Xiaomi vacuum cleaner does not wash the floor: a full analysis of causes and solutions

Your Xiaomi robot vacuum cleaner stopped washing floors, even though it was doing a great job yesterday? The problem is with Mi Robot Vacuum-Mop 2 Pro, Xiaomi Mi Robot Vacuum-Mop P and other hybrid devices in the series. 80 percent of the time, the malfunction is not due to a breakdown, but to a simple error of operation or a clogging system. But how do you tell a temporary malfunction from a serious malfunction?

In this article, we will explore all the possible reasons why Xiaomi robot does not wash the floor – from blockages in the tubes to firmware errors, you will learn how to diagnose the problem yourself, which manipulations are worth trying first, and in which cases it is better to contact the service. Special attention will be paid to models with automatic water dosing function (Xiaomi). S7, S7 Pro where pump or sensor problems are most common.

We warn you right away that if your robot stops washing the floor after falling or hitting, there is a high risk of mechanical damage to the tank or electronics, in which case you can not do without disassembly. In all other situations, you can solve the problem with your own hands in 10 to 30 minutes.

1. A clog in the water supply system is the most common cause

In 60 percent of cases, Xiaomi's robot doesn't wash the floor because of a clog in the pipes, filters, or nozzle of the water supply. Dust, hair, and lime plaque accumulate in narrow channels, blocking the flow of liquid. Especially in regions with hard water, mineral deposits clog the system in 2-3 months of regular use.

How to check:

• 🔍 Look at the water tank, remove it, and see if the water leaks out when you tilt it, and if the liquid is barely dripping, there's a clog in the outlet.
• 🧹 Rinse the feed tube: disconnect the hose from the tank and blow it (you can use a medical pear).
• 🚰 Check the filter: in Xiaomi models S7/S7 Pro has a mesh filter in front of the pump - it must be washed under running water once a week.
• 💧 Lime plaque test: if after washing the water still does not go, soak the parts in a solution of vinegar (1: 1 with water) for 1 hour.

⚠️ Warning: Never use metal objects (needles, wire) to clean, as they can damage silicone seals. For hard-to-reach areas, a toothpick or plastic spatula will do.

Failure of the pump or water supply valve

If the system is clean, but Xiaomi's robot is still not washing the floor, the problem may be in the pump or the electromagnetic valve, which are responsible for creating pressure and metering water supply.

• 🔊 The robot emits an uncharacteristic squeak or hum when trying to wash.
• 💦 There's no water coming in at all, but the tank is full.
• 🔋 The device suddenly shuts down when the washing mode is activated.

How to diagnose:

1. Turn on the washing mode and listen: if the pump does not make any sounds, most likely, the problem is in the electrical part (chain break, burnt motor).
2. If the pump is buzzing, but the water does not go - a clog in the valve or wear of the membrane (relevant for Xiaomi models) STYJ02YM).
3. Check the contacts on the control board – oxidation or corrosion can interrupt the signal to the pump.

⚠️ Note: If you don't have experience with a soldering iron, don't try to repair the control board yourself. Xiaomi models often use chips with a different set of chips. BGA-stains that are easily damaged by overheating.

3. firmware errors or settings failure

Software failures are the third most common reason why Xiaomi's robot doesn't wash the floor, especially after firmware updates or resets. 2 Lite is known for a bug in which the device “forgets” washing options after upgrading to the version 3.5.8_002014.

How to fix it:

• 🔄 Reset to factory settings: press Home and Power buttons for 5 seconds (for different models, the combination may differ).
• 📱 Update your firmware through the official Mi Home app: go to Device Settings → Update of the PO.
• 🔧 Check washing modes: sometimes users accidentally turn off the wash function in the settings (Cleaning tab) → Parameters for washing).
• 📡 Reconnect the robot to Wi-Fi: network failures can block synchronization of settings.

If the robot doesn't wash after reset, try rolling back the firmware to the previous version.

1. Download the archive with firmware from the official Xiaomi website (the support section of your model).
2. Unpack the file and rename it to fw_update.bin.
3. Place the file in the microSD card root directory (if your model supports the upgrade from the memory card).
4. Insert the card into the robot and hold the power button for 10 seconds.

