Q-Logic 2-8C Manuel D’Utilisation

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5 – Diagnostics/Troubleshooting
POST Diagnostics
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5.1.1
Heartbeat LED Blink Patterns
The Heartbeat LED indicates the operational status of the switch. When the POST 
completes with no errors, the Heartbeat LED blinks at steady rate of once per 
second. When the switch is in maintenance mode, the Heartbeat LED illuminates 
continuously. Refer to 
 for more information 
about maintenance mode. All other blink patterns indicate critical errors.
The Heartbeat LED shows an error blink pattern for the following conditions:
„
2 blinks - 
„
3 blinks - 
„
4 blinks - 
5.1.1.1
Internal Firmware Failure Blink Pattern
An internal firmware failure blink pattern is 2 blinks followed by a two second 
pause. The 2-blink error pattern indicates that the firmware has failed, and that the 
switch must be reset. Momentarily press and release the Maintenance button to 
reset the switch.
5.1.1.2
System Error Blink Pattern
A system error blink pattern is 3 blinks followed by a two second pause. The 
3-blink error pattern indicates that a POST failure or a system error has left the 
switch inoperable. If a system error occurs, contact your authorized maintenance 
provider. Momentarily press and release the Maintenance button to reset the 
switch.
2 seconds
2 seconds