How to fix Xiaomi’s wet cleaning robot vacuum cleaner: the full guide 2026

Xiaomi's wet-cleaning robots are real home assistants, but even they sometimes break down. If your machine stops cleaning floors, makes mistakes, or refuses to turn on, don't rush it to the service center. Most of the faults can be fixed by yourself, saving time and money.

In this article we will analyze the most common breakdowns of robot vacuum cleaners Xiaomi Mi Robot Vacuum-Mop, Viomi V3, Dreame D9 You will learn how to diagnose the problem, what tools you will need for repairs, and you will receive step-by-step instructions with photos and videos (where possible). Particular attention will be paid to the water supply system, pumps, sensors and electronics - they most often fail.

Before you start repairing, make sure that the problem is not the trivial things: a discharged battery, a clogged filter or the wrong settings in the Mi Home app. If the vacuum cleaner does not respond to the on button, first check the charger and contacts at the docking station. In 60% of cases, the "breakdown" is due to insufficient care: clogged nozzles, dried cloth or contaminated sensors.

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1. Fault Diagnosis: How to Know What's Broken

The first step is to identify symptoms. Xiaomi’s wet-cleaning robots usually “complain” problems in the following ways:

• 🔴 Errors in the annex (codes) E1, E2, E5, E9 others).
• 💧 No water is supplied to the cloth, although the tank is full.
• 🔊 Extraneous sounds (screaming, buzzing, clicking) when the pump is working.
• 🚫 Refusal to clean: vacuum cleaner turns on but does not wash the floor.
• 🔋 Rapid discharge or complete failure of the battery.

The most common causes of breakdowns:

1. Clogging of the water supply system (tubes, filters, nozzles).
2. Wear or breakage of the pump (responsible for the supply of water to the cloth).
3. Failure of sensors (water level, humidity, collision).
4. Problems with electronics (control fees, contacts).
5. Mechanical damage (rags, rollers, bumper).

If the vacuum cleaner gives you an error code, check the value in the official documentation or in the Mi Home app first.

• E1 — collision-sensor.
• E2 — clogging.
• E5 — water-delivery.
• E9 — gyroscope or position sensor error.

⚠️ Warning: If the vacuum cleaner emits a sharp chemical smell or smoke, immediately disconnect it from the network! This is a sign of short circuit or overheating of the electronics.

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Tools and parts for repair

For self-repair of the robot vacuum cleaner Xiaomi you will need:

• 🔧 Screwdrivers: cross (usually) PH0 or PH1) flat-shell.
• 🔍 Tweezers – for extraction of small parts (springs, contacts).
• 🧴 Isopropyl alcohol (90%+) — cleaning contacts and boards.
• 🧽 Cotton swabs and wipes - for cleaning sensors and mechanisms.
• 🔌 Multimeter – to check voltage on boards and circuits.
• 🛠️ Plastic blades - for a careful opening of the body without scratches.

If you need to replace parts, pre-order them on AliExpress, in the official Xiaomi service or from trusted sellers.

⚠️ Warning: When buying parts, check their compatibility with your model! V3 It's not going to work for the Mi Robot Vacuum-Mop 2, even if they look similar.

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Before disassembling the vacuum cleaner, take a picture of the location of all the wires and connectors, which will help to properly assemble it back and avoid connection errors.

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3. Cleaning of the water supply system: step-by-step instructions

If Xiaomi's robot vacuum cleaner doesn't wash the floor, but the water in the tank is there, it's probably a clogged feed system, which is the most common problem, and it can be fixed without replacing the parts.

What to clean:

• 💦 Water tank (especially liquid intake hole).
• 🔄 Pipes and hoses (can be clogged with scale or dust).
• 🚿 Nozzles (small holes through which water enters the cloth).
• 🔧 The pump (if it does not pump water, but does not burn).

Detailed instructions:

1. Turn off the vacuum cleaner and remove the water tank. Pour the liquid and rinse it with warm water. If there is a plaque, use a vinegar solution (1:1 with water) or special means to remove scale.
2. Remove the cloth and mount, check if the water supply holes are clogged (they can be cleaned with a toothpick or needle).
3. Unplug the tubes from the pump (carefully so as not to damage the mounts!) Blow them with a compressor or a bicycle pump. If the clog is severe, rinse the tubes with citric acid water.
4. Check the pump, plug it in to power (if you can work with electronics), or just see if it works when you turn on the cleaning. If the pump is buzzing but not pumping water, it needs to be disassembled and cleaned.

If the water is not supplied after cleaning, the problem may be:

• Water level sensor (incorrectly determines the amount of liquid).
• Electronics (no signal is sent to the pump).
• Fragmentation in the valve (sometimes it needs to be replaced).

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4. Replacement of the water supply pump

If the cleaning didn't work, and the pump doesn't pump water or hum, but it doesn't work, it needs to be replaced, which is one of the most difficult operations, but you can do it without experience.

Signs of a faulty pump:

• 🔇 The vacuum cleaner turns on, but no water is supplied to the cloth.
• 🔊 The pump hums but does not pump (sound is heard but the liquid does not move).
• 💥 There's a mistake. E5 or E10 appendix.

How to replace the pump:

1. Disconnect the vacuum cleaner from the network and remove the water tank.
2. Turn the vacuum cleaner over and unscrew the screws on the bottom cover (usually 4-6 pieces).
3. Carefully remove the lid so as not to damage the wires. The pump is usually located next to the water tank.
4. Disconnect the power connectors and the tubes from the pump. Remember (or take a picture) how they're connected!
5. Unscrew the screws that attach the pump to the body, and remove it.
6. Install a new pump, connect the tubes and wires in reverse order.
7. Get the vacuum cleaner and check the work.

