properties. If they become bent due to normal use or storage, they will return to normal after being left to rest for a period of time, or they can be restored by combing with warm water. If the bristles are severely deformed due to exposure to chemical solvents, high-temperature baking, washing and scrubbing, or long-term aging, please contact the after-sales service center. Q5: What should be noted when using a pet brush with the Mijia Vacuum Cleaner 4 C?A: The Mijia Vacuum Cleaner 4 C has no pet brush. Q6: Why is there significant resistance when using the Mijia Vacuum Cleaner 4 C's mini electric brush?A: The Mijia Vacuum Cleaner 4 C has no mini electric brush. Q7: Does the Mijia Vacuum Cleaner 4 C come with a dedicated accessory storage bag?A: No. The Mijia Vacuum Cleaner 4 C does not come with a dedicated accessory storage bag. However, the wall storage mount can accommodate all accessories. The main unit, extension rod, and all-flooring electric brush bar can be assembled and stored together, and the 2-in-1 crevice brush can also be placed in the remaining slot, allowing all accessories to be stored on the bracket. Q8: Is it normal for the all-flooring electric brush bar headlight on the Mijia Vacuum Cleaner 4 C to stay on?A: Yes. The all-flooring electric brush bar headlight on the Mijia Vacuum Cleaner 4 C is designed to turn on automatically during use and cannot be turned off manually. It helps you see dust more clearly during cleaning and improves cleaning effectiveness. Q9: Why can’t the Mijia Vacuum Cleaner 4 C completely remove dust along the edges?A: This is a common physical limitation of vacuum cleaners and is not a product defect. The all-flooring electric brush bar of the Mijia Vacuum Cleaner 4 C could not fully fit against walls or the bottoms of furniture, leaving some blind spots. In addition, suction is strongest at the center of the inlet while airflow is weaker at the edges, so dust can remain in corners. To improve cleaning results, try cleaning from multiple angles or use the 2-in-1 crevice brush for more precise edge and gap cleaning. Q10: Is the Mijia Vacuum Cleaner 4 C suitable for cleaning under beds?A: Yes. With the extension rod and all-flooring electric brush bar combined, the Mijia Vacuum Cleaner 4 C can reach under beds, sofas, and other low spaces for cleaning. If there are thresholds or beams under the bed, take care to avoid collisions when moving it. The minimum usable clearance is about 10–13 cm. If the space is too low, the floor brush can not fully fit underneath, in which case the 2-in-1 crevice brush can be used for basic cleaning. Product InstallationQ1: How to install the wall storage mount of the Mijia Vacuum Cleaner 4 C?A: Choose a cool and dry place with an electrical outlet nearby. Before installing, make sure that there are no wires or pipelines in the wall directly behind where the mount will be installed. The distance between the bottom of the wall storage mount and the ground is recommended to be 115 cm.To install the wall storage mount of the Mijia Vacuum Cleaner 4 C, please refer to the following steps:1. Hold the wall storage mount in the pre-installation position and make marks on the wall according to the holes on the mount.2. Use a drill with a 6 mm drill bit to drill a hole approx. 30 mm deep in each marked position, then insert a wall plug into each hole.3. Align the screw holes on the wall storage mount with the holes on the wall, and then use the included screws to secure the wall storage mount to the wall. Q2: How to assemble and disassemble the accessories of the Mijia Vacuum Cleaner 4 C?A: The main unit and accessories of the Mijia Vacuum Cleaner 4 C use a “push-and-click” connection method. Follow the steps below:1. Installing the extension rod: Align the front of the main unit with the end of the extension rod and firmly insert it until you hear a “click,” indicating it is locked in place.2. Installing the brush head: Align the front of the extension rod with the inlet of the brush head and push firmly until it clicks into place.3. Disassembly method: Press the release button at the connection point and pull firmly to detach. Q3: Why is the all-flooring electric brush bar of the Mijia Vacuum Cleaner 4 C tilted when placed on a wall storage mount?A: Since the all-flooring electric brush bar of the Mijia Vacuum Cleaner 4 C contains a built-in motor and the motor is not positioned at the exact center of the brush head, the weight distribution is uneven. As a result, the floor brush could tilt when hung vertically. This is normal and does not affect normal use or storage. Q4: Can the Mijia Vacuum Cleaner 