Cleaning sensors robot vacuum cleaner Xiaomi: a complete guide with photos and tips

Xiaomi’s robot vacuum cleaner is a smart device that makes cleaning easier, but over time, its sensors become contaminated, leading to chaotic navigation, skipping spots or constant collisions with furniture. Many users mistakenly think that the problem is a software failure, when it is actually enough to clean the optical sensors and the laser module from dust and fat. In this article, we will analyze what sensors are in the Mi Robot Vacuum, Viomi and Dreame models, how to clean them correctly, and what to do if the robot still “blind” after cleaning.

If your vacuum cleaner starts to behave strangely – for example, does not see a charging station, often stumbles on walls or “lost” in spacious rooms – with the probability of a high probability of a vacuum cleaner. 90% The manufacturer recommends cleaning them every time. 2-3 And you have to do this more often in a very dusty environment, like repairs or pets, and it's important to understand that not all sensors clean the same way, because laser lidar requires precision, and bumper contact sensors can be wiped with a more rigid tissue.

What sensors are in the vacuum cleaners Xiaomi and what they are responsible for

Before you start cleaning, let’s figure out what sensors are installed in the popular models Xiaomi Mi Robot, Viomi V3 or dreame D9. They can be divided into three main groups:

• 🔦 The laser sensor (LIDAR) is the main "eye" of the robot, which scans the room and builds a map, is under a rotating transparent cover on the top panel, and pollution of the lidar leads to "blindness" of the vacuum cleaner and chaotic movement.
• 🚪 Infrared sensors, which detect obstacles and edges (like stairs), are located around the perimeter of the body and on the bumper, and the dust on them prevents the robot from "seeing" walls and furniture.
• 📱 Optical sensors -- used to accurately navigate and determine the type of coating (carpet, laminate) that are located below, next to the brushes, and their contamination leads to the vacuum cleaner "can't see" dirt or misjudges distance.
• ⚡ The bumper sensors are the contact sensors that go off when you crash, and if they stick, the robot will hit obstacles instead of going around them.

In models with cameras (for example, DreameBot) L10s Ultra also has optical modules for object recognition, but cleaning them requires special care. Most of the problems with navigation are associated with laser lidar - if it is covered with a layer of dust, the robot begins to "lose" even in familiar rooms.

Xiaomi's manufacturer indicates in the instructions that bumper and IR sensors can be cleaned independently, but the disassembly of lidar is better entrusted to the service center. However, in practice, many users successfully clean lidar at home - the main thing is to follow the correct sequence and not use abrasive materials.

Signs Xiaomi vacuum cleaner sensors are contaminated

How do you know that the problem is sensors, not software or mechanical failures?

• 🌀 The robot moves on a chaotic trajectory, instead of the usual zigzag or spiral.
• 🏠 Can't find a charging station, though I've been back without any problems before.
• 🪑 Often bumps into furniture or walls, although previously skirted obstacles.
• 📉 In the Mi Home app, the room map became inaccurate or fragmentary.
• ⚠️ Errors such as Error 10 (lidar problem) or Error 12 (sensor pollution) appear).

A critical sign is that the robot begins to "draw" the map again every time it turns on, even though it used to store it in memory, which suggests that the laser sensor cannot properly scan the room due to contamination of the lens or mirrors inside the module.

⚠️ Note: If Xiaomi vacuum cleaner still behaves strangely after cleaning the sensors, check Settings → Map. → Reset the card in the app. Sometimes it helps to reboot the device (hold the power button for 10 seconds).

In models with a gyroscope (for example, Viomi) V2 Pro) sensor contamination can lead to the robot being pulled aside, moving off a straight line even on a flat surface, because optical sensors misread motion data.

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Before cleaning the sensors, check if something is blocking them from the outside, such as stickers on the case or a thread accidentally hit by the bumper can simulate contamination.

Step-by-step: how to clean the sensors of the vacuum cleaner Xiaomi

For cleaning, you will need:

• 🧴 Alcohol napkins (70-90%) oropropyl.
• 🧼 Cotton swabs (better with a plastic rod).
• 🪄 Soft brush (for example, for makeup).
• 💨 Compressed air container (optional).

Important: Before starting work, disconnect the vacuum cleaner from the charging station and remove the battery (if possible in your model) this will prevent accidental switching on during cleaning.

Cleaning of the laser sensor (lidar)

Lidar is the most sensitive element. You can't clean it with dry wipes or paper because it scratches the lens.

1. Carefully scroll the top transparent counterclockwise lidar cover to remove it.
2. Blow dust from the internal mirrors with a spray of compressed air (hold it vertically so that no liquid is splashed).
3. With a cotton swab soaked in alcohol, wipe the lens (don't press!) and mirror surfaces.
4. Let me dry. 2-3 minutes before assembly.

For models with a camera (e.g. DreameBot) L10s): wipe the lens with only a microfiber wipe without alcohol, so as not to damage the coating.

