Why Xiaomi robot vacuum cleaner does not wash the floor: a complete malfunction diagnosis

Your Xiaomi Mi Robot Mop or Viomi robot vacuum cleaner suddenly stopped washing floors, even though yesterday he was able to clean the floors “excellently”? The problem is found in models of all generations – from the budget Mi Robot Vacuum-Mop 2 Lite to the flagship Xiaomi Robot Vacuum-Mop 2 Ultra. In 80% of cases, the malfunction is not due to a breakdown, but with banal operating errors or software failures.

In this article, we’ll look at all the possible reasons why a robot assistant refuses to wash floors, from clogged tubes to hidden settings in the Mi Home app. You will learn how to diagnose the problem yourself (including checking sensors and testing pumps), which manipulations will return functionality, and in which cases you can not do without a service center. S10+) — their "caprises" are often associated with incorrect calibration of the flow of fluid.

For convenience, we've compiled FAQ-A block with answers to typical user questions and added interactive widgets: a survey about your vacuum cleaner model, a checklist for diagnosis and spoilers with technical nuances. If after reading the article the problem remains – you will have a clear algorithm of actions to appeal in support of Xiaomi with an accurate description of the malfunction.

1. Checking of basic conditions: water, container and locking

Before you take apart the robot or look for hidden settings, make sure that the basic requirements for wet cleaning are met, and in 30% of cases the problem is solved at this stage.

• 💧 There's no water in the tank. Even if the tank is installed, check the fluid level -- some models, like Viomi. V3) block the moping mode at a volume below 100 ml. Also make sure that the water is not frozen (relevant for cold rooms).
• 🔌 The water container is not connected. Xiaomi robots detect the presence of the container through a magnetic sensor. If the container is crooked or the magnet is contaminated, the system does not see the water.
• 🚫 Moping blocking is active. The Mi Home app can enable vacuum cleaner only (Cleaning Settings) → Also check the physical button on the case (on Xiaomi models). STYJ02YM It's under the lid of the tank).
• 📱 Restrictions on cleaning area. in cleaning cards (Mi Home) → Map. → Zones) could have been banned from wet cleaning for specific rooms. Update the map or reset the zone settings.

If all conditions are met, but the robot is still not washing, go to the next section. S10) require additional check of the valve - it can become clogged with sediments when using hard water.

2. Blockages and mechanical malfunctions: pump, tubes, brushes

Mechanical blockages are the most common reason why Xiaomi's robot stops washing floors, and the water supply system consists of several nodes, each of which can fail:

1. The rough filter (located in a water tank) gets clogged with pile, hair and debris particles over time. How to clean: remove the filter, rinse under running water, and dry for 24 hours.
2. The water supply tube, in Viomi and Xiaomi models S10 The tube may be bent over or clogged with limestone plaque, blow it with compressed air (for example, a dryer in cold blowing mode).
3. If the robot makes uncharacteristic sounds (squeaking, squeaking), but the water doesn't come in, the pump probably jammed. Diagnostics: turn on the moping mode and listen, the working pump emits a uniform hum.
4. Spray nozzles: 0.5-1 mm diameter holes are easily clogged with dust, clean them with a needle or toothpick, removing the bottom cover beforehand.

⚠️ Warning: If the pump still doesn't work after cleaning, don't try to disassemble it yourself - Xiaomi models use sealed pumps with adhesive connections.

Check the water level in the tank.|Examine the rough cleaning filter|Blow the water supply tube|Clean the nozzles with a needle|Listen to the pump for extraneous sounds-->

3.Problems with sensors: water level, humidity, mop position

Xiaomi robots are equipped with several sensors that are responsible for the safety of wet cleaning, if even one of them is false, the system blocks the water supply.

• 📊 Water level sensor. It's in the tank. If it's contaminated or damaged, the robot thinks there's no water. How do you check: pour water to the maximum point -- if the indicator in the application hasn't changed, the sensor is defective.
• 💦 Wet sensors in Viomi models. V3 Xiaomi S10+ It tracks how wet the tissue is, if the tissue is too wet or dry, the cleaning is blocked, so you can replace the moping cloth with the original one. ZNMS01WM Xiaomi).
• 🔄 Mop position sensor, detects whether the napkin is properly installed, if the napkin is shifted or worn, the robot refuses to wash, check that the fabric is flat and fixed with latches.
• 🌡️ Temperature sensor: In some models, it blocks moping at lower temperatures. +5°C (Tube icing risk) Move the robot to a warm room for 30 minutes.