4 C be used without installing the filter?A: No. If the filter is not installed in the Mijia Vacuum Cleaner 4 C, dust and debris could enter the motor without the filter installed, which can damage critical internal components. Product UsageQ1: What are the precautions for using the Mijia Vacuum Cleaner 4 C?A: The precautions for using the Mijia Vacuum Cleaner 4 C are as follows:Environment and conditions of use:1. This vacuum cleaner is for indoor use only. Do not use or install it in outdoor, industrial, or commercial environments.2. Do not charge or store the vacuum cleaner near heat sources or in humid areas, such as near radiators, in kitchens, or bathrooms.3. The charging temperature should be kept between 5 °C and 35 °C. Otherwise, the battery could be damaged.4. Do not place the product on unstable surfaces such as chairs or dining tables to prevent falls and damage.Electrical safety:1. Do not touch the plug or any live electrical parts with wet hands.2. Only use officially recommended replacement parts and the original power adapter (Model: GC32-310100-5A).3. Check the power adapter for damage before use. Do not use it if it is damaged.4. Do not pull the power cord when unplugging the adapter.5. Do not use the product near flammable or explosive materials.Operating precautions:1. Before installation, removal, cleaning, or maintenance, always turn off the device and unplug the power adapter.2. Do not block the air inlet or outlet, as this could cause overheating and damage.3. Do not place any objects near the suction inlet.4. Do not use the product if accessories are damaged or not properly installed.5. Always keep the device powered off when lifting or carrying it.6. During operation, keep moving parts such as the brush head away from people and pets.Items that should not be vacuumed:1. Liquids or wet waste.2. Fine dust such as drywall dust or fireplace ash.3. Smoking or burning materials (such as charcoal, cigarette butts, or matches).4. Sharp or hard objects (such as glass, nails, screws, or coins).5. Heavy grease, highly sticky, or strongly staining substances (such as shoe polish, paint, or pigments).6. Flammable or explosive liquids such as gasoline, or toxic chemicals such as bleach, ammonia, or drain cleaners.7. Toner or powder from laser printers or photocopiers.Handling abnormal conditions:1. If abnormal noise, unusual odor, excessive heat, or malfunction occurs, stop using the product immediately, turn it off, and disconnect the power supply.2. This product should only be repaired by authorized after-sales service personnel.Battery and charging:1. Fully insert the adapter plug into the power outlet during charging.2. Do not use the vacuum cleaner when the suction inlet is blocked. Clean away dust, lint, hair, and other debris promptly.Children and people with special needs:1. Children should be supervised to ensure they do not play with the appliance.2. Persons with reduced physical, sensory, or mental capabilities, or those lacking experience and knowledge (including children), should only use this product under the supervision or guidance of a person responsible for their safety.Other prohibited actions:1. Do not immerse the product or its accessories in water or other liquids for cleaning.2. After cleaning or maintenance, ensure all parts are completely dry before reassembly and use.3. Do not apply any fragrance products to the pre-filter or post- filter, as this can cause a fire. Q2: How to choose the appropriate mode for the Mijia Vacuum Cleaner 4 C?A: The Mijia Vacuum Cleaner 4 C offers three cleaning modes: Eco mode, Standard mode, and Turbo mode. You can select the appropriate mode based on different cleaning scenarios. For daily cleaning, it is recommended to start with Eco mode or Standard mode, and switch to Turbo mode only if stronger suction is needed. Avoid using Turbo mode for extended periods, as it could reduce battery runtime.The detailed information for each mode is as follows:1. Eco mode provides the lowest suction power and the longest runtime (handheld ≥ 75 minutes, with the all-flooring electric brush bar ≥ 45 minutes). It is suitable for light daily cleaning of hard floors, such as tiles or wood, including dust and hair. Ideal for large-area whole-house cleaning.2. Standard mode provides medium suction power and balanced runtime (handheld ≥ 35 minutes, with the all-flooring electric brush bar ≥ 25 minutes). It is suitable for carpets, pet hair, mixed floor types, and general debris, balancing cleaning performance and battery endurance.3. Turbo mode provides the strongest suction power and the shortest runtime (≥ 10 minutes). It