1. If you just applied for a health code, the health code information in the system is still under review. At this time, the health codes are all black, and no other colors will appear.
2. If the network is special, it is likely that the health code will be different. At this point, you can refresh the health code again.
3. Although the real-name authentication has been carried out, if the real-name authentication fails, it is very likely that the health code is still black, resulting in the inability to display colors.
4. It is possible that there is something wrong with the system of the health code itself, so the health code cannot be displayed normally. At this point, you can uninstall the software and try to download and log in again.
What if the hygiene code turns black?
Health regulations are very important to us. In general, the colors of health codes can be divided into three types, namely, green code, yellow code and red code. If the health code becomes a black code and the above conditions are not met, you can apply for transcoding, or call the customer service hotline to ask about your situation and seek a solution.