Zone 1 CPU LEDs

Table: CPU LEDs
LED correct operating condition	Fault indication	Probable cause and corrective action
Power-On (green)	Off	System power is not supplied to unit. Check power supply and input power connections.
Power-On (green)	Off	Internal fault. Contact technical support.
Error-Off (red)	On (continuous)	Internal fault. Contact technical support.
	On for one second followed by all LEDs on for five seconds.	Unit went through a reset due to an unrecoverable software error. Contact technical support.
	Flashing	The CPU is decommissioned. Commission the CPU.
Primary control network-flashing (yellow)	Off	CPU lacks active Ethernet communications on the primary control network. Check the primary control network's fiber and cable connections.
Secondary control network-flashing (yellow)	Off	CPU lacks active Ethernet communications on the secondary control network. Check the secondary control network's fiber and cable connections.