1. Red light: indicates that the device has a malfunction or abnormal situation, and needs to be stopped and maintained immediately.
2, yellow light: indicates that the device is about to fail, abnormal conditions, need to be checked and maintained.
3, green light: indicates that the equipment is working normally, there is no fault or abnormal situation.
4, blue light: indicates that the device is in the working state, but is not a fault or abnormal situation.