Robot vacuum cleaner Xiaomi Vacuum Mop does not wash the floor: all the reasons and how to fix it

Your Xiaomi Vacuum Mop (or Mi Robot Vacuum-Mop 2/Pro/2C/2 Lite) has stopped washing the floor but still vacuuming? Or refuses to do wet cleaning even though the water tank is full? This problem is more common among Xiaomi robot vacuum cleaners than it seems. 80% of cases are not due to breakdowns, but to banal operational errors or software failures. But how to distinguish a serious malfunction from a small thing that can be fixed in 5 minutes?

In this article, we will look at all the possible reasons why Xiaomi’s robot vacuum cleaner doesn’t wash the floor, from a clogged pump to errors in the Mi Home app. You will learn how to diagnose yourself, which settings to check first, and when to really contact the service. And for the most difficult cases, we have prepared step-by-step instructions with a photo and an error code table to help you more accurately determine the problem.

Spoiler: 6 out of 10 times, it's enough to clean the water supply valve or reset the settings to the factory, but there are more insidious reasons, like the wear and tear of the pump membrane after 1.5 to 2 years of active use, which few people know about. Let's get into order.

1. Checking the obvious: water, reservoir and settings

Before you take apart a robot or look for a breakdown, make sure that the problem isn't with the basics.

• 💧 It sounds silly, but 15 percent of the calls to the service are to blame for this item, so make sure the tank is filled with distilled or filtered water (a regular tap water can cause limestone to swell at the pump).
• 🔌 Incorrect tank installation: The contacts at the bottom of the tank must fit tightly into the connectors in the robot body, and if they become oxidized or contaminated, the robot will not recognize the presence of water.
• 📱 In Mi Home or Xiaomi Home, check that wet cleaning mode is activated. Sometimes after updating the firmware, the settings are reset.

Also note the type of flooring. Many Xiaomi Vacuum Mop models (like the 2 Pro or 2C) have a "Avoid carpets when washing" option. If it's on, the robot automatically turns off the water supply on the carpets. Check this in the Cleaning Settings menu → Modes → Wet cleaning.

⚠️ Note: If you use a non-original water tank (for example, from a third-party manufacturer), the robot may not recognize it due to mismatch of contacts or sensors.

2.Closure of the water supply system: how to clean the pump and hoses

The most common technical reason why Xiaomi Vacuum Mop doesn’t wash the floor is a clog in the water supply system.

• 🧂 Lime plaque (if you use hard water).
• 🧹 Garbage or dust trapped in the tank.
• 🛠️ Dried residues of detergent (if added to the water).

To clean the system, follow the following steps:

1. Remove the water tank and rinse it under warm water. Pay attention to the valve at the bottom of the tank - it often clogs.
2. Blow the water supply hose (a thin tube that runs from the tank to the pump) and you can use a medical pear or compressor to do this.
3. Check the pump (under the lid at the bottom of the robot) If the wash mode is not buzzing, it is likely to be clogged or broken.

Remove and flush the water tank | Check the valve at the bottom of the tank |Blow the water supply hose |Test the pump operation (should make a sound when the wash is activated) |Check the rough cleaning filter (if any)

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If the problem persists after cleaning, the pump membrane may have worn out, a rubber gasket that loses elasticity over time and ceases to create the necessary pressure, in which case a replacement pump will be required (parts can be ordered on AliExpress on request "Xiaomi Vacuum Mop water pump").

3.Sensor problems: why the robot can't see water

Xiaomi Vacuum Mop is equipped with several sensors that control the washing process:

• 💡 Water level sensor in the tank (detects that the tank is installed and filled).
• 🔧 Flow sensor (controls whether water enters the cloth).
• 📶 Pressure sensor in the pump (tracks its performance).

If one of them fails or gets contaminated, the robot can "think" that there's no water, and turn off the wash function.

Pay special attention to the contacts on the tank. Over time, they oxidize, especially if you use tap water. To clean, use a cotton swab dipped in isopropyl alcohol or contact cleaning fluid (for example, Kontakt 60).

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If the robot starts to "glut" after a fall or impact, check the water level sensor - it is the most fragile and often moves away from the board during mechanical impacts.