is suitable for stubborn dirt, heavily dusted carpets, deep corners, or large debris. Recommended for short-duration intensive cleaning tasks. Q3: Does the Mijia Vacuum Cleaner 4 C have a blockage protection function?A: Yes, the Mijia Vacuum Cleaner 4 C has a blockage protection function. If the device suddenly stops working during use, all indicators turn red, and then the first indicator begins flashing red and white, which means the vacuum cleaner has entered blockage protection mode. In this case, check and clean the dust compartment, filter, pre-filter, post-filter, extension rod, and brush head. Q4: Why is the suction power of the Mijia Vacuum Cleaner 4 C weak when it is turned on first?A: When the Mijia Vacuum Cleaner 4 C is first powered on, it defaults to Eco mode, which provides the lowest suction power and the longest battery endurance. If stronger suction is needed, you can short-press the mode switch button located on the top of the main unit to switch to Standard mode or Turbo mode. Q5: What to do if dust falls out of the Mijia Vacuum Cleaner 4 C after it stops working?A: Dust leakage of the Mijia Vacuum Cleaner 4 C refers to dust falling out from the air outlet, connection joints, or the brush head.Possible causes and solutions are as follows:1. Check whether the post-filter is not installed properly, has gaps, or is damaged, and whether the pre-filter is torn or not properly installed. Replace and reinstall them correctly if necessary.2. Check whether the connection parts are tightly secured. Reinsert and ensure all components are firmly connected before use.3. Dust from the brush head or extension rod can not fully enter the dust compartment yet. After cleaning, keep the vacuum cleaner running for a few extra seconds to ensure all debris is fully collected into the dust compartment. Q6: Is it normal for the Mijia Vacuum Cleaner 4 C accessories to vibrate at the connection to the main unit?A: To facilitate easy assembly and disassembly of the Mijia Vacuum Cleaner 4 C, small gaps are designed at the connection points between the extension rod, brush head, and main unit while still ensuring airtight airflow. During use, slight vibration noise could occur at these joints. As long as the connection clicks into place and is securely locked, this is normal and safe to use. Q7: Is it normal for vibration noise to come from inside the main unit of the Mijia Vacuum Cleaner 4 C?A: This is not normal. It is recommended to contact the after-sales service center for inspection and repair. Q8: What to do if the suction power of the Mijia Vacuum Cleaner 4 C is reduced?A: If the suction of the Mijia Vacuum Cleaner 4 C is reduced, the possible causes and solutions are as follows:1. Operating modes: The suction power follows the order Eco mode < Standard mode < Turbo mode. Please check whether a lower power mode is selected. You can switch to Turbo mode for stronger suction. However, increased suction power will result in shorter battery endurance.2. Product design feature: To ensure longer battery endurance while still meeting normal usage requirements, the device is designed to automatically reduce power during operation. If the suction power decreases after a period of use but remains stable, this is normal and does not affect regular operation.3. Full dust compartment: Check whether the dust inside the dust compartment has reached the MAX line. If so, please empty it promptly.4. Blockage: Check whether the brush head or extension rod is clogged with debris, and whether the post-filter or pre-filter is dirty or clogged. Clean them promptly. If the post-filter and pre-filter are heavily soiled, rinse with clean water and allow them to dry completely before reuse.5. Low battery level: When the battery is low, suction power could decrease. Check whether the first indicator is flashing red continuously. If so, please fully charge the device before use. Q9: What to do if the Mijia Vacuum Cleaner 4 C is too noisy?A: The operating noise of the Mijia Vacuum Cleaner 4 C has undergone strict quality inspection and complies with relevant household appliance noise standards. There will be no excessive noise or abnormal sounds caused by product defects.If you feel that the noise is loud during use, possible causes and solutions are as follows:1. Brush head entanglement or blockage: Check whether the all-flooring electric brush head is wrapped with hair or stuck. Check whether there are large or hard foreign objects in the brush head or extension rod. Check whether the post-filter or pre-filter is clogged with dust. Also check whether hard debris has accumulated inside the dust