4.Problems with sensors: humidity, water level, obstacles

Xiaomi robots are equipped with several sensors that affect the washing process:

• 💧 The water level sensor detects the amount of liquid in the tank, and if it's contaminated or faulty, the robot thinks it's empty.
• 🌡️ Humidity sensor - in models S7 Pro controls the moisture of the cloth, and can block the water supply if it fails.
• 🚫 Obstacle sensors – if the robot “sees” an obstacle (such as a carpet), it automatically turns off washing.

How to check the sensors:

1. Water level sensor: remove the tank and examine the contacts on the bottom. Rub them with alcohol - oxidation can give false signals.
2. Humidity sensor: in models with automatic humidity control (Xiaomi) STYTJ01ZHM) remove the bottom cover and check the wires going to the sensor under the cloth.
3. Obstacle sensors: run the robot in wash mode on a flat surface without carpets, and if the washing goes on, the problem is the coating recognition settings.

⚠️ Attention: In Xiaomi models S5/S6 The humidity sensor is located under a cloth tray, and if it's contaminated, the robot can only turn on washing on the floor. 5–10 Clean the sensor with a soft brush soaked in isopropyl alcohol.

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If Xiaomi robot refuses to wash the floor on carpets, check the settings in the Mi Home app: go to Cleaning Settings → Types of coatings and disable the option "Avoid carpets when washing".

Mechanical damage: tank, rag, fastenings

Sometimes the problem is physical damage to the components of the washing system, most often:

• 🧺 Washing cloth: If it is torn, worn out or improperly installed, the robot will not be able to evenly distribute the water.
• 💼 Water tank: cracks or deformations of the housing lead to loss of tightness and malfunctions in the pump.
• 🔗 Pipe fastenings: if the hose has moved away from the connector, water will pour past the pallet.
• 🛠️ Pallet for rags: in models Xiaomi Mop 2 Pro pallet can be shifted due to wear of guides.

How to diagnose:

1. Remove the cloth and examine it for holes or grated areas, and normally the cloth should be evenly wet after cleaning.
2. Check the tank for leakage: fill it with water and leave it on a dry surface. If after 5 minutes drops appear, there is a crack.
3. Make sure the tube sits tightly in the connectors. STYJ02YM Fixers often break down after 1-2 years of operation.

If you find a crack in the tank, don't try to seal it with sealant - this is a temporary solution. 90% of the time, the crack will appear again in 1-2 weeks. S7 — ZNMS17WM).

6. Problems with battery or power

Insufficient battery power or power supply faults can cause Xiaomi to turn on the wash for only a few seconds or ignore the command altogether, because the pump and valve consume additional energy, and when the charge is low, the device goes into "economic mode".

Signs of nutritional problems:

• 🔋 Robot shuts down 1-2 minutes after washing starts.
• 🔌 When connected to the charging station, the indicator flashes red, but charging does not go.
• ⚡ Mi Home app shows battery error discharged, even though robot just was on base.

How to check:

1. Connect the robot to charge and wait for 100% charge. Then start washing, if the problem disappears, the battery was dead.
2. Check the contacts on the charging station and robot: oxidation or contamination can interfere with normal charging.
3. If the robot is not holding charge, measure the battery voltage with a multimeter. The norm for the Li-ion battery Xiaomi - 16.8 V (full charge). If the value is below 12 V, it is time to change the battery.

⚠️ Attention: In Xiaomi models S5 Max and later use a battery-cell balancing system, and if one of the cells fails, the robot can behave unstable, so it can wash the floor, then not. B6).

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If Xiaomi has stopped washing the floor after a long period of downtime (more than 3 months), first perform 3-4 cycles of full battery discharge/charging, which will help restore the capacity and reset the errors of the power controller.

7.When to contact the service: signs of serious malfunctions

Not all problems can be solved by yourself. Contact Xiaomi Service Center if:

• 💥 Robot emits metal grinding when trying to wash - this is a sign of failure of the gears of the pump.
• 🔥 From the device comes the smell of burning - burned the winding of the engine or control board.
• 💻 An error is displayed on the robot screen or in the application E10, E11 or E15 — These codes indicate a malfunction of the water supply system.
• 🛠️ After falling from a height, the robot does not turn on or works intermittently.

The cost of repairs in official Xiaomi services (for 2026):

Before the service visit:

1. Make a backup of the cleaning cards in the Mi Home app (if the robot is still turned on).
2. Shoot a video demonstrating the problem - this will help the wizard quickly diagnose the malfunction.
3. Check by phone if the service has original spare parts for your model.

FAQ: Frequent questions about problems with floor washing