LED signaling Power LED The power LED indicates the current status. Normal operation In normal operation, the green power LED flashes briefly once per second. Case of an error If an error has occurred, the LED 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. Tip: You can switch off the power LEDs with 3250h:09h.