compartment (hard particles could hit the inner wall during airflow). Clean the components if necessary.2. Pre-filter is not installed properly: Remove the cyclone cone and check whether the pre-filter is correctly installed. Reinstall it properly and try again.3. Loose connection: Check whether the main unit, extension rod, and brush head are securely connected. Loose connections could cause resonance noise. Reinsert all parts firmly and try again. Q10: Why does the Mijia Vacuum Cleaner 4 C heat up very high after using it for a while?A: The motor generates heat during high-speed operation, so an increase in body temperature is normal, especially when using Turbo mode for extended periods. Most vacuum cleaners on the market exhibit this behavior, so you can use them with confidence. As usage time increases and more dust is collected, clogging of the filter components could also cause heat buildup. Therefore, it is recommended to clean the device regularly after use. In addition, please use the Mijia Vacuum Cleaner 4 C in a room-temperature environment and avoid high-temperature conditions to ensure proper heat dissipation. Q11: Why is the Mijia Vacuum Cleaner 4 C not vacuuming completely?A: Due to different usage environments, dust or dirt could sometimes not be completely removed. Please check whether the dirt is firmly attached to the surface and difficult to dislodge. Try moving the Mijia Vacuum Cleaner 4 C back and forth over the area multiple times for better cleaning. If you feel the suction power is weak, switch to Standard mode or Turbo mode and clean the area repeatedly. Q12: Why does the Mijia Vacuum Cleaner 4 C make a loud noise after being turned off?A: To ensure that dust inside the dust compartment does not fall back after shutdown, the Mijia Vacuum Cleaner 4 C continues to operate for a short period after being turned off. Since the all-flooring electric brush bar stops working at this time, the motor airflow noise can sound more noticeable and sharper. This is a normal design and not a malfunction, so you can use it with confidence. Q13: What to do if the all-flooring electric brush bar of the Mijia Vacuum Cleaner 4 C is difficult to control during cleaning?A: Please check whether the floor surface is slippery and avoid using the Mijia Vacuum Cleaner 4 C on wet floors. In addition, the small wheels of the all-flooring electric brush bar could be tangled with hair or adhesive debris. Please inspect and clean the wheels. If the wheels have been removed previously, make sure they are properly reinstalled. Q14: Can the Mijia Vacuum Cleaner 4 C be stored in a car?A: It is not recommended to store the Mijia Vacuum Cleaner 4 C inside a vehicle, especially during summer or in high-temperature weather conditions. Q15: Can the Mijia Vacuum Cleaner 4 C be placed against a wall during or after use?A: It is not recommended to lean the Mijia Vacuum Cleaner 4 C directly against a wall, especially in unstable areas or places where it can be easily knocked over, as this increases the risk of tipping and damaging the device. If cleaning is temporarily interrupted, it is recommended to turn off the device and place the main unit flat on the floor. After use, clean the vacuum cleaner promptly and return it to the wall storage mount. Q16: Can the Mijia Vacuum Cleaner 4 C switch between different power frequencies?A: Yes. The Mijia Vacuum Cleaner 4 C can operate with both 50 Hz and 60 Hz power frequencies when used with the original power adapter. Power SupplyQ1: What is the battery capacity of the Mijia Vacuum Cleaner 4 C?A: The rated battery capacity of the Mijia Vacuum Cleaner 4 C is 2600 mAh, and the nominal capacity is 2250 mAh. Q2: What is the rated input of the Mijia Vacuum Cleaner 4 C power adapter?A: The rated input of the Mijia Vacuum Cleaner 4 C power adapter is 100–240 V~ 50/60 Hz, and the rated input current is 1.0 A. Q3: What is the rated output of the Mijia Vacuum Cleaner 4 C power adapter?A: The rated output of the Mijia Vacuum Cleaner 4 C is 31 V, and the rated output current is 1.0 A. Q4: What is the battery endurance of the Mijia Vacuum Cleaner 4 C in different operating modes?A: The battery endurance specifications of the Mijia Vacuum Cleaner 4 C are as follows:1. The battery endurance of the main unit is ≥ 75 minutes in Eco mode, ≥ 35 minutes in Standard mode, and ≥ 10 minutes in Turbo mode.2. When the vacuum cleaner is used with the all-flooring electric brush bar, the battery endurance is ≥ 45 minutes in Eco mode, ≥ 25 minutes in Standard mode, and ≥ 10 minutes in Turbo mode. Q5: What should be noted when charging the Mijia Vacuum Cleaner 4 C?A: To extend