How to Reset Sensor Errors:

1. Open the Mi Home app.
2. Go to the Device Settings → Resetting errors.
3. Select Reset Cleanup Sensors (the name may vary depending on the model).
4. Reboot the robot by holding the power button for 10 seconds.

4. Software failures: firmware, application, settings

Moping problems can be caused by firmware errors, bugs in the Mi Home app or incorrect settings, especially after software updates – Xiaomi users S10 Often faced with “zero” water supply parameters.

Step 1. Check the firmware version:

• Open Mi Home → Choose your robot → Settings → About the device.
• Compare the version with the latest official (information on the website mi.com).
• If the version is outdated, update the firmware through Settings → Update of the PO.

Step 2. Reset the moping settings:

1. At Mi Home, go to Cleaning Settings → Washing regimen.
2. Choose Reset to Factory (or Restore Moping Settings).
3. Set the water supply level to Medium and start a test cleaning.

Step 3: Reinstall the Mi Home app:

Sometimes the crashes are connected to the cache of the application. Delete it, clear the data (in the phone settings) and install it again. After authorization, check if you have the ability to configure the mapping.

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If the Xiaomi robot after updating the firmware began to "glutch", try to roll back the software to the previous version. 4PDA and manually run through Mi Home (local update section).

5. Wear of consumables: fabric, brushes, seals

The consumables in Xiaomi’s robot vacuum cleaners are limited in resource, and the manufacturer recommends replacing them every 3-6 months, but many users forget this, leading to problems with moping.

⚠️ Attention: Using non-original consumables (especially moping fabrics) can cause pump failure. Cheap counterparts often have a different composition of fibers that clog injectors and tubes. Buy parts only labeled Xiaomi or Viomi.

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Replace the cloth for the puping every 3 months - even if it looks clean on the outside. Over time, the fibers lose their ability to evenly distribute water, leading to divorces on the floor and overloading the pump.

Hardware breakdowns: pump, control board, battery

If all the previous steps didn't work, the problem is probably the hardware, and let's look at the typical breakdowns and their signs.

• 🔧 Symptoms: robot buzzes, but water doesn't come in; error occurs E5. Solution: replacement of pump (cost of spare part - 1,500-2,500) ₽).
• 🔌 Control fee problems: Symptoms: robot does not respond to the moping commands, but vacuums normally. Solution: diagnostics at the service center (possible repair or replacement of the board).
• 🔋 Battery wear: Low charge (less than 20%) some models (Viomi) V2) They block the wet cleaning. Solution: battery replacement — LBXM01WM).
• 📶 Wi-Fi issues. If the robot doesn't sync with the app, the moping settings may reset. Solution: reconnect the device to the network.

How to check the pump yourself:

1. Remove the bottom cover of the robot (unscrew 4 screws).
2. Disconnect the water supply tube from the pump.
3. Pour water into the tank and turn on the moping mode.
4. If the pump does not come from water, but a noise is heard, the pump is faulty.

7. Features of models with automatic water supply

Xiaomi robots S10, S10+ viomi V3 They have an automatic water dosing system that requires a separate setup, and if the moping is not working properly (e.g., water is pouring too much or too little), follow these steps:

Calibration of water flow rate:

1. Make sure that the tank has enough water (at least 500 ml).
2. In the Mi Home app, go to Cleaning Settings → Washing regimen → Sizing.
3. Select the type of floor (laminate, tile, parquet) and start the process.
4. The robot will perform a test spraying - adjust the water level with a slider.

Setting up areas with different humidity levels:

In the cleaning cards (Mi Home) → Maps can be assigned a different water supply level for each room, such as the kitchen setting High and the bedroom setting setting Low, which will prevent sensitive surfaces from over-watering.

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If Xiaomi's robot S10+ Leaves the floors in the open, reduces water consumption by 20% of the recommended amount, and use distilled water to prevent lime plaque from forming in the tubes.

FAQ: Frequent questions about moping problems in Xiaomi robots