4. firmware errors and crashes in the Mi Home app

Sometimes the problem isn't hardware, it's software. Here are the typical scenarios:

• 📲 Synchronization failure between robot and application, for example, in Mi Home, it shows that wash mode is on, but the robot ignores it.
• 🔄 Failed firmware update: After the update, the robot may "forget" the wash settings or misinterpret commands.
• 🚫 Blocking a function due to an error (e.g. code) 10-12 — pump-problem).

To exclude programmatic reasons, follow the following steps:

1. Reset the robot. Press the power button for 10 seconds until you hear the beep.
2. Update your firmware through Mi Home. Path: Device Profile → Settings → Firmware Update.
3. Reset the settings to the factory. To do this, press the Home and Power buttons for 5 seconds (before the beep).
4. Reinstall the Mi Home app and log in again.

If the problem persists after the reset, check the error log in the application. Codes associated with the wash usually start with 10 (e.g., 10-01 - no water, 10-03 - a blockage of the pump).

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Reset to factory settings deletes all stored room maps! Before the procedure, make a backup copy to Mi Home (section "Maps").

5. Mechanical breakdown: wear and tear of parts and damage

If all the previous steps didn't work, it's probably the mechanical part of the problem.

• 🔧 Water pump. Over time, the membrane loses its elasticity, or the motor winding burns. Sign: the pump doesn't buzz when the washer is activated.
• 🧵 Tubes and hoses. They can rub or burst (especially if the robot gets stuck a lot.
• 🧽 If the holder is broken, the water will not be evenly distributed over the surface.
• 🔋 Pump control board: Short circuits or moisture can burn out a simistor or resistor.

To diagnose mechanical breakdowns, you'll need to disassemble a robot. Here's a brief instruction:

1. Unscrew 4 screws on the bottom cover (use the PH0 cross screwdriver).
2. Carefully remove the cover, starting from the back (there are latches).
3. Check the integrity of the tubes and contacts of the pump, and if you see oxidation or garnish, it's a sign of malfunction.
4. Test the pump directly by feeding it with 5V from the power supply (if it does not respond, a replacement is required).

Parts for Xiaomi Vacuum Mop can be found on AliExpress or in service centers. The average cost of replacing the pump is 1,500-2,500 rubles. (depending on the model).

⚠️ Warning: When disassembling a robot, don't touch the control board without an antistatic bracelet. Static electricity can damage the chips, and repairs will cost more.

External factors: temperature, humidity and detergents

Few people know, but the operation of the Xiaomi Vacuum Mop washing system is also influenced by external conditions:

• ❄️ Low temperature, if the room is lower +10°C, the water in the hoses can freeze, blocking the supply.
• 🌡️ High humidity. At humidity above 80%, sensors can give false positives, "thinking" that water is already in.
• 🧼 Inappropriate detergents: Aggressive chemicals (e.g. chlorine) destroy rubber seals and cause corrosion of the pump.

Operational recommendations:

• Use only specialized cleaning products for robot vacuum cleaners (e.g. Xiaomi Floor Detergent).
• Do not leave the water in the tank for long – drain it after each cleaning.
• Keep the robot in a room with a temperature of 15-30 ° C and a humidity of not more than 60%.

If the robot was used in non-standard conditions (for example, to wash the floor on an unheated balcony in winter), there is a high probability of damage to the sensors or the pump, in which case diagnostics will be required in the service.

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

If you’ve tried all the ways but the Xiaomi Vacuum Mop still doesn’t wash the floor, it may be a bigger problem than it seems.

• 🔥 On the control board, blackened or bloated elements (resistors, capacitors) are visible).
• 💦 The robot turns on the pump, but no water comes in and all the tubes are clean.
• 📵 The application shows unknown error codes (for example, the codes, 10-15 or 10-18).
• 🔌 The robot does not respond to buttons or does not turn on at all.

The average cost of repairs in official Xiaomi services:

Before you visit the service, back up your room maps in the Mi Home app and reset the robot to factory settings, which will speed up the diagnosis.

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If the robot is warranty-free, don't disassemble it yourself! The opening of the hull will void warranty obligations.

FAQ: Frequent questions about washing issues in Xiaomi Vacuum Mop