⚠️ Warning: When replacing the pump, don't use force! Plastic mounts and tubes are easy to break. If the connector doesn't detach, try gently wiggling it from side to side, don't pull it sharply.

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After the pump is replaced, make sure to check the tightness of the system! Pour the water into the tank and run a test cleaning in a small area. If there are leaks, check the density of the tubes.

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5. Repair of sensors and electronics

If Xiaomi's robot vacuum cleaner makes mistakes, doesn't see obstacles, or refuses to wash the floor, the problem could be sensors or a control board.

• 📏 Water level sensor – responsible for monitoring the fluid in the tank.
• 👁️ Infrared sensors – identify obstacles and edges.
• 🧭 Gyroscope – responsible for navigation (error) E9).
• 🔋 Charge sensor – if the vacuum cleaner does not return to the base.

How to check and repair sensors:

1. Contact cleaning: Turn off the vacuum cleaner, remove the lid, and wipe the sensor contacts with isopropyl alcohol. Often, oxidation or dust interfere with normal operation.
2. Wiring Check: Make sure that the wires going to the sensors are not damaged and sit tightly in the connectors.
3. Replacement of sensor: If the sensor is broken (for example, does not respond to water or obstacles), it should be replaced.

Repair of the management board:

If the vacuum cleaner doesn't turn on or behaves unpredictably (it turns off on its own, doesn't respond to commands), the problem may be the main board.

• Check the board for blackened elements (burnt resistors, capacitors).
• Test the voltage with a multimeter at key points (if there is a circuit).
• If the board is burned, it's easier to replace than to repair it. The price of a new one is 2,000 to 5,000. ₽ model-wise.

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If the vacuum cleaner is not working properly after a fall or impact, check the board for microcracks, sometimes they are only visible under a magnifying glass, such defects can be eliminated with a soldering iron, but it is better to trust it to a professional.

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Battery problems: replacement and recovery

If Xiaomi's robot vacuum cleaner discharges quickly, doesn't hold a charge or doesn't turn on at all, the battery is a problem. The average battery life is 2-3 years, after which its capacity drops markedly.

Signs of a "dying" battery:

• 🔋 Charging longer than 6 hours.
• 🕒 Works less than 30 minutes after full charge.
• ⚡ Turns off at 20-30 charge level%.
• 🔌 Not returning to the docking station (lack of power).

How to replace the battery:

1. Buy a new battery of the same capacity and model (for example, for Mi Robot Vacuum-Mop 2 will suit the battery for 3200 mAh).
2. Turn off the vacuum cleaner and flip it over. Unscrew the screws on the bottom cover.
3. Carefully disconnect the battery connector from the board. It's usually fixed by a latch -- don't pull the wires!
4. Remove the old battery and install a new one by plugging in the connector.
5. Collect the vacuum cleaner and charge the battery to 100% before first use.

Can an old battery be restored?

If the battery is bloated or degraded, it's better to replace it, but if the only problem is the loss of capacity, you can try to resuscitate it.

• Completely discharge the battery (before the vacuum cleaner is turned off).
• Charge it 100% and leave it on charging for another 2-3 hours.
• Repeat the discharge-charging cycle 2-3 times, which can return up to 20% of the lost capacity.

⚠️ Warning: If the battery is swelling or deformed, don't try to repair it! It's dangerous - the battery may ignite. Replace it with a new one immediately.

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7 Mechanical breakdowns: rollers, brushes, rags

If Xiaomi's robot vacuum cleaner is not cleaning the floor well, leaves divorces or does not move, the problem may be in the mechanical parts.

• 🧹 Side brushes – over time, their pile wears off, and they stop sweeping garbage to the main brush.
• 🌀 The main roller - it wounds hair and threads, which blocks the rotation.
• 🧺 Cloth and fastening – if the cloth is torn or fits poorly, the water is not evenly distributed.
• 🚗 Wheels and bearings – over time they get clogged with dust and stop spinning.

How to fix the mechanics:

1. Clean brushes: Remove the main roller and side brushes. Remove the wound hair, thread and debris. Wash them with warm water and dry them.
2. Replace the cloth: If the cloth has broken or lost its shape, replace it with a new one. Make sure the mount fits tightly to the floor.
3. Wheel lubrication: If the vacuum cleaner doesn’t drive well or creak, lubricate the wheel axles with silicone lubrication (don’t use oil!).
4. Bumper check: If the vacuum cleaner doesn't respond to obstacles, check the springs and micro-switches under the bumper. They may have clogged or broken.

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To keep brushes lasting longer, clean them after each cleaning, use scissors or a special hair removal tool (sold in pet stores).

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8. Prevention of breakdowns: how to prolong the life of a vacuum cleaner

To make the Xiaomi robot vacuum cleaner last longer and not break down, follow the simple rules of care:

• 💧 Change the water after each cleaning. Stagnant fluid causes scaling and blockages.
• 🧹 Brush once a week. Wrapped hair and threads increase engine load.
• 🔋 If the vacuum cleaner is idle for a long time, its battery discharges to zero, which reduces the life of the vacuum cleaner.
• 🧽 Rinse the tank 1-2 times a month with vinegar or citric acid (from scale).
• 🛠️ Update the firmware. The manufacturer regularly releases patches that fix navigation and cleaning errors.

What can't be done:

• 🚫 Using hot water - this spoils seals and pump.
• 🚫 Add detergents (except special ones for robot vacuum cleaners).
• 🚫 Leaving the vacuum cleaner in the sun or near the battery is damaging to the battery.
• 🚫 Drop or hit a vacuum cleaner - a blow can damage a gyroscope or board.

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Regular care of a robot vacuum cleaner reduces the risk of breakdown by 70%, and most faults are caused by blockages that can be prevented by simple cleaning.

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FAQ: Frequent questions about repairing Xiaomi robot vacuum cleaners