Why does the Xiaomi Fan Heater have abnormal sounds and smells?

The reasons for making sounds of the Xiaomi Fan Heater are listed below:
The bang sound is the sound made by the tilt switch inside the heater when it is tilted or fallen over, which is normal.
The bearings of the heater are coated with grease. Due to the low temperature in winter, it takes about 10 minutes for the grease to work properly. When the grease is fully lubricated, the friction of the bearing will decrease and the sounds will become lower with the running time. It is recommended that you turn on the heater and run it for 10 minutes before checking the effect.
The reasons for having abnormal smells are listed below:
The Xiaomi Fan Heater focuses on controlling the source of smells. The body plastic is made of RoHs-compliant high-temperature flame-retardant materials, and the heating components are strictly controlled and treated for abnormal smells. The smells mainly come from unclean air (water vapor, dust, volatile organic matter, microorganisms, etc.) which will produce smells when heated to about 200°C. It will disappear after 2 to 3 minutes of heating.