Cleaning of IR sensors and bumper sensors

Infrared sensors are located around the perimeter of the housing, and you can clean them more rigidly.

• Wipe all the holes on the bumper with a cotton swab with alcohol.
• Remove dust from the cracks with a brush.
• Check the bumper’s mobility – it should be easy to press and return to the original position.

If the bumper is "stuck" due to dirt, gently wash it with soap solution and dry.

Cleaning of optical sensors (bottom)

Turn the vacuum cleaner over and inspect the bottom:

• Find small, transparent windows next to the brushes -- these are optical sensors.
• Wipe them with a cotton swab soaked in alcohol.
• Make sure there are no hair or threads in the holes.

Do not use metal objects for cleaning – they can scratch the sensors.

Lidar rotates freely, without creaking|Infrared sensors are not covered by dust|The bumper presses and returns smoothly|The optical sensors below are clean and transparent|Robot builds map correctly in the application-->

What not to do when cleaning sensors

Some actions can damage the sensors permanently, and this is strictly forbidden.

• 🚫 Use acetone, gasoline or other aggressive solvents – they destroy plastic and rubber seals.
• 🚫 Blow into sensors with the mouth – saliva contains fats that leave the film on the lenses.
• 🚫 Cleaning lidar with dry cloth - this leads to micro scratches.
• 🚫 Disassemble sensors by force – in most models they are not designed for user disassembly.

Also, do not clean the vacuum cleaner under running water - even if the case is sealed, moisture can get into electronic components through microcracks.

⚠️ Note: Xiaomi Mi Robot Vacuum-Mop 2 The Pro and newer lidar have a protective coating on the lens, and if it's damaged, the sensor will have to be changed completely (cost). ~3000-5000₽).

If the robot gets worse after cleaning (for example, it starts to "see" obstacles where there are none), then you accidentally shifted the optical sensors, in which case only calibration through the service menu or resetting will help.

How often to clean sensors: recommendations for different conditions

The cleaning frequency depends on the intensity of the vacuum cleaner and the conditions in the house.

In models with automatic washing (for example, DreameBot) W10) sensors get polluted faster because of moisture. 20-30% more often than in dry vacuum cleaners.

Tips for the lazy: If you don't want to clean the sensors manually, use a vacuum cleaner with a self-cleaning function (for example, Xiaomi Mi Robot Vacuum-Mop 2 Ultra). It automatically wipes the lidar after each cleaning, but even in this case, once every six months, it is worth doing a deep cleaning.

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Regular cleaning of sensors extends the life of the robot vacuum cleaner 30-40%. Contaminated sensors cause the device to work at the power limit, which leads to overheating and wear of the battery.

What to do if the sensors do not work after cleaning

If the robot continues to go blind or behaves strangely, check the following:

• 🔄 Reboot the vacuum cleaner (hold the power button) 10-15 seconds).
• 📱 Update the firmware through the Mi Home app – sometimes bugs in the software simulate sensor malfunction.
• 🔧 Check the lidar mount - if it dangles, the mirrors inside shift and the scan becomes inaccurate.
• 🔍 Inspect sensors for mechanical damage (cracks, chips).

If nothing helps, there may be a problem with the electronics. V3 Sensor control board often fails - in this case, only repairs in the service center will help.

Diagnosis through the annex:

1. Open Mi Home → Choose your vacuum cleaner.
2. Go to Settings. → Status of the device.
3. Check if there are any errors such as Sensor Error 03 (bumper problem) or Error 10 (lidar).

⚠️ Note: In Xiaomi vacuum cleaners older than 2019 (e.g. Mi Robot Vacuum 1), the sensors are less protected from moisture.If you cleaned them with a wet wipe, let the device dry for at least 12 hours before turning on.

Prevention: How to protect sensors from rapid contamination

To clean your sensors less often, follow these tips:

• 🧹 Regularly remove dust from the top panel of the vacuum cleaner with dry soft cloth.
• 🚫 Do not put the vacuum cleaner under direct sunlight - this spoils optical sensors.
• 🐾 Clean your brushes and filters after each cleaning – this reduces the amount of dust that gets on the sensors.
• 🔋 Store the vacuum cleaner at the charging station in a dry place, away from batteries and heaters.

For models with laser lidar (for example, Xiaomi Mi Robot Vacuum-Mop P), you can use a protective film on a transparent cover, which prevents scratches and reduces the amount of sedimentation dust.

Myths about cleaning sensors:

• ❌ "The more often you clean, the better – in fact, too frequent cleaning with alcohol can erode plastic.
• ❌ "You can brush with a toothbrush" - hard bristles scratch the lenses.
• ❌ "The vacuum cleaner will alert the sensors to contamination itself – many models will silently fail until it’s too late.

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If you have a lot of long-pile carpets in your house, put transparent tape on the optical sensors on the bottom (for example, for paperwork), which will protect them from getting villi, but will not interfere with work. Change the tape once in a while. 1-2 month.

FAQ: Frequent questions about cleaning Xiaomi vacuum cleaner sensors