Xiaomi vacuum cleaner H20 Does not pull the brush: causes of breakage and how to fix

You have noticed that your robot vacuum cleaner Xiaomi Mi Robot Vacuum-Mop 2 Pro (H20) Is the brush not rotating, does not pick up garbage from the carpet or is it jammed? This is a problem that many owners have, but 80 percent of the time, you can solve it yourself without going to the service center. In the article we will analyze all possible causes - from banal clogging to malfunction of the brush engine, and also give step-by-step instructions for diagnosis and repair.

Feature of the model H20 It's a double side brush and a direct-drive main turbo brush, and if the central brush isn't working, it could be due to mechanical obstructions (hair, thread) or electronic failures. We're not going to offer magic solutions like a reboot, but instead focus on specific steps that really help, start with the simplest and end with complex cases that require disassembling the device.

1. Clogging of the brush or duct is the first cause of weak traction

60 percent of the time, the problem is the simple blockage. H20 It has a narrow gap between the rotating shaft and the body, where the hair, threads or fur of pets can easily be wound, and even a small lump can block rotation or put additional stress on the motor, causing the brush to brake or stop completely.

How to check:

🔍 Visual inspection: flip the vacuum cleaner and flashlight into the brush area. If you see wound hair or debris, the problem is found.
🖐️ Hand check: try to turn the brush with your fingers. If it's not rotating or it's moving with force, there's a mechanical lock.
🌀 Duct test: turn the vacuum cleaner on at maximum power and put your hand on the air intake. If the traction is weak even without a brush, the channel is clogged.

What to do:

Disconnect the vacuum cleaner from the network and remove the garbage container.
Remove the turbobrush by pressing the fixtures on the sides (on the model) H20 They're symmetrically arranged).
Clean the shaft of the brushes from the wound hair with a knife or tweezers. Be careful - do not damage the plastic blades!
Wash your brush under warm water (no more than 40).°C) with soap, then dry for at least 24 hours.

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If the brush is worn out (the blades are worn or cracked), it is better to replace it. H20 articulate ZNMS18WM standing around 1500-2000 ruble.

Wear or damage to the brush drive belt

Unlike the newer models, Xiaomi H20 It uses a belt drive to transfer torque from motor to brush, and over time, the belt stretches, cracks, or even tears, which is the second most common reason why the brush doesn't rotate:

🔊 The brush makes creaking or whistling sounds when working.
🌀 The swelling is a slew of sleeves, and it is a slew of sleeves).
🛑 The brush does not respond to the switching command, but the vacuum cleaner motor is working.

How to diagnose:

Remove the bottom cover of the vacuum cleaner by unscrewing 4 screws (use a screwdriver). T5).
Find a belt, it connects the pulley of the motor and the shaft of the brush, and normally it should be pulled without sagging.
Check the belt for cracks, ruptures, or traces of oil (this is a sign of bearing wear).

Decision:

🔧 If the belt is intact, but weakened - adjust the tension by shifting the mounting of the motor (in the instructions to the H20 pattern).
🛒 If the belt is torn, replace it with a new one (article) ZNMS19RB, price ~800 rubles).

What happens if you ignore the wear of the belt?

If you continue to operate with a stretched or torn belt, this will lead to: 1) Overheating of the brush engine (it works idle, but does not turn off). 2) Accelerated wear of the bearings of the shaft. 3) Breakage of the power wires of the motor due to increased vibration. In the worst case, you will need to replace the entire brush module (~3,000 rubles).

3. Brush motor malfunction: how to check and what to do

If the brush is clean, the belt is intact, but there is no rotation - the problem may be the engine. H20 Direct current collector motor is used (DC 12V), It wears out over time. Typical symptoms:

🔥 The motor warms stronger than usual (you can feel your hand after 5 minutes of work).
🔊 There is a buzz or crackle when trying to start the brush.
🛑 The brush does not respond to commands from the Mi Home app.

