Cisco 12406 Installation And Configuration Manual page 224

Problem Solving with Subsystems
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If the blower module is faulty, you must replace the entire blower module.
If you are still unable to resolve the problem, contact a service representative for
assistance.
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
4-36
The following console monitor message indicates that the system has
detected an overtemperature or out-of-tolerance power condition in the
router:
Queued messages:
%ENVM-1-SHUTDOWN: Environmental Monitor
initiated shutdown
If an environmental shutdown results from an out-of-tolerance power
condition, the output fail LED on the power module will go on before the
system shuts down. Refer to the
section on page 4-23."
Although overheating is unlikely at initial startup, be sure that heated exhaust
air from other equipment is not entering the air filter, and that there is
sufficient clearance—at least 6 inches (15.24 cm)— around the front and rear
of the chassis to allow cooling air to enter and hot air to exhaust.
Check the condition of the two air filters located in slots on the right side of
the chassis. If the air filters appear dirty, remove the filters and either vacuum
them or replace them.
The preceding message could also indicate a faulty component or temperature
sensor. Before the system shuts down, use the show environment all or show
environment table command to display the internal system environment,
including voltages and temperatures measured at each card.
Chapter 4 Troubleshooting the Installation
"Troubleshooting the Power Subsystem"
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