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What do the green and red LED underneath a Source Controller indicate?

The green status LED indicates the status of the processor PCB. It should be flashing once every second under normal operation. If it is not illuminated then either the Source Controller is not currently powered, or the processor PCB has a fault.

If the green status LED is permanently illuminated then the processor is not running correctly. Resetting the power to the Source Controller may fix this.

The red status LED indicates communication status. It will flash quickly whenever there is activity on the CAN network. If the red status LED is permanently illuminated then this indicates a communication error and steps will need to be taken to test the CAN network and the Source Controller for faults.