If cardholders are not prompted with early warning information such as "abnormal health code" and "blacklist", then they can take the bus directly without showing their Yuekang code. If the cardholder's health code is abnormal (red code or yellow code), when swiping the card, the vehicle-mounted equipment will voice prompt "abnormal health code" or "blacklist card", and the screen will display "abnormal health code, no boarding". In this case, the passenger should show the Yuekang code with his mobile phone.
The above information is for reference only. If in doubt, please consult the bus company.