Where to pour water into the robot vacuum cleaner Xiaomi: step-by-step instructions for all models

Why a robot vacuum cleaner needs water and where to look for it

Xiaomi’s wet-cleaning robot vacuum cleaners have been a breakthrough for those who value cleanliness effortlessly. But even experienced users are sometimes lost when it comes to water refilling: where to pour the liquid, how much to use and how not to spoil the device? This article will take a look at all the nuances for popular models, from the budget Mi Robot Vacuum Mop to the flagship Xiaomi Robot Vacuum S12.

The main problem is that unlike traditional vacuum cleaners, where everything is intuitive, robots often have a water tank hidden under removable covers or integrated into a rolling system, and fueling errors can lead to leaks, breakages of the pump or even short circuits. Next, we will look at the exact locations of the tanks, the types of fluids allowed, and the typical mistakes that owners make.

If you’ve just unpacked a new assistant or decided to finally master all the functions of the old one, this guide will help you avoid annoying miscalculations. Let’s start with a review of the models – not all Xiaomi robots “drink” water equally!

What Xiaomi models support wet cleaning

Not all Xiaomi robot vacuum cleaners can wash floors, but wet cleaning is relatively recent and not available in all lineups, and here are the key models that include a water tank:

• 🔹 Mi Robot Vacuum Mop (first generation with moping support)
• 🔹 Mi Robot Vacuum Mop 2 (improved version with electronic water control)
• 🔹 Xiaomi Robot Vacuum S10/S10+ (flagships with automatic humidity control)
• 🔹 Xiaomi Robot Vacuum S12 (the latest model with Cross-Laser Navigation)
• 🔹 Viomi V3 (a Xiaomi brand unit specializing in cleaning)

Note that even within a single lineup, there may be modifications without the moping function. For example, the Mi Robot Vacuum (without the Mop prefix) is designed only for dry cleaning. To accurately determine the capabilities of your device, check:

• 📦 Box — This box usually says "Wet & Dry Cleaning" or "Mopping Function."
• 📱 Mobile App – the Mode option should be in the settings.
• 🔍 Design: A removable tank with the inscription WATER TANK or a drop pictogram.

Where is the water tank: analysis by models

The location of the tank depends on the generation and design of the robot. Below are the exact instructions for popular devices. If your model is not on the list, focus on the general principles (see the next section).

Mi Robot Vacuum Mop / Mop 2

These models have a water tank built into a removable garbage container.

1. Remove the top cover (it is fixed with a latch on the front).
2. Remove the dust container - underneath it will be a second compartment with a blue or transparent cover.
3. On the cover of the water compartment is usually marked with a drop pictogram or the inscription WATER.

Xiaomi Robot Vacuum S10 / S10+

Here, the system is more complex: water is poured into a separate tank, which is attached to the back of the robot.

• 💧 Removable tank, with an electronic valve (do not pour water through the top cover!).
• 🔌 There's a socket on the tank to connect to the robot, and it should match the nests on the body.
• 📏 Maximum volume is 200 ml (exceeding will cause error E5).

Xiaomi Robot Vacuum S12

The newest model has a double tank:

• 🔋 The main water tank is in the back, under the removable panel.
• 🧹 Additional container for detergent (optional).

Important: before refueling, make sure that the robot is turned off - the system automatically blocks the water supply when the power is turned on.

Step-by-step: how to properly pour water

Even if you know where the tank is, you can make mistakes.

1. Turn off the robot from the socket (or turn off the power in the application).
2. Remove the tank according to the instructions for your model (see section above).
3. Check the cleanliness of the tank - there should be no dust, hair or residues of detergent inside.
4. Use only distilled or boiled water (see the section "What water to pour").
5. Pour water to the MAX mark (usually 150-200 ml).
6. Install the tank back, making sure all latches have worked (the click should be heard).
7. Check the tightness - shake the robot slightly: if the water is not spilled, everything is fine.

After refueling, it is recommended to start a test cycle of cleaning in a small area (for example, in the bathroom), which will help to make sure that the water is supplied evenly and there are no leaks.

⚠️ Warning: If the robot produces an error E5 or E6 after refueling, it means a water overflow or a pump malfunction. Immediately drain the water and restart the device.

What water can be poured: myths and reality

Xiaomi officially recommends distilled water, but in practice, users often experiment with other options, and let's figure out what's really safe and what's going to harm the robot.

There's a lot of people who put floor washing liquid in the water, but it can be very dangerous.

• 🧪 The foam can clog the water supply tubes.
• 🔋 Aggressive components are corrode by seals.
• ⚠️ The warranty is waived when using uncertified funds.

If you want to disinfect floors, use special capsules from Xiaomi (for example, Mi Mop & Sweep Consumables) or diluted vinegar (1 tbsp. spoon per 1 liter of water).

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To prolong the life of the pump, after each cleaning, drain the remaining water and dry the tank for 1-2 hours with the lid open.

Common Mistakes and How to Avoid Them

Even experienced Xiaomi robot vacuum cleaner owners sometimes make mistakes that lead to breakdowns, and here are the most common mistakes and their consequences:

• 🚫 Overflows lead to error E5 and leaks. Always look at the tag MAX.
• 🚫 Hot water use – deforms plastic parts of the tank.
• 🚫 Closing the tank without clicking - water will spill during cleaning.
• 🚫 Storing a robot with water inside leads to mold and corrosion.
• 🚫 Ignoring Errors – If the robot signals a problem (by sound or in the app), stop cleaning immediately.

One of the most insidious mistakes is to misplace a napkin for moping, and if the tissue is uneven or too tightly attached to the tank, the water will not evenly spread across the floor.

• 🧼 The napkin must be special (microfiber, no pile).
• 📏 The edges of the fabric shall not extend beyond the plastic base.
• 🔄 After 3-5 cleaning, the napkin must be washed (manually, without bleach).

⚠️ Warning: If there are scuffs or puddles on the floor after cleaning, it is a sign that the pump is supplying too much water. In S10/S12 models, adjust the intensity of the moping in the Mop Intensity settings.

What to do if the water is not supplied

So, the situation where the robot drives but doesn't wash the floor is common, and the reasons can be mechanical or software.

1.Tank and tube inspection

First, look at this:

• 🔌 Connecting the tank - if the contacts are oxidized, the robot will not recognize the reservoir.
• 💦 Feeding tubes -- they can get clogged with dust or lime plaque.
• 🔋 Pump -- listen, if you don't hear a slight buzzing when you turn on the moping, the pump doesn't work.

2. Diagnosis through the annex

At Mi Home, check:

• 📱 Cleaning mode – possibly only Sweeping (dry cleaning) is selected.
• 🔧 Moping settings – in some firmwares, the option is disabled by default.
• 📟 Errors — codes E3, E4 or E5 indicate water problems.

3. Mechanical cleaning

If there is water but not supplied:

1. Remove the tank and wash it under warm water (no detergents!).
2. Clean the feed tubes with a thin wire or toothpick.
3. Check the supply valve (the small rubber part at the bottom of the tank) - it could have clogged.

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In 80% of cases, the problem is solved by simply cleaning the tank and tubes. If the pump does not work after all the manipulations, you need to replace the part (contact the service center).

FAQ: Answers to Frequent Questions