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Action To verify an impeller failure:

1. Place your hand near the exhaust in the router chassis to determine whether the

impellers are pushing air out. If you do not feel much air or no air at all, the impeller is

not working.

2. If the impeller fails, replace it as described in the appropriate hardware guide. The

impellers are hot-removable and hot-insertable. You can replace the fans without

powering down the router.

NOTE: The cooling system components (fans and impellers) do not have

serial numbers. Therefore, you will not see a serial number listed in the

hardware inventory or a serial number ID label on the component.

Documentation

Checklist for Monitoring the Cooling System on page 317•

Replacing a Cooling System Component

The cooling system components are hot-removable and hot-insertable. You can remove

or replace a cooling system component without powering down the system and disrupting

routing functions. However, you should not operate a router for more than a few minutes

without the air filter in place to avoid dust, particles, or other material being sucked into

the router chassis.

To replace a cooling system component, see the appropriate router hardware guide.

Documentation

• Checklist for Monitoring the Cooling System on page 317

M Series and T Series Routers Monitoring and Troubleshooting Guide

Juniper M Series User Manual

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