The situation when the robot vacuum cleaner Xiaomi continues to drive around the room and suck the dust, but stops wiping the surface with a wet cloth, familiar to many owners of smart equipment. Most often, the problem lies not in the breakdown of electronics, but in the banal locking of water supply or incorrect settings in the Mi Home application. Unlike dry cleaning, the wet cleaning system requires constant monitoring of fluid levels and the condition of consumables.
Before you take the device to the service center, you need to make a thorough diagnosis of mechanical components and software constraints. Often users forget that the cleaning module requires activation of the appropriate mode, and the water level sensors can be contaminated. System failure or clogging of microchannels are the two main enemies of high-quality cleaning, which can be managed independently in 15-20 minutes.
In this article, we will discuss in detail the algorithm for restoring wet cleaning functionality on Xiaomi Vacuum, Roborock and Mijia models. You will learn how to clean the pump, check the integrity of the hoses and adjust the water supply intensity through your smartphone. Follow the instructions consistently to exclude all possible causes of malfunction.
Diagnostics of the wet cleaning module and the tank
The first step should always be to visually inspect a removable water tank, and if the robot vacuum cleaner is not feeding water to the cloth, it may be a misfixed or skewed tank that keeps the contacts closed, and make sure the tank lid is sealed and the rubber seals are not damaged or contaminated.
Carefully inspect the outlet of the tank and the input to the pump of the device. Even a microscopic pile or a particle of scale from hard water can completely block the current of the liquid. Use only distilled or filtered water to fill the tank to prevent mineral deposits from forming inside the microchannels. Wash the tank with warm water without using aggressive chemistry.
Check the condition of the cloth itself. If it is dry or too wet and stuck, the contact with the floor will be disturbed. The cloth must be uniformly wet and fit tightly to the sole of the module. Some Xiaomi models require manually wet the cloth before starting work, since automatic wetting has a delay.
⚠️ Warning: Never add conventional liquid detergents, foaming compounds or bleach to the tank, which causes the pump's rubber seals to collapse and nozzles to clog, rendering the warranty invalid.
Checking settings in the Mi Home app
Often the reason for the lack of water is software constraints. Go to the Mi Home app and select your device. Make sure that the cleaning scenario activates wet cleaning or floor washing. If you select the vacuuming mode only, the pump will not work, regardless of the water in the tank.
Check the water intensity settings. You can often choose the level from the control menu: Low, Medium, High, or Off. If you have a minimum value and the floor is very dry or puffy, it may seem that water is not being supplied at all. Try to increase the parameter to the maximum value for the test.
It's also worth checking if there's a ban on wet cleaning for certain areas, and if you're mapping a room, you can set up "No-Go zones" or virtual walls that the robot perceives as carpets, automatically turning off the water supply when you enter them.
- 📱 Make sure the device card displays the status "Water tank installed».
- 💧 Check the intensity level in the Water Settings or Water Level section».
- 🗺️ View the map of the room for virtual restrictions for the cleaning mode.
- 🔄 Update the Mi Home app to the latest version through the app store.
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If the status of the tank is not determined in the application, try to remove the wet cleaning module, wipe the contacts with a dry wipe and insert it back before the characteristic click.
Mechanical cleaning of pumps and channels
If the software settings are fine, we'll move to the mechanics. Inside the Xiaomi wet cleaning module, there's a miniature pump that delivers water under pressure, and over time, it can form air traffic jams, and you can try to press the forced water supply button several times to fix them (if there is one on the tank case), or run the cleaning cycle through the service menu.
Deep cleaning requires removing the bottom cover of the robot (usually a few screws under rubber legs) and accessing the pump, carefully blowing out the output tubes or washing them with a syringe of warm water, and you need to act extremely carefully so as not to damage thin silicone hoses.
In some cases, the "backwash" method, where water is fed into the system from the opposite side, pushing out the clog, helps. However, this method requires disassembling the device and having skills in working with small electronics, if you are not confident in yourself, it is better to limit yourself to externally washing removable parts.
☑️ Diagnostic pump
Analysis of sensors and electronic boards
Modern models of Roborock and Xiaomi are equipped with water level sensors and detect the presence of a tank. If these sensors are contaminated with dust or oxidized from moisture, the robot will “think” that the tank is empty or absent.
Check the electronic board for traces of corrosion. Water entering the housing is not uncommon when you use too much fluid or use too much fluid. Contact corrosion can interrupt the pump's power chain.
If you notice oxidation, you can try to clean the contacts gently with a stripe or soft brush soaked in isopropyl alcohol, and it is important to let the device dry completely before turning on so as not to short-circuit.
| Symptoms. | Probable cause | Method of decision |
|---|---|---|
| The pump's buzzing, no water. | Air traffic jam or blockage | Canal purging, system pumping |
| Pomp is silent. | No food or burnt. | Contact check, pump replacement |
| Water drips spontaneously | Valve malfunction | Replacement of the electromagnetic valve |
| The "No tank" error | Dirty contacts | Cleaning the contact group with alcohol |
⚠️ Warning: Disassembly of robot vacuum cleaner may lead to loss of warranty.If the device is in warranty service, it is better to contact an authorized service center Xiaomi.
Resetting settings and updating firmware
Sometimes a software glitch blocks the actuators. Try resetting to factory settings. On most Xiaomi models, this is done by simultaneously pressing the Home and Turn on buttons for 5-10 seconds, or through the app menu.
After reset, be sure to check for firmware updates. Developers regularly release patches that fix pump and sensor management errors. Connect the robot to Wi-Fi and find "Check Updates" in the Mi Home app.
During the upgrade, do not turn off the robot or interrupt the Internet connection. Interrupted firmware can lead to the “bricking” of the device, after which it will be extremely difficult to restore it.
Hidden functions of the engineering menu
Replacement of consumables and components
If no cleaning methods have worked, the pump itself or the electromagnetic valve may have failed, and these parts are consumables and wear out over time, and you can buy an original pump or a compatible analogue on marketplaces or in robotics parts stores.
When replacing the pump, pay attention to the power voltage (usually 12V or 24V) and the type of connector. An improperly selected part can burn the main control board, and it is recommended to immediately replace the fine filters that often come with a new pump.
Don't forget to replace the floorwashing cloth itself, which is old, hardened fabric that not only does not wash well, but can also create additional resistance, interfering with the normal functioning of the water distribution system.
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If after replacing the pump and cleaning the channels, water is still not supplied, the problem may lie in the malfunction of the main motherboard of the robot, which requires professional repair.