Solving Problems
3
Troubleshooting Cisco 3800 Series Routers
OL-5972-01
• With the power switch on and the SYS LED steady green, do the fans operate?
–
If yes, the power system is functioning.
–
If no, check the fans.
• With the power switch on and the SYS PWR LED (Cisco 3825) or SYS PWR1 or SYS PWR2 LED
(Cisco 3845) off, do the fans operate?
–
If yes, the router is receiving power. The fans are connected directly to the DC outputs of the
power supply.
–
If no, check the power source and power cable.
• Does the router shut down after being on a short time?
–
Check for an environmentally induced shutdown. See the next section, “Environmental
Reporting Features.”
–
Check the environmental site requirements in the “General Site Requirements” section on
page 3 of “Preinstallation Requirements and Planning for Cisco 3800 Series Routers.”
–
Check for a power supply failure by inspecting the SYS PWR LED on the Cisco 3825 router,
or the SYS PWR1 or SYS PWR2 LED on the Cisco 3845 router (depending on which power
supply is active). If the LED is green, the power supply is functional.
• Router partially boots, but LEDs do not come on.
–
Check for a power supply failure by inspecting the SYS PWR LED on the Cisco 3825 router or
the SYS PWR1 LED or SYS PWR2 LED on the Cisco 3845 router (depending on which power
supply is active). If the LED is green, the power supply is functional.
–
If the SYS PWR LED is not on, see the “Obtaining Technical Assistance” section on page 12
of “Introduction to Cisco 3800 Series Routers Hardware Documentation” for information about
customer service. For warranty information, see the “Cisco 90-Day Limited Hardware Warranty
Terms” section on page 10 of “Introduction to Cisco 3800 Series Routers Hardware
Documentation.”
Environmental Reporting Features
If the router is operating at an abnormally high temperature, the following message is displayed on the
console screen:
System detected OVERTEMPERATURE condition. Please resolve cooling problem immediately!
Some causes of abnormally high router temperature are:
• Fan failure
• Air conditioning failure in the room
• Air blockage to cooling vents
Take steps to correct the problem. See also the “Site Environment” section on page 4 and the “Equipment
Racks” section on page 5 of “Preinstallation Requirements and Planning for Cisco 3800 Series Routers.”
(340 pages)
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