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Troubleshooting Cisco 1800 Series Routers (Modular)
OL-5883-01
Problem Solving
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Check for a power supply failure by inspecting the SYS PWR LED on the front panel. If it is
green, the power supply is functional.
• Router partially boots, but LEDs do not go on.
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Check for a power supply failure by inspecting the SYS PWR LED on the front panel of the
router. If the SYS PWR LED is blinking or continuously green, the power supply is functional.
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If the SYS PWR LED is not on, refer to the “Cisco One-Year Limited Hardware Warranty
Terms” section of the “Introduction to Cisco 1800 Series Routers (Modular) Hardware
Documentation” document for warranty information, or contact customer service.
Environmental Reporting Features
If the router is operating at an abnormally high temperature, consider the following causes:
• Fan failure
• Air conditioner failure in the room
• Air blockage to cooling vents
Take steps to correct the problem. Refer to the “Preinstallation Requirements and Planning for Cisco
1800 Series Routers (Modular)” document. See the “Site Environment” section on page 4.
Troubleshooting Cables, Connections, and Interface Cards
Network problems can be caused by cables, cable connections, or interface cards, or by external devices
such as a modem, transceiver, hub, wall jack, WAN interface, or terminal. Check for the following
symptoms to help isolate the problem.
• Card is not recognized by the router.
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Make sure that the card is firmly seated in its slot.
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Check the LEDs on the card. Each card has its own set of LEDs. For information on these LEDs,
refer to the online Cisco Interface Cards Installation Guide.
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Make sure that you have a version of Cisco IOS software that supports the card. Check the
Cisco 1800 Series Cards and Modules online document for software requirements for the
interface card.
• Card is recognized, but interface ports do not initialize.
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Make sure that the card is firmly seated in its slot.
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Check external cable connections.
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Make sure that you have a version of Cisco IOS software that supports the card. Check the
software requirements for the affected card, which can be found in the configuration note for
the card.
• Router does not boot properly, or constantly or intermittently reboots.
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Make sure that the card is firmly seated in its slot.
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Check the router chassis or software.