2 There are several reasons why the health code changed from green to black:
1. The black code of health code may be the health code applied by the user and is under review.
2. When the user's local network is poor, it may also lead to the failure to refresh the health code and the appearance of black code.
3. The black code of health code may also be caused by unsuccessful user authentication or failed verification.
3 How to activate the health code when it turns black needs to be analyzed according to the specific situation, mainly including the following points:
1. If the health code is black because the health code is under review, a green code, a yellow code or a red team will be displayed after the health code is reviewed.
2. If the health code turns black due to bad network, it is recommended to click the refresh button and try several times until it returns to normal.
3. The health code turns black, which may also be caused by the failure of user authentication. At this time, it needs to be re-verified. If the health code shows black for a long time, you can contact customer service to explain the situation and solve it.
Can the health code turn black? Generally speaking, it is unlikely. Only the green code can pass freely during the epidemic.
Health code is an epidemic prevention and control system, which is updated in real time according to the comprehensive situation of citizens. Its color represents the risk level of individual exposure during the epidemic, and the green code represents safety and normal travel. The yellow code indicates that users may have been exposed to the polluted environment in COVID-19 in the past 14 days, and their travel will be restricted; Red team said that the user had close contact with COVID-19 patients within 14 days, and needed to be observed in isolation.
Therefore, we can know that only the green code of the health code is normal travel and will not be affected, while the code black of the health code cannot judge that the holder is not at risk of contracting COVID-19 because it does not indicate the risk status, so it is temporarily impassable, and even if it can, travel will be restricted.