Xiaomi robot vacuum cleaner doesn't do wet cleaning - all causes and solutions

Does your robot vacuum cleaner Xiaomi properly collect dust but refuses to wash floors? Or does it turn on wet cleaning but leaves the surface dry? V2/V3, Dreame D9 And other devices in the Xiaomi ecosystem, and it's not the mechanical breakdowns that are most often to blame, but the setting errors, the clogs, the wear and tear of the consumables. 80% In cases, you can eliminate the malfunction yourself - without contacting the service center.

In this article, we'll look at all the possible reasons why the robot stopped wet cleaning, from the trivial lack of water in the tank to firmware failures. You'll learn how to diagnose a problem by error codes, what parts need to be replaced, and what to do if the robot washes floors once or leaves a divorce. For convenience, we've compiled step-by-step photo instructions, a consumable compatibility table, and answers to frequent user questions.

1. Check for obvious reasons: water, cloth, cleaning mode

Start with basic checks, and often the problem is the little things that users don't pay attention to.

• 💧 Make sure the tank is full before the mark. MAX. In Viomi models V3 dreame Z10 Pro level sensor may work prematurely – try to add water even if the indicator is green.
• 🧻 The condition of the washing wipe. The cloth should be clean, free of lumps and foreign objects. If you use reusable cloth, check it for wear and tear, over time, the microfibre loses its absorbent properties.
• 🔄 Wash mode activated. In the Mi Home or Dreame app, go to Cleaning Settings → Mode and make sure you select the option "Wet cleaning" or "Washing" + vacuumer".
• 📱 Zone restrictions: The cleaning map may have kept "no-go zones" for washing (such as carpets). → Editing → Cleaning areas.

If Xiaomi's robot turns on the water pump (there's a characteristic buzzing sound), but the floor remains dry, the problem could be a clogged tube or a pump malfunction.

2. Blockages and mechanical malfunctions: pump, tubes, valves

Xiaomi’s wet cleaning system consists of several key elements: an electric pump, silicone tubes, a switch valve, and a detergent module, all of which can fail or clog.

How to diagnose:

1. Check the pump. When you turn on the wash mode, you should hear the sound of the pump running (quiet buzzing). If it's not there, maybe the motor burned or the contact broke. V3 pump is located under a removable cover next to a water tank.
2. Blow the tubes. Disconnect the hoses from the tank and the detergent, then blow them out (you can use a bicycle pump), and if the water doesn't pass, the tubes are clogged with limestone or dust.
3. Inspect the valve. In some models (e.g. Dreame) D9) And you have an electromagnetic valve that opens the water supply, and if the valve breaks, the robot will think it's washing the floor, but the water won't come in.

⚠️ If Xiaomi robot makes a mistake E3, E5 or E9 — This indicates a problem with the water system. E9 In Viomi models, it often means breaking the pump circuit or shorting the washing module.

3. Wear consumables: when it is time to change the cloth, filters and seals

Xiaomi manufacturers recommend changing consumables every time 3-6 However, many users forget this, which leads to a deterioration in the quality of cleaning:

• 🧽 Washing wipes. Even if a rag looks clean, its microfibre eventually loses its ability to hold water. WXCBC01ZM origen.
• 🔄 Fine cleaning filter: A clogged filter increases the load on the pump, which can cause it to break. Rinse the filter under running water once a week, replace it every 6 months.
• 💧 O-rings. The rubber bands on the water tank and the tubes eventually tan and let the water through. The sign of wear is the drips under the robot during cleaning.
• 🔋 Brushes and rollers. Although they don't directly affect the wash, worn-out brushes can block the robot from moving, interrupting the cleaning cycle.

💡 Use distilled water for wet cleaning, this will prevent lime plaque from forming in the tubes and pump. In regions with hard water, you can add special softening tablets (for example, Xiaomi Mi Water Softener).

⚠️ Warning: Do not use household chemicals with aggressive surfactants (such as Domestos or Whiteness) – this will lead to the destruction of silicone parts. Only specialized cleaning products for robot vacuum cleaners (such as Dreame Floor Cleaner) are allowed).

4. firmware failures and application errors: how to reset settings

If the mechanical part is fine, but Xiaomi's robot stubbornly ignores the wash mode, the problem may lie in the software.