the battery endurance of the Mijia Vacuum Cleaner 4 C, please follow the instructions below:1. Environment and temperature: Charge the device in an environment between 5 °C and 35 °C. Extremely high or low temperatures could trigger battery protection, resulting in abnormal charging or very slow charging. Do not charge or store the device in humid or high-temperature areas such as bathrooms, near heaters, or in direct sunlight.2. Charging operation: Only use the original power adapter; otherwise, charging can fail, or the device could be damaged. After using Turbo mode, it is recommended to let the device cool down for 60 minutes before charging to protect the battery. The indicator will turn off when charging is complete. The battery has overcharge protection, but it is still recommended to unplug the adapter once fully charged.3. Storage and maintenance: If the device will not be used for a long period (over one month), fully charge it before storage and keep it in a cool, dry place. Recharge it at least once every 3 months to prevent battery damage from over-discharge. Q6: Can the Mijia Vacuum Cleaner 4 C stay connected to the power supply when not in use?A: It is not recommended to keep the Mijia Vacuum Cleaner 4 C connected to the charger for long periods. Although the lithium battery has overcharge protection (it automatically stops charging when full), long-term connection to power could still affect battery lifespan. If the device will not be used for more than one month, it is recommended to fully charge it, unplug the adapter, and recharge it every 3 months to prevent over-discharge. Q7: Does the Mijia Vacuum Cleaner 4 C need to be fully charged before first use?A: Yes, the Mijia Vacuum Cleaner 4 C needs to be fully charged. The charging time is approximately 4 hours. Q8: Can the Mijia Vacuum Cleaner 4 C be used while charging?A: No, the Mijia Vacuum Cleaner 4 C cannot be used during charging. Q9: Does the Mijia Vacuum Cleaner 4 C support car charging?A: The Mijia Vacuum Cleaner 4 C does not support car charging. Q10: Does the Mijia Vacuum Cleaner 4 C support replacing the battery?A: The Mijia Vacuum Cleaner 4 C EU version supports replacing the battery.Please use official original replacement batteries and follow the steps below:1. Use a flat-head screwdriver wrapped in a towel or soft cloth, align it with the pry hole on the rear cover, and tap the handle to remove the back cover.2. Disconnect the terminals connecting the microswitch and the battery.3. Use a long Phillips screwdriver to remove the four battery fixing screws and keep them safe.4. Remove the old battery and replace it with a new one.5. Reinstall the four battery fixing screws using the screwdriver.6. Reconnect the microswitch and battery terminals, then briefly press the trigger switch to test whether the device powers on normally.7. After successful testing, reinstall the rear cover tightly without any gaps. Make sure the pry hole position is correctly oriented at the bottom of the rear cover and is not installed upside down.Note:The Mijia Vacuum Cleaner 4 C UK/US version does not support replacing the battery. Q11: Why does the indicator of the Mijia Vacuum Cleaner 4 C turn off after charging?A: The indicator of the Mijia Vacuum Cleaner 4 C turns off when charging is complete. The device has overcharge protection (it automatically stops charging when full), so the light will go off after a period of time once fully charged. Q12: What to do if the Mijia Vacuum Cleaner 4 C has not been fully charged for a long time?A: The battery of the Mijia Vacuum Cleaner 4 C has undergone strict quality inspection and is designed to ensure reliable performance under normal use. There will be no charging failure caused by product defects.If the vacuum cleaner takes a long time to charge but still does not reach a full charge, possible causes and solutions are as follows:1. Abnormal temperature: If the ambient temperature is too high or too low, battery protection can be triggered, resulting in slow or interrupted charging. Please charge the vacuum cleaner in a normal indoor environment.2. Non-original adapter: Using a non-original power adapter can cause abnormal charging. Please replace it with the original adapter.3. Poor contact: The charging port could be dirty or loose. Clean it and reconnect the charging cable securely. Use dry cloth or tissue to remove dirt. Do not use sharp tools.4. Blockage protection: Check whether the post-filter, pre-filter, and dust compartment are heavily clogged. When blockage protection is activated, the device will stop working automatically. Clean the components and restart