Cisco 7200 VXR router User Manual page 168

Troubleshooting the Cooling Subsystem
The above message could also indicate a faulty component or temperature sensor.
Before the system shuts down, use the show environment or show environment table
command to display the internal chassis environment. (See the section "Functional
Overview" in the chapter "Cisco 7200 VXR Product Overview" for descriptions of the
show environment and show environment table commands.)
If you experience trouble with the startup that is not resolved with these procedures, contact
a service representative for assistance and further instructions.
A-12 Cisco 7200 VXR Installation and Configuration Guide