| LED correct operating condition | Fault indication | Possible cause and corrective action |
|---|---|---|
| Power-On (green) | Off | System power is not supplied to the unit. Check the power supply connections and bulk power supply connections. |
| Internal fault. Contact technical support. | ||
| Error-Off (red) | On (continuous) | Unit failed a self-test. Contact technical support. |
| On (flashing) | CPU is not scanning the card. Check the CPU operation. | |
| Hardware error. Replace with a good card of the same type and contact technical support. |