The “Not Enough Water” Error in Xiaomi’s Robot Vacuum Cleaner: Causes and Solutions

You started cleaning, but the Xiaomi robot vacuum cleaner suddenly stopped with the message “not enough water”**? This error occurs in models with wet cleaning function – Mi Robot Vacuum-Mop 2 Pro, Xiaomi Dreame Bot W10, Viomi V3 and others. The reasons can be both trivial (forgot to add water) and technical (sensor or pump malfunction).

It's important to understand that the error is not always due to a real lack of water. Sometimes the system is mistakenly triggered due to contamination of contacts, a firmware failure or mechanical blocking of fluid supply. We have collected 7 proven solutions, from basic to complex, requiring disassembly of the device. If after reading the problem remains, you will know exactly what is going on and whether to contact the service.

1. Checking the obvious: water, tank and cover

Start with the basics, 60 percent of the time, the error disappears, and even if you think you have water in the tank, double-check.

• 💧 Water level: Optimum volume is 150-200 ml (for most models) If liquids are less than 50 ml, the sensor may not work. L10 Pro, for example, requires a minimum of 100 ml for proper operation.
• 🔌 The tank cover. Make sure it's tightly closed before you click. V2 Xiaomi SJY-01FM The lid has a micro-switch – if it fits loosely, the system “thinks” the tank is empty.

Also, check the tank itself for cracks or deformities, and if the tank is damaged, water can leak out, and the sensor detects the leak as no liquid, in which case the tank will need to be replaced (the articles for popular models are shown in the table below).

2. Cleaning of the water level sensor and contacts

The water level sensor is a small float mechanism or infrared sensor (depending on the model) that detects the presence of liquid in the tank, and over time it becomes contaminated with plaque, dust or detergent, which leads to malfunctions.

1. Remove the water tank and drain the remaining liquid.
2. Wash the tank with warm water with a mild detergent (such as Baby Line) to avoid abrasives.
3. Look at the bottom of the tank, where the contacts of the sensor are located, wipe them with a cotton swab dipped in alcohol.
4. If the sensor is float-type (a small plastic part is visible), blow gently into the hole to remove possible blockages.

For models with an infrared sensor (such as the Dreame Bot Z10 Pro), additionally check the transparency of the plastic "window" on the tank. If it gets cloudy, wipe it with a microfiber. The use of aggressive chemicals (vinegar, citric acid) to clean the sensors is prohibited - this can damage the sensor!

Problems with pump and water supply system

If there's water in the tank, the sensor is clean, but the error remains, the problem may be in the pump that pumps water to the napkin.

• 🔊 The robot makes unusual sounds (buzzing, gnashing) when trying to start wet cleaning.
• 💦 The napkin remains dry, although there is water in the tank.
• ⚡ The error appears 10-20 seconds after the start of cleaning.

To check the pump:

1. Remove the bottom cover of the robot (usually mounted on 4-6 screws).
2. Find a pump – this is a small plastic block with tubes (usually located next to the tank).
3. Check the integrity of the tubes and the lack of blockages. Blow them out if necessary.
4. Connect the robot to power and manually run the pump test (in the engineering menu or through the Mi Home app, if available).

If the pump does not pump water, but it hums, most likely, the motor has failed. In this case, you will need to replace the part (cost - from 800 to 2000 rubles depending on the model). For Xiaomi Mi Robot Vacuum-Mop P, the suitable pump has the article MSXJ02FM-001.

4. Reset settings and firmware update

Sometimes the "water shortage" error is caused by a software failure, which is true if the robot was previously working normally and the problem occurred after an upgrade or prolonged downtime.

• 🔄 Reboot. Hold the power button for 10 to 15 seconds until the robot turns off. Then turn it on again.
• 📱 Reset via app. In Mi Home, go to Device Settings → Reset. Once reset, you'll have to reset the maps.
• 🖥️ Update firmware. Check for updates in the app. For Dreame models, use Dreamehome's proprietary software.

If the robot is not updated via Wi-Fi, try flashing it manually through USB-OTG (see instructions for specific models on the 4PDA or Xiaomi Community forums).

⚠️ Warning: After resetting, the robot may temporarily lose communication with the base station (if any.

Mechanical malfunctions: valves and tubes

In Xiaomi's wet cleaning systems, water is fed to the napkin through a system of valves and tubes, and if they're clogged or damaged, the robot thinks there's no water, even though it's physically present.

To access the valves and tubes usually requires partial dismantling of the robot. If you are not confident in their abilities, it is better to contact the service - the cost of diagnosis starts from 500 rubles.

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Before disassembling, take a picture of the location of all the parts and wires, which will help to properly assemble the robot back.

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

If all of the above methods have not worked, the problem may be related to a malfunction of the motherboard, humidity sensor or other critical components.

• 🔥 The error appears even with a new, clean tank.
• 🛠️ The robot does not respond to resetting settings and flashing.
• 💸 Other errors are displayed on the display or in the application (e.g., Error 12 or Water Pump fault).
• 🔌 The problem arose after the fall of the robot or getting moisture on the board.

The cost of repairs in official service centers Xiaomi:

• Diagnosis - 500-1000 rubles.
• Replacement of the water level sensor is 1200-2500 rubles.
• Repair / replacement of the motherboard - 3000-6000 rubles.

If the robot is warranty-free, don't disassemble it yourself, it voids warranty obligations. For models older than 2 years, it's sometimes cheaper to buy a new tank or pump than to pay for a diagnosis.

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Before visiting the service, save the error log from the Mi Home app (Device log section).

7 Prevention: How to avoid future mistakes

To prevent the problem of “not enough water” from recurring, follow these recommendations:

• 🚰 Use the right water. Only distilled or boiled water, hard water shortens the life of sensors and pumps.
• 🧼 Wash the tank after each cleaning, which will prevent plaque and pools for bacteria.
• 🔋 Keep the robot empty, and if you leave the water for a long time, it stagnates and spoils the seals.
• 📱 Update your firmware. Newer versions often fix sensor bugs.

For models with automatic wipe washing (for example, DreameBot W10), additionally check the condition of brushes and filters - their clogging can indirectly affect the operation of the water supply system.

FAQ: Frequent questions