Cisco ASR 9001 - Page 119

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If the Fault indicator is on, the power supply is faulty. Replace the power supply.
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If the Temp and Fault indicators are on, an over-temperature condition exists:
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Verify that the power supply fan is operating properly.
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If the fan is not operating, replace the power supply.
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Contact your Cisco representative if replacing the power supply does not fix the problem.
Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
107
Troubleshooting the Installation
Isolating Cooling Subsystem Problems