Why Xiaomi robot vacuum cleaner makes a lot of noise: reasons and solutions

Xiaomi's robot vacuum cleaner has become an indispensable cleaning assistant, but suddenly there is a hum, grinding or increased noise can ruin the entire impression. If your vacuum cleaner starts to make noise more than usual, it does not always mean a breakage - often the problem is solved by simple cleaning or adjustment. However, you can not ignore changes in the work of the technique: increased load on the engine reduces the life of the device, and extraneous sounds can signal serious malfunctions.

In this article, we will discuss 7 The main causes of noise in the robot vacuum cleaners Xiaomi Mi Robot, Viomi, Dreame and other models of the ecosystem, including the popular series S5/S6, 1C/1T, LDS-You'll learn how to diagnose the problem yourself, which nodes require special attention, and when to contact the service center. 2020–2022 the years of release which are manifested after 1,5–2 service.

1. Filtering and dust collector clogging is the most common cause of noise

According to statistics from service centers, 80% of noise complaints are related to clogging of the filtration system. Xiaomi vacuum cleaners are equipped with multi-stage air purification, and if at least one element is clogged, the engine begins to work to wear.

How it manifests itself:

• 🔊 The hum at high revs – the sound becomes similar to a jet plane when turbo mode is turned on.
• 🌀 Whistling or hissing - indicates air sucking through clogged HEPA-filter.
• 🚫 Reduced suction force – vacuum cleaner collects garbage worse, although the drums rotate.

What to do:

1. Remove the dust collector and clean it of dust. Xiaomi Mi Robot Vacuum-Mop 2 models have two pieces of container, check both.
2. Wash it. HEPA-filter under running water (if it is washable) or replace it with a new one. Xiaomi filters are designed for 3-6 months of operation.
3. Clean the pre-filter (the mesh in front of the main filter) – it is often forgotten to check.

Wash the dust collector with warm water |Dry the filters 24 hours before installation |Test sealing gums for leakiness |Clean the inlet for air-->

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Use a vacuum cleaner to clean filters, which will extend their life by 30%. HEPA-filter.

2. Problems with side brushes and main drum

Side brushes and center rollers (in hybrid models) are the main “consumers” that wear out the fastest, and their failure leads to grinding, knocking or vibrational hum.

Signs of malfunction:

• 🔧 Grinding during rotation - large debris (hair, thread, paper) got).
• 🌀 Uneven noise - bearings of brushes worn out.
• 🛑 Vacuum stops - sensor lock due to jammed brush.

Instructions for elimination:

1. Remove the side brushes and clean them of the coiled hair. In the Dreame D9 models, the brushes are attached to the latches - gently tuck them in with a screwdriver.
2. Check the main drum: remove the debris from the bearing units. In Xiaomi S7 models, the drum is removed after the 4 screws are removed.
3. Lubricate the bearings with silicone lubrication (do not use WD-40!).

If you've cleaned your brushes, check the drive gear, and Viomi V3 models have a problem with plastic gears that wear off after 1 to 1.5 years.

Fan and turbine malfunctions

A fan is the heart of a vacuum cleaner, and when it breaks, it causes a big buzz, vibration, or a complete stop. Xiaomi models use brushless engines, but even they are not immune to wear.

Typical symptoms:

• 🔊 Roaring sound - fan blades touch the body due to imbalance.
• 🌀 Pulsating noise – engine bearings worn out.
• 🚨 Automatic shutdown – protection against overheating is triggered.

Diagnosis and repair:

1. Remove the top cover of the vacuum cleaner (unscrew 4 screws under rubber plugs).
2. Get the fan unit. Xiaomi Mi Robot Vacuum E10 models have it mounted on 3 latches.
3. Check the back shaft of the fan, if you have one, you need to replace the bearings or the entire unit.

Once a month | Once every 3 months |Only when it starts to make noise |Never cleaned-->

⚠️ Attention! If you find that the fan blades are scratched or deformed during the disassembly, do not try to straighten them, this will lead to imbalance and accelerated wear of the engine.

4. Problems with wheels and suspension

The noise when the vacuum cleaner is moving is not always associated with the suction system, and the screeching, knocking or hum when driving indicate problems with the chassis:

Frequent causes:

• 🚗 Wear rubber wheels - the tread is erased, a screech on the laminate appears.
• 🔧 The fall of debris in the bearings of wheels - leads to uneven rotation.
• 🛠️ Weakening of suspension fasteners - knocking when overcoming thresholds.

How to eliminate:

1. Remove the wheels (they are mounted on an axle with a latch or screw). Clean the axle of dirt and lubricate.
2. Check the suspension shock absorbers. The Xiaomi S6 models have them under the front bumper.
3. If the wheels are worn unevenly, replace them with a pair – even one new wheel can cause imbalance.

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Regularly check the condition of the wheels: worn rubber not only makes noise, but also reduces the passability of the vacuum cleaner on carpets.

5. Factory defects or structural defects

Some Xiaomi robot vacuum cleaners have hidden manufacturing defects that show up over time.

Known problems in models:

• 🔧 Xiaomi Mi Robot Vacuum 1 (2016–2018) – weak fan bearings, start to make noise after 1.5 years.
• 🌀 Viomi V3 — defect of plastic gears in the brush reducer.
• 🚨 Dreame D9 (First batches: improper balancing of the turbine.

How to check:

1. Check your model’s serial number against the review database on the forums (e.g. 4UDA or MIJIA).
2. If the vacuum cleaner is warranty, contact the service with the part item item (for example, ZNMS12FM for the Mi Robot S5 fan).

⚠️ If your Xiaomi vacuum cleaner was released in 2020-2021 and started to make noise after the firmware update, the problem may be changing the fan algorithm.

6. Electronics and firmware problems

Sometimes the noise is not mechanical, but electronics are not working properly.

Signs of software failures:

• 🔊 The fan works at maximum speeds even in quiet mode.
• 🌀 The vacuum cleaner spontaneously turns on the turbocharger.
• 🛠️ Mistake. E5 or E9 on display (problems with the engine).

Decisions:

1. Reset to factory settings: Press the Home + Spot Cleaning buttons for 10 seconds.
2. Update the firmware through Mi Home App (Settings → Software Update).
3. If the error persists, check the contacts of the control board - oxidation can cause false sensor signals.

It's important! Xiaomi models with LDS-With a laser (e.g. Mi Robot Vacuum-Mop P), noise may be caused by the laser module overheating, in which case it will help to reboot or clean the lens of dust.

External factors: carpets, rapids, furniture

Sometimes the noise is not caused by the vacuum cleaner itself, but by the vacuum cleaner.

Common "external" causes of noise:

• 🧵 Long-tail carpets – brushes cling to the pile, creating an additional load.
• 🪜 High rapids - the vacuum cleaner hits them with a bumper, which causes the body to vibrate.
• 🪑 Low furniture – vacuum cleaner touches the legs of chairs or sofas.

How to minimize noise:

1. Use virtual walls in the Mi Home app to limit obstacle areas.
2. Set Quiet Mode for night work.
3. Check the height of the brushes: the Xiaomi S7 models can adjust it for different types of coatings.

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If the vacuum cleaner makes noise only in a certain area, record a video of its work - this will help to more accurately diagnose the problem.

FAQ: Frequent questions about noise in Xiaomi robot vacuum cleaners