Basic diagnostic information is displayed on the four LED navigation lights of the ELIOS 2. A combination of blinking patterns and colors are used to transmit different types of information about the status of the drone.
Drone Idle:
| Ready to fly |   |
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Ready to fly (low battery) |
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| No radio link |  |
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Hardware error (check Cockpit) |
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| Motor error | 
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Firmware updating (do not disconnect the battery) |
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In flight:
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Drone arming (blinks for 3s) |
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Armed (motors spinning) |
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| Low Battery | 
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No radio link (emergency landing) |
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