How to replace liquid soap in the Xiaomi dispenser: step-by-step instructions

Owners of Xiaomi’s Smart Home ecosystem often face the need to replenish supplies in a timely manner, and a smart soap dispenser is no exception. Proper and timely fluid replacement ensures not only the hygienic process, but also the durability of the device itself, preventing the pump mechanism from drying out. In this article, we will discuss the replacement process in detail, from choosing the right tool to the subtleties of adjusting the sensitivity of the sensor.

Many users mistakenly believe that you can pour any liquid soap, but the viscosity of the solution plays a critical role in the work of the peristaltic pump. If you ignore the manufacturer's recommendations and use too thick or, conversely, excessively liquid means, this can lead to motor failure or leaks. Below we will consider an algorithm of actions that will avoid common errors and prolong the life of your gadget.

It is worth noting that the design of the Xiaomi Mijia and Yijian dispensers involves the use of interchangeable cartridges, but there are also models with the ability to manually refill. Understanding the differences between these types of devices will help you choose the best service option. We will also touch on the topic of making soap solution yourself, which allows you to save a lot of money without losing the quality of the foam.

Preparation for replacement and selection of consumables

Before you start the immediate replacement, you need to prepare the workplace and make sure that the right tool is available. The best choice is to use the original Xiaomi cartridges, which already contain a balanced composition. However, the market offers many alternatives, and here it is important to pay attention to the consistency: it should be medium, not containing large abrasive particles or sequins.

If you plan to use third-party soap, it often needs to be diluted with distilled water. The proportions are usually 1 part soap per 3-4 parts water, but the exact recipe depends on the original density of the product. The concentration of the solution directly affects the foaming and engine load of the device.

• 🧴 Original replaceable cartridge or high-quality liquid soap of neutral viscosity.
• 💧 Distilled or filtered water for dilution (to avoid scale).
• 🧻 Dry wipes or paper towel for wiping contacts and neck.
• 🔋 New batteries (if the charge level is low), preferably alkaline.

⚠️ Note: It is strictly forbidden to use soap with hard spots, scrubbing particles or excessively thick gels, as they can irreversibly block the silicone pump tube.

It is also important to check the condition of the battery compartment before replacing, so oxidized contacts can cause the device to stop feeding foam even with a full tank, make sure that the springs are clean and the batteries themselves have enough charge to pump a new portion of the liquid.

Replacement of cartridge in models with automatic feeding

The replacement process in models like the Xiaomi Mijia Automatic Induction Soap Dispenser is made as simple as possible by the modular design. You don't have to unscrew complex screws or disassemble the body -- just turn the top counterclockwise, and this action will disconnect the pump unit from the liquid tank.

Once the pump module is dismantled, the old container should be disposed of and a new cartridge installed in its place. When installing, it is important to combine the guides and turn to a characteristic click, which indicates a sealed connection. The silicone tube should be straightened and lowered to the bottom of the new container to avoid air capture.

Some users are faced with a situation where after replacement the device does not start working immediately, in which case it may require several activations of the sensor to pump air from the system. If the foam does not appear after 5-7 attempts, check whether the tube is bent inside the neck.

Manual tank refueling: proportions and technology

For owners of refillable models, such as some Yijian versions or customized Mijia, the refueling process requires more care. The main task is to achieve the correct consistency that will be comparable to the factory sample. Too thick pump solution will not be able to penetrate, and too liquid will simply flow out in drops.

It's recommended to put water in the tank first, then add soap, stirring the solution all the time, avoiding the formation of lumps and ensuring that the components are evenly distributed. Water temperature also matters: it's better to use a liquid at room temperature, because hot water can deform the plastic tank, and cold water can mix worse with the soap base.

Once the tank is filled with liquid, you need to carefully insert the pump tube, trying not to create air bubbles, then the pump unit is inserted into the neck and fixed, and it is important not to transfuse the liquid above the MAX mark, if any, or up to the shoulders of the bottle, so that when the lid is twisted, the excess does not squeeze out.

Sensitivity setting and calibration after replacement

After installing a new cartridge or refilling the tank, the distance sensor may need to be calibrated to ensure that the device responds correctly to the hand raised and does not act falsely when passing by.

In the Mijia app, you can not only adjust the foam level, but also check the battery balance, which is especially important after servicing the device. If you use third-party soap, it makes sense to set a minimum feed time to avoid wasting liquid, since homemade solutions can be less concentrated.

• 📱 Open the Mijia app and select your dispenser.
• ⚙️ Go to the device settings and find the item "Sensitivity" or "Sport volume".
• 🖐️ Test activation by holding your hand at a distance 3-5 centimeter.
• 🔧 If necessary, adjust the slider of the duration of the engine.

There's also a mechanical way of adjusting some models, where the mode switch is on the case, and by switching it, you change the mode of operation: for soap, for disinfectant or for baby foam. Disinfection mode usually involves a shorter but more intense supply, which is worth considering when refilling with alcohol solution.

⚠️ Note: When using alcohol-containing solutions (antiseptics), make sure that the pump seal material is compatible with aggressive liquids, otherwise the rubber elements may dry and leak.

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To test the quality of the foam, make 2-3 blank runs into the sink before first use, which will remove air from the tube and show how well the new mixture works.

Clearance and maintenance of the machinery

During operation, blockages can form inside the silicone tube or at the exit of the nozzle due to drying of soap residues, manifested as a weak head or complete absence of foam when the engine is running, and to clean the pump unit, you need to remove the pump unit and wash the tube with warm water.

If the clog is in the nozzle itself, you can use a thin needle or toothbrush to clean the exterior carefully. Internal ducts are best cleaned by repeatedly pumping clean water through the system. Regular maintenance every 3-4 months will prevent major breakdowns and preserve the aesthetic appearance of the device.

Deep cleaning procedure:


1. Remove the pump unit from the container.




2. Put the tube in a glass of warm water.




3. Activate the dispenser 10-15 times to pump water.




4. wipe the external elements with a dry wipe.




5. Let dry before assembly.

Special attention should be paid to the contacts at the bottom of the device if the model supports charging or has metal connections. Oxidation at this point can cause the device to stop seeing the cartridge or not reacting to commands.

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Timely washing of the system with warm water is the best way to prevent drying of soap inside the tubes and extend the life of the motor.

Frequent problems and methods of their solution

Even with the correct fluid replacement, users may face a number of typical problems, such as the device may hum but not foam. This often indicates that the pump tube is not immersed in the liquid or air has entered the system, in which case you need to check the fluid level and the density of the lid twisting.

Another common problem is spontaneous sensor activation, which can be caused by contamination of the IR sensor or direct sunlight on the receiver, wipe the front panel with soft cloth and make sure that the dispenser does not fall bright light. If the problem persists, it may be necessary to replace the power cells, because when the charge is low, the electronics may not work properly.

• 🔋 Weak pressure: replace batteries with new ones, check the viscosity of the solution.
• 🚫 Not included: check the polarity of batteries and the purity of contacts.
• 💧 Leakage: Check the integrity of the sealing ring and the force of the lid curling.
• 🌫️ False positives: wipe the sensor, remove heat and light sources.

If neither method works, the pump itself or the electronic module may have failed, in which case, if the device is warranted, it is advisable to contact the service center, but in most cases, the problems are solved by adjusting the proportions of the soap and replacing the batteries.