Why the water is not in the robot vacuum cleaner Xiaomi: a complete guide to troubleshooting

Your Xiaomi robot vacuum cleaner stopped supplying water during cleaning, even though the tank is full and all settings are correct? This problem occurs in models with wet cleaning function — Viomi V2/V3, Mi Robot Mop 2 Pro, Dreame W10 and others. Most often, clogs, faulty pumps or software errors are to blame. In 80% of cases, the problem can be fixed on your own without going to the service center.

In this article, we'll look at all the possible reasons why water doesn't flow to a cloth or is sprayed unevenly, from the commonplace clogging of the filter to the breakdown of electronic components. You'll learn how to check each node of the robot, what tools you'll need for repair, and when to contact specialists. We've also compiled a table of common errors with codes and solutions that are relevant for firmware from 2023 to 2026.

1. Checking for obvious reasons: what to do first

Before disassembling the robot, eliminate the simplest problems that users often miss:

• 💧 Even if you think the tank is full, check the fluid level, sometimes the sensor will show false values due to air in the system.
• 🔋 At a charge level below 15%, many Xiaomi models block the water supply to save energy.
• 📱 Inactive wet cleaning mode: In the Mi Home or Dreame app, check if wet cleaning is enabled (sometimes reset after a software update).
• 🔌 Contaminated contacts of the tank. There are metal plates at the bottom of the tank that oxidize over time -- wipe them with an alcohol napkin.

If you don't get it, you can go to the water system diagnostics, and start by visually inspecting the hoses and filters, which is where the dirt most often accumulates.

2.Clogging system: how to clean hoses and filters

The main reason for the lack of water is clogged channels, and in Xiaomi robots, water passes through several nodes, each of which can become clogged:

1. A rough cleaning filter (mesh in the tank) - retains hair, threads and large debris.
2. A thin filter (usually a white foam cylinder) blocks small particles.
3. The supply hose - bends and can be clamped or clogged with lime plaque.
4. Spray nozzles are holes with a diameter of 0.5-1 mm, which are easily clogged.

To clean, you'll need a toothpick, a soft brush, a vinegar solution (1:1 with water), and a compressor (or a can of compressed air).

Remove the tank and drain the water.|Remove the filters and rinse them under running water|Blow the hose with a compressor (direction - from the tank to the nozzles)|Soak the nozzles in vinegar solution for 15 minutes|Check the tightness of the joints (there should be no cracks)-->

Attention! Do not use needles or metal objects to clean the nozzles, this will damage the plastic and enlarge the holes, leading to uncontrolled water spraying and leaks.

3. Failure of the pump: how to check and replace

If the water doesn't flow even after cleaning, the problem may be in the pump, which is responsible for creating pressure in the system.

• 🔊 The robot makes a buzz, but the water is not sprayed.
• ⚡ An error appears on the display or in the application E10, E12 Water Pump Error.
• 💦 When manually checked, the hose is dry, although the tank is full.

For diagnosis:

1. Remove the bottom cover of the robot (usually mounted on 4-6 screws).
2. Find a pump – it is a small plastic block with two tubes (in/out).
3. Unplug the hoses and connect the pump directly to the 5V/12V power source (depending on the model).

The cost of a new pump for Xiaomi Viomi – 800-1500 ₽, for Dreame - 1200-2000 ₽. Replacement takes 15-20 minutes with a screwdriver and soldering iron (sometimes you need to resweeten the contacts).

4.Problems with electronic boards and sensors

In 10 to 15 percent of cases, water is not supplied due to a control board failure or sensor failure.

You'll need a multimeter to diagnose the board.

• 🔌 Stress on the pump contacts (should be) 5V or 12V tidy-up).
• 📡 Signal from the water level sensor (with an empty tank — 0V, full-on — 3.3V).

If you don't have any experience with electronics, don't try to repair the board yourself. A short circuit can knock out the entire robot, and the cost of a new board is as high as 5,000 to 7,000. ₽.

5. Firmware errors and resetting settings

After the software update, many users are faced with the fact that the Xiaomi robot stops spraying water, this is due to bugs in the firmware, especially for Viomi models. V3 (version 3.5.4_0050 and 3.5.8_0070).

How to get back to work:

1. Reset settings through the application: Device Profile → Settings → Reset to factory
2. Remove the firmware to a stable version (for example, 3.5.4_0030 for Viomi V3). Download the archive with firmware from the site mi-firmware.xiaomi.ru. Unpack the file.pkg in the root SD-Put the card in the robot and hold the Home button. 5 seconds.

Turn off cloud syncs

Xiaomi

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Before rolling back the firmware, back up the cleaning card in the Mi Home app. Once reset, it can be restored via Settings → Map → Import.

Mechanical breakdowns: cracks, wear of parts

If the robot has been in use for a long time (more than 2-3 years), the problem may be in the physical wear of the components:

• 🔧 Hose cracks – over time, plastic becomes brittle, especially if the water was hot.
• 🧽 Deformation of rubber seals - leads to air suction and pressure drop.
• 🔄 Wear of pump gears – the pump works, but does not create enough pressure.

To verify:

1. Remove the tank and inspect the hoses for cracks (use a flashlight).
2. Check the sealing rings – they should be elastic, without tears.
3. Scroll the pump shaft manually: if you feel a backlash or creak, the gears are worn out.

Replacement of hoses will cost 200-500 ₽, sealants - 100-300 ₽. The pump gears are not usually sold separately, so you have to change the entire pump.

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If the robot fell from a height or was subjected to severe vibrations (for example, during transportation), first check the mechanical connections.

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

Not all faults can be fixed by yourself. Contact the service center if:

• 💥 Robot sparkles or smells of a burn when switching on the pump.
• 🔥 On the board, blackened elements are visible (burnt resistors, capacitors).
• 💻 After firmware, the robot does not turn on or hangs on the logo.
• 🚰 Water flows inside the body (risk of short circuit).

Cost of diagnostics in official Xiaomi services – 500-1000 ₽, repair (depending on the breakdown) - from 1500 ₽. Average prices for replacement of components:

If the robot is warranty, do not disassemble it yourself - this cancels the manufacturer's obligations. Xiaomi has a warranty of 12 months for mechanical parts and 6 months for consumables (filters, brushes).

FAQ: Frequent questions about water supply in Xiaomi robot vacuum cleaners