Cisco Systems UBR10012 manual Symptom Steps to Take, Single FAN Failure, MULTI-FAN Failure LED

Chapter 2 PEM Faults and Fan Assembly Failures

Fan Assembly Module Faults

Table 2-6 Fan Assembly Module Fault Indications and Recommended Action

Symptom	Steps to Take
Fans OK LED is not lit	1. Make sure the fan assembly module is fully inserted into the chassis.
	2.	Place your hand in front of the fan assembly module outlet to determine if the fans are
		operating. If the fans are running, remove the fan assembly module and inspect the wiring
		to the LEDs and fans to ensure that the wires are not nicked or cut.
	3.	Make sure that two AC PEM or two DC PEM modules are installed in the chassis.
		Although only one PEM is required to power the chassis, two PEMs should be installed
		for proper airflow. (If one PEM fails, leave the failed module in the chassis until the
		replacement module can be installed.)
	4.	If you use DC PEMs, make sure the wiring is not reversed.
	5.	Replace the fan assembly module.
SINGLE FAN FAILURE	One fan in the fan assembly module has failed. The fan assembly can cool the chassis
LED is lit	sufficiently with three working fans, but replace the failed fan as soon as possible.
MULTI-FAN FAILURE LED	More than one fan has failed, and the fan assembly cannot sufficiently cool the chassis.
is lit	Replace the failed fans immediately. If necessary, power down the chassis until replacements
	are available.
Fans run but the system	1. Make sure that all intake and exhaust vents on the front and rear of the chassis are free
overheats		of blockages.
	2.	Make sure that the ambient temperature and other environmental factors in the system
		area are within the ranges specified in the “Displaying System Environment
		Information” section on page 1-4.
	3.	Make sure all line cards and blank faceplates are in place. Make sure two PEM modules
		are installed in the chassis. The cooling system cannot operate effectively unless the
		chassis is fully enclosed.
	4.	Check the air filter, and, if necessary, clean or replace it.
	5.	Reduce the ambient temperature of the area surrounding the Cisco uBR10012 chassis.
		This can be done using air conditioning, using fans to circulate the air in the room, and
		closing the blinds on any windows that are facing the sun.

Cisco uBR10012 Universal Broadband Router Troubleshooting Guide

OL-1237-01 2-9