the device to resume normal operation. Q13: What to do if the battery endurance of the Mijia Vacuum Cleaner 4 C is short?A: The battery of the Mijia Vacuum Cleaner 4 C has passed strict quality inspection and normally provides reliable runtime.If battery endurance seems shorter than expected, possible causes and solutions are:1. Mode settings: Check whether Turbo mode is being used, which provides the strongest suction but the shortest runtime.2. Operating mode: Eco mode > Standard mode > Turbo mode in terms of runtime. Using motorized brushes also reduces battery endurance. Choose the appropriate mode and attachment based on needs.3. Insufficient charge: The device could not have been fully charged. Charging time is approximately 4 hours.4. Blockage: Check whether the brush head or extension rod is blocked and whether the post-filter or pre-filter is clogged. Clean them if necessary. If heavily clogged, rinse with clean water and dry thoroughly before use. Q14: What to do if the display screen on the Mijia Vacuum Cleaner 4 C does not light up during charging?A: There is no display screen on the Mijia Vacuum Cleaner 4 C. If the indicator does not light up during charging, check whether the adapter is properly connected, whether the power outlet is working, and reconnect the adapter before checking again. Please use the original adapter. If the issue persists, contact the after-sales service center. Q15: Does the Mijia Vacuum Cleaner 4 C need to be charged if it is not used for a long time?A: Yes. If the Mijia Vacuum Cleaner 4 C is not to be used for an extended period, please fully charge it before storage, unplug the adapter, store it in a cool and dry place, and recharge it every 3 months to prevent battery over-discharge. Smart ControlQ1: Does the Mijia Vacuum Cleaner 4 C support connecting to the Xiaomi Home App?A: The Mijia Vacuum Cleaner 4 C does not support connecting to the Xiaomi Home App. Q2: What do the error icons on the Mijia Vacuum Cleaner 4 C mean?A: There are no specific icons on the Mijia Vacuum Cleaner 4 C. The indicator means the following:1. Alternating red and white flashing (LED1): Air duct blockage (check whether the dust cup, filter, filter element, extension tube, or brush head is blocked).2. Alternating red and white flashing (LED2): Roller brush entangled (check whether the floor brush or anti-mite brush roller is wrapped with hair).3. Alternating red and white flashing (LED3): Battery temperature abnormal (wait for the battery temperature to return to normal before retrying) or non-original power adapter being used.4. Red lights cycling through 1, 2, 3 LEDs: Other malfunction, please contact the after-sales service center.5. Red flashing: If it is a single red light flashing, it can indicate a low battery. If it flashes in a specific mode, please refer to the above content.Solution:Follow the corresponding fault indication: clean any blockages, remove hair from the roller brush, or wait for cooling. If the issue cannot be resolved, contact after-sales service. Q3: Why does the LED area on the display of the Mijia Vacuum Cleaner 4 C show error codes?A: The Mijia Vacuum Cleaner 4 C has no display screen. The product faults are indicated by the status of the indicator. Q4: How does the dirt indicator on the Mijia Vacuum Cleaner 4 C work?A: There is no dirty indicator on the Mijia Vacuum Cleaner 4 C. Other FunctionsQ1: Does the Mijia Vacuum Cleaner 4 C support electronic self-lock mode?A: The Mijia Vacuum Cleaner 4 C does not support electronic self-lock mode. Q2: What to do if the Mijia Vacuum Cleaner 4 C cannot start?A: If the Mijia Vacuum Cleaner 4 C cannot start, please refer to the following troubleshooting steps:1. After turning on the device, if the first indicator flashes red while the other two are off, the battery is empty. Please fully charge it before use. The charging time is about 4 hours.2. If the device runs for a short time after being turned on and then stops, and the first or second light flashes alternately red and white while the other two lights stay solid red, this indicates blockage or roller brush entanglement protection. Please clean the dust compartment, filter, post-filter, pre-filter, and roller brush, then try again.3. If the battery temperature is too high or too low. Please let the vacuum cleaner sit for a while until the temperature returns to normal before trying to turn it on again.4. Please press the On/Off button once briefly to start the device. Do not rapidly press the trigger multiple times in a short period.5. If none of the above methods work, please contact the after-sales service center. Q3: What to do