Engine diagnostics:

Remove the bottom cover and disconnect the power connector of the brush motor (usually a white 2-pin connector).
Connect the motor directly to the source 12V (You can use the power supply from the router. If it doesn't spin, it's faulty.
Check the resistance of the windings with a multimeter: the normal value for H20 — 10-15 Oh, if he does. 0 (short-circuit) or ∞ (cliff) - engine replacement.

Decisions:

🔧 If the motor buzzes, but does not rotate - try to clean the collector (copper contacts) of alcohol soda.
🛒 If the engine is dead, replace it with a new one. ZNMS20MB, price ~2500 rubles).

Cleaning my hairbrush.|Checking the belt.|Testing the engine.|I haven't tried anything yet.|Another option-->

4. Problems with electronic control board

Less commonly, the reason lies in the control board that controls the power of the brush motor. H20 This is the responsibility of a separate controller located next to the main board:

💡 The brush works in jerks, despite the cleanliness and serviceable belt.
🔄 The vacuum cleaner spontaneously turns on / off the brush during cleaning.
⚡ Mi Home App displays Error 12 error (motor malfunction code).

How to check the fee:

Remove the top cover of the vacuum cleaner (a screwdriver will be required). T6).
Find the brush motor control board – it is usually located to the right of the main controller.
Examine it for bloated capacitors, burnt tracks or oxidized contacts.

Possible solutions:

🔧 If the contacts are oxidized, clean them with a swallow or alcohol.
🔥 If the capacitors are swollen - replace them with a soldering iron (you need electronics skills).
🛠️ If the fee is burned, replace it in its entirety (article). ZNMS21PCB, price ~3500 rubles).

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Before you change the board, be sure to check the voltage at the input with a multimeter. If there is no power, the problem may be in the main control unit or battery.

5. Failures of the firmware or Mi Home app

Sometimes the brush doesn't work because of software errors, especially after the firmware update. 3.5.8_0040 for H20 There was a bug that caused the vacuum cleaner to ignore the instructions to turn on the turbobrush:

📱 In the Mi Home app, the brush is displayed as turned off, but physically it is working.
🔄 After restarting the vacuum cleaner, the problem temporarily disappears.
🛑 Other functions (suction, navigation) work normally.

Solutions:

Update the Mi Home app to the latest version|Restart the vacuum cleaner (hold the power button for 10 seconds)|Reset the vacuum cleaner settings to factory (Settings) → Reset)|Refuse the vacuum cleaner through Mi Home → Update of the PO-->

If the reset didn’t help, try manual firmware updates:

Download the latest firmware for Xiaomi H20 from the official website (the file has the extension.pkg).
Place the file in the root folder of the microSD card (insert into the slot on the vacuum cleaner case).
Press the Reset button for 5 seconds – the vacuum cleaner will automatically start the update.

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After updating the firmware, reset the Mi Home app cache in your phone settings, which will eliminate any conflicts between the old and new versions of the software.

Mechanical damage: failure of the shaft or bearings

If all previous steps have failed, the cause may be mechanical failure of the shaft of the brush or bearings, which occurs after a vacuum drop, impact or prolonged use (more than 3 years).

🌀 The brush rotates with a strong vibration or beating.
🔊 You can hear metal squeaking when working.
🛑 The shaft of the brush luftite (wobbles from side to side).

Diagnosis:

Take off your brush and check the shaft for backlash by shaking it with your hand.
Scroll the shaft - if you feel "sand" or jamming, the bearings are worn out.
Examine the body of the brush for cracks (especially in the place of attachment to the vacuum cleaner).

Decisions:

🔧 If the backlash is small - you can temporarily eliminate it by placing a thin washer under the mounting of the shaft.
🛠️ If the bearings are broken, replace the entire brush module (article) ZNMS18WM).
💥 If the body of the brush is cracked - replacement is required (repair is inexpedient).

Can you lubricate the bearings yourself?

