Field Notice: FN74118 - Some PWR-CC1-500WAC Power Supplies May Show Incorrect Power Readings in Cisco IOS XE Software, Resulting in Incorrect Fan Speed Control - Hardware Upgrade Available

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Updated:May 1, 2024

Document ID:FN74118

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Notice

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Products Affected

Affected Product Name	Description	Comments
PWR-CC1-500WAC	Cisco C8300 1RU AC Power supply with PoE

Defect Information

Defect ID	Headline
CSCwi62291	PWR-CC1-500WAC has incorrect power reading and may overheat

Problem Description

On affected Cisco C8300-1N1S-6T and Cisco C8300-1N1S-4T2X Routers, incorrect power readings are reported in Cisco IOS XE Software, resulting in incorrect fan speed control of the power supply. For affected routers that are running in nonredundant power supply mode, the power supply may eventually overheat and cause the router to shut down.

Background

Affected routers contain power supplies that were manufactured with incorrect calibration of the current sensing circuitry. This problem only affects the 500-watt power supply with product identifier (PID) PWR-CC1-500WAC. Affected power supplies report incorrect power readings to the operating system software and can cause the software to set the cooling fan speed incorrectly.

Problem Symptom

Affected Cisco C8300-1N1S-6T and Cisco C8300-1N1S-4T2X Routers with incorrectly calibrated power supplies will report incorrect power values in Cisco IOS XE Software. Power values can be observed by entering the show environment | incl Watts CLI command.

In the example below, the output power is listed as 3W and 6W, respectively; this is incorrect and abnormal.

Router#show environment | incl Watts

P0          P: In pwr       Normal          30    Watts     na

P0          P: Out pwr      Normal          3     Watts     na

P1          P: In pwr       Normal          42    Watts     na

P1          P: Out pwr      Normal          6     Watts     na

P2          P: pwr          Normal          2     Watts     na

R0          P: pwr          Normal          43    Watts     na

In certain router configurations, it has been observed that due to the incorrect power reading in the power supply unit (PSU), the cooling of the PSU can be compromised so that when it is running in nonredundant power supply mode (one PSU is unpowered), the PSU may overheat, resulting in the system shutting down.

Workaround/Solution

If a power supply is confirmed to be affected using the Serial Number Validation Tool, request a replacement.

How to Identify Affected Products

Serial numbers of the affected power supplies will have the first nine characters DCI2441T0 or DCI2507T0. If the first 9 characters do not match one of these, then the PSU is not affected. If the first 9 characters do match one of these, then use the Serial Number Validation Tool to confirm whether the PSU is affected.

Add show inventory command:

sh inventory



+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

INFO: Please use "show license UDI" to get serial number for licensing.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++



NAME: "Chassis", DESCR: "Cisco C8300-1N1S-6T Chassis"

PID: C8300-1N1S-6T     , VID: V01  , SN: FDO2530M03Z



NAME: "Power Supply Module 0", DESCR: "500W AC with POE for Cisco C8300 1RU"

PID: PWR-CC1-500WAC    , VID: V01  , SN: DCI2507T0P5



NAME: "Power Supply Module 1", DESCR: "500W AC with POE for Cisco C8300 1RU"

PID: PWR-CC1-500WAC    , VID: V01  , SN: DCI2507T0P9



NAME: "Fan Tray", DESCR: "Cisco C8300 1RU Fan Assembly"

PID: C8300-FAN-1R      , VID:      , SN:

Serial Number Validation

Cisco provides the Serial Number Validation Tool to verify whether a device is impacted by this issue. To check the device, enter the serial number in the Serial Number Validation Tool.

Important: For security reasons, you must click the Serial Number Validation Tool link that is provided in this section. Do not copy and paste the link into a browser. Use of the Serial Number Validation Tool URL external to this field notice will fail.

Upgrade Program Information

Support Case Manager (SCM) must be used for ordering replacement parts for this Field Notice. To open SCM in a new tab, click the following link:
https://mycase.cloudapps.cisco.com/fieldnotice?fn=FN74118

SCM will validate eligibility and ensure that a request for a particular serial number has not already been submitted. If there is already a request, SCM will indicate RMA already submitted and NOT eligible for replacement.

Provide the following information:

Affected serial numbers. Note that a serial number entitlement check may be performed.
One ship-to address per request.
Service Request number (SR#). This is not required, but if one exists, enter it for better tracking purposes.

Order entry supports up to 50 serial numbers per request. For more than 50, submit additional requests.

Revision History

Version	Description	Section	Date
1.0	Initial Release	—	2024-MAY-01

For More Information

For further assistance or for more information about this field notice, contact the Cisco Technical Assistance Center (TAC) using one of the following methods:

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