if there is a smell coming from the air outlet of the Mijia Vacuum Cleaner 4 C?A: If there is a smell coming from the air outlet of the Mijia Vacuum Cleaner 4 C, please refer to the following troubleshooting steps:1. Moisture or moldy smell: Check whether the post-filter or pre-filter is the source of the odor. Clean and allow them to dry thoroughly before use. Check whether the garbage in the dust compartment has decomposed, empty and wipe the dust compartment interior promptly. Do not vacuum wet waste or liquids to avoid damage.2. Fragrance or chemical smell: The vacuum cleaner could have sucked in special substances during cleaning. Clean the post-filter, air intake pre-filter, and dust compartment, and dry them thoroughly. Do not apply any scented products to the filter components, as this can affect filtration performance.3. Normal manufacturing odor: Plastic injection parts, rubber components, and moisture-proof packaging materials inside the box could have a slight odor. This is normal and will dissipate after a period of use.4. Burning smell: Stop using the device immediately. Check whether the post-filter, pre-filter, and filter assembly are installed correctly. Improper installation can allow hair, dust, and other flammable debris to enter the motor, which can cause a burning smell due to overheating. If this occurs, please contact the after-sales service center. Cleaning and MaintenanceQ1: What precautions should be taken for daily cleaning and maintenance of the Mijia Vacuum Cleaner 4 C?A: The daily cleaning and maintenance of the Mijia Vacuum Cleaner 4 C should follow these precautions:1. The main unit should not be washed with water: Only wipe with a dry cloth.2. Filter materials should be fully dried: After washing, dry for at least 24 hours. Reinstalling while damp may damage the motor.3. Motor components should not get wet: The floor brush cannot be washed as a whole (it contains a built-in motor).4. Do not use sharp tools: Avoid scraping the dust cup or filter element with hard objects during cleaning.5. Regular replacement of consumables: The pre-filter should be replaced every 3–6 months, and the post-filter should be replaced every 6–12 months.6. Long-term storage precautions: Fully charge the device before unplugging the adapter. Store it in a cool, dry place. Recharge every 3 months to prevent over-discharge of the battery. Q2: How to clean the main unit of the Mijia Vacuum Cleaner 4 C?A: Please use a dry cloth to clean the main unit of the Mijia Vacuum Cleaner 4 C. Do not wash it with water. Pay special attention to areas that easily collect dirt, such as the handle grip, around the buttons, and the surface of the dust compartment. Before cleaning, turn off the device and remove the extension rod and brush head, leaving only the main unit. Do not clean the device while it is charging. Q3: How to clean the dust compartment of the Mijia Vacuum Cleaner 4 C?A: If there is stubborn dirt inside the dust compartment of the Mijia Vacuum Cleaner 4 C, use a dry cloth or dry tissue to wipe it carefully. Do not wash the dust compartment with water or scrape it with sharp tools. Q4: How to empty the dust compartment of the Mijia Vacuum Cleaner 4 C?A: The dust compartment of the Mijia Vacuum Cleaner 4 C features a one-button dust disposal design, allowing you to empty it without removing the entire dust compartment. Before cleaning, make sure the device is turned off and the extension rod and brush head have been removed. Do not clean the device while it is charging.To clean the dust compartment, please refer to the following steps:1. Hold the bottom cover of the dust compartment over a trash bin.2. Press the empty button on the dust compartment, and the bottom cover will automatically pop open.3. The dust and debris will then fall directly into the trash bin. Q5: How to clean the filter assembly of the Mijia Vacuum Cleaner 4 C?A: The post-filter, pre-filter, and filter of the Mijia Vacuum Cleaner 4 C should be removed and cleaned separately by following the steps below:Disassembly:1. Press the empty button to open the bottom cover of the dust compartment.2. Rotate the filter counterclockwise to remove it.3. Remove the pre-filter from the filter.4. Rotate the post-filter counterclockwise to remove it.Cleaning:1. Post-filter: Rinse under running tap water while gently tapping the frame to remove dirt.2. Pre-filter: Gently rinse under running tap water.3. Filter: Wipe with a dry cloth or lightly rinse with water, then allow it to dry.Note:1. The pre-filter and post-filter can only be rinsed. Do not soak.2. When cleaning the post-filter, it is recommended to