• 📱 Synchronization failure between robot and Mi app Home/Dreame. For example, the settings may display wash mode, but in fact the robot does not activate it.
• 🔄 Outdated firmware. Early versions of Viomi software V2 There was a bug that caused the robot to “forget” to turn on the pump after the reboot.
• 🚫 Conflict with other devices in the Xiaomi ecosystem, for example, if the robot is connected to the Xiaomi Smart Speaker, voice commands can block manual settings.

How to fix it:

1. Reset the robot. Press the power button for 10 seconds until you hear the beep. This will reset the time errors.
2. Update your firmware. In the app, go to Device Settings. → Software update. For Dreame. D9 current-age 2026 year — 3.5.9_2136.
3. Reset to factory settings. In Mi Home, select Settings. → Additionally. → Reset. Then you'll have to reset the map.
4. Reinstall the app. Delete Mi Home, clear the cache, re-install it. Sign in and sync the robot.

If after reset, the Xiaomi robot stopped responding to commands at all, check if the Wi-Fi settings have gone wrong. In some cases, reconnecting to the network through mode helps. AP (Hold the buttons Home. + 5 seconds power).

5. Control board and sensor failures

If all the previous steps didn't work, the problem could be electronics, and Xiaomi robots are responsible for controlling the sink:

• 📌 Main board (motherboard) – handles commands from the application and sensors.
• 💡 Water level sensor – if it fails, the robot “thinks” the tank is empty.
• ⚡ The pump mosphet is a transistor that feeds power to the pump. When the mosphet breaks, the pump doesn't turn on.
• 🔌 Power connectors – oxidation of contacts can interrupt the supply of voltage.

Diagnosing electronics requires disassembling the robot and minimal multimeter skills, and this is what you can test for yourself:

1. Call the pump circuit. Disconnect the pump connector and measure the resistance between the contacts — 20-50 Oh, if he does. 0 (short-circuit) or ∞ (cliff, pump malfunctioning.
2. Check the pump power. When the wash mode is on, the voltage on the pump connector should be 5-12 B (depends on model) If there is no voltage, the problem is the board or the wires.
3. Look at the water sensor. It's in the tank, and it's two metal plates, and clean them from the stain of alcohol.

⚠️ Attention: If you are not sure about your skills, do not take risks - a short circuit on the board can completely disable the robot.In this case, it is better to contact the service — 2500-4000₽.

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Before disassembling the robot, take a picture of all the connectors and screws, which will help to avoid errors in the assembly. Use a plastic mediator to carefully detach the clips of the case.

6. Features of models: why Viomi washes differently than Dreame

Robot vacuum cleaners under the brands Xiaomi, Viomi and Dreame have different technical solutions for wet cleaning, which affects typical malfunctions and how to fix them.

For example, in Viomi V3 Often there is a problem when the robot begins the washing cycle, but through 10-15 stops with a mistake for a second. E3. This is due to the overheating of the pump due to the increased load, the solution is to replace the silicone tubes with softer ones (article). VIOMI-007).

In Dreame models with Deep Wash function (for example, DreameBot) Z10 Pro can trigger leak protection if the robot detects excess humidity under the body, in which case recalibration of the sensors through the engineering menu (team #*53681) will help#).

7. When to contact the service: prices and warranty

If you’ve exhausted all the ways to repair yourself, it’s time to turn to the professionals. Here are the approximate prices for repairing wash systems in Xiaomi robots (2026):

• 🔧 Pump replacement (pump) — 1500-2500₽ (model-wise).
• 💧 Cleaning of water supply system (tubes, valves) — 1000-1500₽.
• 📱 Flip-flip-feeing — 800-1200₽.
• 🔄 Replacement of the washing module — 2000-3500₽.
• 🛠️ Diagnostics + maintenance — 2500-5000₽.

⚠️ Note: If your Xiaomi robot is warranty (usually 12 months from the date of purchase), do not disassemble it yourself - this will void warranty obligations:

• 📍 Moscow: Leo Tolstoy St., 5 (SC "Mi-service").
• 📍 St. Petersburg: Obukhov Defense Avenue, 84.
• 📍 Regions: Addresses can be specified on the website mi.com/ru/service.

Before the service visit:

1. Make a backup of the cleaning card in the app (if possible).
2. Write down the serial number of the robot (located on the bottom).
3. Prepare a check or a warranty card.

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If the Xiaomi robot is under warranty but there is no official SC in your city, you can send it to the service center by mail. Xiaomi pays both way transportation costs with warranty repairs.

FAQ: Frequent questions about wet cleaning in Xiaomi robots