Why Xiaomi’s Robot Vacuum Does Not Supply Water During Wet Cleaning and How to Fix It

Your Xiaomi Mi Robot Vacuum-Mop or DreameBot robot vacuum cleaner has stopped spraying water during wet cleaning? The problem is with Xiaomi S7/S7 Pro, LDS 03, W10, D10 Plus and others — and there can be several reasons at once. From banal clogging of pipes to firmware failure or pump failure. In this article, we will analyze all possible malfunctions, from simple to complex, with step-by-step instructions for elimination.

It's important to understand that if the robot doesn't deliver water at all (even when it's manually run through the app), that's one problem: if the water drips poorly or unevenly, it's another. And if the vacuum cleaner stops wetting the cloth after the upgrade, that's the third scenario, and we'll look at each case separately so you don't waste time on unnecessary manipulation.

Before you disassemble the device, check the obvious: is there enough water in the tank (yes, sometimes users forget to add), is the wipe correctly installed (it should lie flat, without folds), and does not block a foreign object. If everything is fine, read on.

1.Clogging of the water supply system: how to clean pipes and filters

The most common cause is waterway pollution, and in tubes, valves and sprayers, lime plaque, dust and residues accumulate over time, especially in regions with hard water.

What to do:

• 🔍 Check the rough filter (usually located in a water tank) rinse it under running water, soak it in a vinegar solution (1:1 with water) for 30 minutes if it is severely contaminated.
• 🚰 Clean the water supply tube. Disconnect it from the pump (carefully, effortlessly!) and rinse with compressed air or rinse with a syringe of warm water.
• 💧 Clean the sprayers on the bottom of the vacuum cleaner. Use a toothpick or needle to remove plaque from the holes.
• 🧼 Wash the entire water circuit. Pour a solution of citric acid (2 tbsp. spoons per 0.5 l of water), turn on the wet cleaning mode for 5 minutes, then rinse thoroughly with clean water.

If the water still does not go after cleaning, the problem may be in a jammed valve or a faulty pump - we will talk about this in the following sections.

2. Pump malfunction: how to check and replace

The pump is the key node of the water supply system, and if it doesn't pump the fluid, wet cleaning becomes impossible.

• 🔇 The robot hums, but the water does not go (the pump works idle").
• 💦 Water drips weakly and unevenly, despite clean tubes.
• ⚡ Mi Home App App Apps Error 12 or Water Pump Fault.

How to diagnose:

1. Remove the bottom cover of the vacuum cleaner (usually attached to 4-6 screws).
2. Find a pump - it's a small plastic block with connected tubes.
3. Unplug the tubes and apply to the pump 5V directly (through a power supply unit or USB-The working pump must beep and start pumping water.

If the pump does not respond:

• 🔧 Check contacts and wires for oxidation or breakage.
• 🔄 Try to reflash the robot (instructions in section 5).
• 🛒 If the pump is burned, replace it. S7 pump-proof MDY-05-5V, for DreameBot — W200-5V. Cost: 800–1500 ₽.

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

Xiaomi’s robot vacuum cleaners have water and humidity sensors installed, and if they are contaminated or faulty, the device can “think” the tank is empty and block the water supply.

Typical symptoms:

• 🚫 The app displays No water, although the tank is full.
• 🔄 The robot starts cleaning, but stops after 10 seconds.
• 💡 Error indicators are on (for example, a red flashing LED).

How to fix:

1. Clear the sensors: 🧴 Wipe the contacts of the water level sensor (located in the tank) with a cotton swab soaked in alcohol. 🧽 Clean the humidity sensor (located under the napkin) from plaque and dust.

Check the density of the tank adjoining

Reset the settings.

Mi Home

Device Profile → Settings → Resetting settings

⚠️ Warning: Do not use abrasive materials (steam, hard brushes) to clean the sensors, this will damage the sensitive elements.

4. firmware failures and software errors

After updating the firmware, many users find that the robot stops spraying water when everything is mechanically working, most often because of:

• 🐛 Bugs in the new version of the software (especially relevant for firmware) 3.5.8_003076 and 4.2.1_000421 Xiaomi S7).
• 🔄 Incomplete update (if the process is interrupted).
• 📱 Conflict with the Mi Home app (for example, after changing the account region).

How to fix it:

1. Reboot the robot: Press the power button for 10 seconds. Turn the vacuum cleaner off the grid for 1 minute, then turn it back on.

Firmware rollback

Reset the settings to factory.

Appendix: Device Profile → Tripos (⋮) → Resetting

If the water is still not running after the reset, try linking the robot to another Mi Home account or installing alternative software (for example, Valetudo for advanced users).

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Before updating your firmware, always check reviews on forums (such as 4PDA or Reddit). If users complain of water bugs, wait for the update.

5. Mechanical breakdowns: cracks, wear of parts

Over time, the plastic parts of the water supply system wear out or break down, and most often, the following suffer:

• 💔 Pipes – crack or fall off the fasteners.
• 🔗 Connecting fittings - loosen and let air through.
• 🛠️ Water supply valve - jams in the closed position.

How to diagnose:

1. Remove the bottom cover and inspect all the tube connections. They should be tightly fitted to the connections.
2. Check the integrity of the tubes – even a microcrack can disturb the vacuum.
3. Press the valve manually (usually located next to the pump) if it doesn't click, you need to replace it.

Repair:

• 🔧 Cracks in the tubes can be temporarily sealed with silicone glue, but it is better to replace the tube completely (article for Xiaomi) S7 — XMSH03WM-001).
• 🔄 Pull up the shattered fittings with pliers or replace them with new ones.
• 🛒 The valve is usually assembled with a pump, so it is easier to replace the entire unit.

6. Problems with the water tank: cracks and loose fit

Water tank - it would seem, a simple detail, but here there may be nuances:

• 💧 Cracks in the tank. → Water leaks, sensor shows empty tank.
• 🔳 Wear of sealing gum → The tank is not tightly attached, the protection is triggered.
• 🧲 Magnetic sensor (in some models) is biased or contaminated.

How to check:

1. Examine the tank for cracks (especially in the places where the tubes are attached).
2. Check the sealing gum - it should be elastic, without tears.
3. Make sure the tank is firmly in place (a click should be heard).

Decisions:

• 🛠️ Cracks in the tank can be sealed with epoxy resin, but this is a temporary measure. It is better to replace the tank (price: 1000-2000). ₽).
• 🔄 The sealing gum can be lubricated with silicone lubrication or replaced (article: XMSH04WM-003).
• 🧲 If the problem is in the magnetic sensor, clean it of dust or replace it (cost: 200-400). ₽).

⚠️ Note: If you use a non-original tank (for example, from a third-party manufacturer), it may not work with Xiaomi sensors.

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

Not all problems can be solved by yourself. Contact the service center if:

• 🔥 Robot smells like a smoke when the pump is turned on.
• ⚡ On the board, burned elements are visible (blackened resistors, swollen capacitors).
• 💻 Error 18 or Mainboard fault in the app.
• 🔧 You’ve already replaced the pump and sensors, but the problem remains.

Cost of repair in the service:

If the robot vacuum cleaner Xiaomi after a fall or impact stopped supplying water, do not try to repair it yourself! In 80% of cases, this leads to damage to the control board, and the cost of repair increases by 2-3 times.

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Before visiting the service, reset the robot to the factory and check its operation on standard firmware. This will eliminate software errors and save you time and money.

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