How to solve if Mi Air Purifier appear abnormal sound?

Explanation:
1. The purifier is noisy:
The principle of air purifier from the bottom of the hole can pass filter filtered air pollution, the pure air blow out from the top, reciprocating cycle, so clean indoor air purification, can be in the process of extraction and air supply, internal motor and fan in high-speed operation, it will produce certain noise (wind and purifier wall and top of the grille friction voice), the sound is normal, if open the automatic mode or favorite mode, noise will be relatively higher.
Recommendations can be made according to habits and scenarios:
For example:, ① when sleep, such as sensitive to noise, adjust the position of the purifier, open sleep mode.
For example, ② control the purifier remotely. When arriving home, turn on the purifier's favorite mode in advance, purify the air quickly, and adjust to the automatic mode after returning home.
 
2. It has abnormal sound:
If there is abnormal noise in the air purifier, it is necessary to check whether sundry items (such as paper scraps, cards, stones and other small objects) fall into the purifier. If such sundry items fall into the purifier, there may be a harsh abnormal noise when the purifier is running.
The inspection can be carried out according to the following methods:
① Open the door of the filter element bin, take out the filter element, check whether there are sundries in the filter element and the filter element bin, and clean it up.
② Shine a flashlight inside the purifier fan to check whether there are sundries (such as whether there are sundries stuck on the fan blade). Invert the purifier and pour out the articles.