LED signaling Power LED Normal operation In normal operation, the green power LED L1 flashes briefly once per second. Case of an error If an error has occurred, the LED turns red and signals an error number. In the following figure, the error number 3 is signaled. The following table shows the meaning of the error numbers. Flash rate Error 1 General 2 Voltage 3 Temperature 4 Overcurrent 5 Controller 6 Watchdog-Reset Note: For each error that occurs, a more precise error code is stored in object 1003h.