Theoretically, yes, but in practice, it's a temporary solution. H20 closed type and lubricant (e.g, WD-40) It will only penetrate the surface. 1-2 The problem will come back in a month, and the lubricant can draw dust, making it worse, so you'd better replace the bearings or the entire module.

7. Battery problems: not enough power for the brush

If the vacuum cleaner H20 It sucks poorly, and the brush is jerking, and it could be a broken or worn battery, and the brush motor requires high current, and when it's low, the vacuum cleaner automatically slows down:

🔋 The vacuum cleaner discharges quickly (less than 30 minutes of work).
🌀 The brush slows down on carpets or when climbing into a hill.
🛑 The Mi Home app displays a Low Battery warning even after a full charge.

Diagnosis of the battery:

Check the actual battery capacity through the Mi Home app (Battery Status section) and normally 100% after full charge (or ~5,200 mAh).
Measure the voltage at the battery terminals with a multimeter: 🔋 16.8V — full-load. 🔋 14.0V-15.0V — partial-rate. 🔋 Below. 12.0V — deep discharge, replacement is required.

Decisions:

Problem.	Reason.	Decision	Cost
Quick discharge.	Natural battery wear (more than 500 charge cycles)	Replacement of the battery (article) ZNMS22BT)	~3,000 rubles
Not holding the charge.	Failure of the battery controller	Replacement of fees BMS or the whole battery	~2500 rubles
No charge.	Oxidation of contacts or faulty charging station	Cleaning contacts / replacing the docking station	~1500 rubles
Battery bloating	Short circuit within the element	Immediate replacement, exploitation is dangerous!	~3500 rubles

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If the battery is swelling, stop using the vacuum cleaner immediately. Lithium-ion batteries in this state can ignite!

Frequently Asked Questions (FAQ)

❓ Why the brush only works at maximum power?

It's a sign of wear or engine failure. At low speeds, the belt slips because of insufficient tension, and the motor can't turn the brush. Check the belt tension and the resistance of the motor windings (should be the first step). 10-15 Om).

❓ Can I use a vacuum cleaner without a brush?

Yes, but the cleaning efficiency will decrease. 40-50%. Without a turbobrush, the vacuum cleaner will only collect light debris (dust, small debris), but it will not cope with hair, hair or large particles.

❓ How much does it cost to repair a brush in a service center?

The cost depends on the problem: 🔧 Cleaning and lubrication — 500-1000 ruble. 🛠️ Replacement of belts — 1500-2000 ruble). 🔥 Replacement of the brush engine — 3000-4000 ruble. 💻 Management board repair — 2500-3500 Average check in Moscow — 2500 In the regions cheaper 20-30%.

❓ How to extend the life of Xiaomi brush H20?

Follow these recommendations: 🧹 Clean your brush after each cleaning (especially if you have pets). 🚫 Do not use a vacuum cleaner to collect construction debris (cement, plaster clog bearings). 🔋 Do not store the vacuum cleaner on charging for more than 24 hours – this reduces the battery life. 🌀 Once every 3 months lubricate the brush shaft with silicone lubricant (1 drop).

❓ Where to buy spare parts for Xiaomi H20?

Official spare parts: 🛒 Mi Store (original, warranty, but expensive). 🛒 AliExpress (cheap, but check the seller – higher rating) 98%). 🛒 Local service centers (sometimes sell used parts with a warranty) Average prices (2026 Year: Brush — 1500-2000 rupee — 600-900 Brush engine — 2000-2800 ruble.

If after all the checks, Xiaomi brush H20 It never worked, perhaps the problem is the firmware of the main controller or damage to the power circuit, in which case it is better to contact the service, since the diagnostics will require specialized equipment (oscillograph, programmer). Remember that self-repairing deprives you of warranty (if it is still valid).

To prevent these problems, we recommend that you do a full monthly diagnosis: clean your brush, check your belt tension, and update your firmware. 2-3 year longer than average.