rinse it repeatedly and tap its edge lightly to remove any dust and debris until it is clean.3. Do not clean the pre-filter and post-filter with your hands, a brush, or other sharp objects to prevent damage.4. If the suction power is still significantly reduced after the pre-filter and post-filter are cleaned, you can try to purchase a compatible original replacement post-filter set.Drying:After cleaning, all components need to be completely dried for at least 24 hours before reassembly. It is recommended to place them upright to speed up drying. Q6: How to reassemble the Mijia Vacuum Cleaner 4 C filter assembly after cleaning?A: To reassemble the post-filter of the Mijia Vacuum Cleaner 4 C, please refer to the following methods:1. Align the dotted positioning mark on the new upper cover with the unlock mark on the main unit, then press it firmly into place.2. Rotate the upper cover counterclockwise until the dotted mark aligns with the lock mark on the main unit.To reassemble the pre-filter of the Mijia Vacuum Cleaner 4 C, please refer to the following methods:1. Press the empty button to open the bottom cover of the dust compartment, remove the filter assembly, and take out the old pre-filter.2. Install the pre-filter into the filter, ensuring it is pressed firmly into place without misalignment or gaps.3. Align the filter with the installation slot inside the dust compartment, then rotate it counterclockwise to lock it securely.4. Confirm that the filter is tightened properly and the pre-filter is flat and securely installed before closing the dust compartment cover. Q7: How to clean the All-flooring Electric Brush Bar (Equipped with Headlight) on the Mijia Vacuum Cleaner 4 C?A: To clean the all-flooring electric brush bar of the Mijia Vacuum Cleaner 4 C, please refer to the following information:1. During floor brush cleaning, remove the roller brush from the floor brush first. Turn the roller brushbar upside down, press the roller brushbar release button to unlock the roller brushbar lock, and then remove the roller brushbar.2. To clean the roller brushbar, use scissors to cut away tangled hair and remove any debris. If the roller brushbar is very dirty, it can be rinsed with clean water. After rinsing, place it upright and allow it to dry for at least 24 hours.3. Clean the small wheels on the floor brush, remove the wheels, and clear away any hair or dirt from the wheels and axles.4. The housing should only be cleaned with dry cloth or tissue. Focus on cleaning the light area, inside the suction inlet, and the outer surface of the housing. Do not rinse or soak the roller brushbar in water, as it contains a built-in motor that could be damaged by water exposure.5. Reinstall the roller brushbar, making sure it's the right way round, and press the roller brushbar lock to lock into place.If you still have questions, please refer to the detailed illustrations in the user manual or scan the QR code on the device body. Q8: How to clean the mini electric brush on the Mijia Vacuum Cleaner 4 C?A: The Mijia Vacuum Cleaner 4 C has no mini electric brush. Q9: How to clean the dust sensor on the Mijia Vacuum Cleaner 4 C?A: The Mijia Vacuum Cleaner 4 C has no dust sensor. Q10: How to clean the 2-in-1 crevice brush assembly on the Mijia Vacuum Cleaner 4 C?A: The 2-in-1 crevice brush of the Mijia Vacuum Cleaner 4 C should be cleaned separately. Do not clean it while it is attached to the main unit. Use your hand or a small brush to remove dust and hair tangled in the bristles. If heavily soiled, the brush section could be rinsed with clean water. Shake off excess water and allow it to dry completely. The whole attachment can be lightly washed with water, but it should be fully dried before use. Do not use hot water or corrosive cleaning agents. Q11: How to clean the pet brush on the Mijia Vacuum Cleaner 4 C?A: The Mijia Vacuum Cleaner 4 C has no pet brush. Q12: Which accessories of the Mijia Vacuum Cleaner 4 C are washable?A: The filter, pre-filter, post-filter, roller brush, and 2-in-1 crevice brush are washable. For other parts, please clean with a dry cloth or wipe with a damp cloth and dry immediately. Do not wash any parts containing a motor, such as the floor brush or the main unit. Do not rinse the dust compartment with water. Please note that "washing" refers to rinsing. Do not soak the parts in water for extended periods, and do not use chemical agents such as cleaning solutions. Q13: Can detergent or disinfectant be used for daily cleaning of the Mijia Vacuum Cleaner 4 C?A: No. The detergent or disinfectant can not be used for daily cleaning of the Mijia Vacuum Cleaner 4 C.