How to Fix / Troubleshooting

Safety first: Remove the battery before further inspection. Do not continue running a noisy motor; it can fail catastrophically.

Isolate source: Run the vacuum briefly without the floor head and wand (just the main body) to confirm the noise comes from the motor, not the brush head.
Check for foreign objects: Inspect the air inlet to the motor for any debris that may be contacting the fan. Do not insert tools into the motor.
If noise persists from motor: The internal bearings or fan are likely damaged. The safe and effective repair is to replace the entire motor assembly.
Avoid DIY motor disassembly: Opening the motor can unbalance the fan and create safety hazards. Use an original Xiaomi motor module.

Vacuum makes loud high-pitched whine or grinding noise during operation

Possible Causes