Chapter 5 Troubleshooting the Installation
Troubleshooting the Cooling Subsystem
Troubleshooting the Cooling Subsystem
Check the following to help isolate a problem with the cooling system:
•When you start up the system, do the fans start operating?
To determine if the fans are operating, listen for them. In noisy environments, place your hand on the front of the chassis to feel for air being pushed out of the vents. If necessary, pop off the front bezel to expose the fans and verify that they are operating correctly.
–If yes, the power to the fans is good.
–If no, there is a problem with the fan or power. (See the “Troubleshooting the Power Subsystem” section on page
•The following messages, if displayed, indicate that the system has detected a critical overtemperature condition or
Queued messages:
Although an overtemperature condition is unlikely at initial startup, ensure that heated exhaust air from other equipment is not entering the router’s inlet vent and that there is sufficient clearance around the sides of the chassis to allow cooling air to flow.
The above message could also indicate a faulty component or temperature sensor. Use the show environment or show environment table command to display the internal chassis environment.
If you experience trouble with the startup that is not resolved with these procedures, manually power off the router and contact a service representative for assistance and further instructions.
Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide
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