3Com 5017C-LS, 5017C with load sharing installation and operation guide See Primary Power LED

Table 2-4. Troubleshooting with Controller Module LEDs (Continued)

LED	State	Possible	Troubleshooting
		Problem	Suggestions
Backup	Steady	The backup	See Primary Power LED
Power	blinking	power supply	suggestions for same
(cont.)	(cont.)	has failed.	State and Possible
			Problem (above).
		The backup	Reinstall the backup
		power supply	power supply and turn it
		is not properly	on.
		installed.
	Two blinks,	The power	See Primary Power LED
	then a pause	load-sharing	suggestions for same
	(in unison	hardware is in	State and Possible
	with Primary	an error state.	Problem (above).
	Power LED)
Temp	Blinking	The	Verify that the fan units
		temperature in	are working and nothing
		the	is blocking airflow from
		concentrator is	the front and bottom of
		too high.	the concentrator.
			Verify at least 1 3/4"of
			space below the
			concentrator for proper
			air flow.
			Lower the temperature in
			the room.
Active	Off	The module is	Verify that the Standby
		in standby	LED is illuminated.
		mode.

2 - 24 ONline 17-Slot System Concentrator Installation and Operation Guide