Chapter 2 PEM Faults and Fan Assembly Failures
Fan Assembly Module Faults
Table
Symptom | Steps to Take | |
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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 |
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| operating. If the fans are running, remove the fan assembly module and inspect the wiring |
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| 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. |
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| Although only one PEM is required to power the chassis, two PEMs should be installed |
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| for proper airflow. (If one PEM fails, leave the failed module in the chassis until the |
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| replacement module can be installed.) |
| 4. | If you use DC PEMs, make sure the wiring is not reversed. |
| 5. | Replace the fan assembly module. |
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| |
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. | |
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| |
| 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. | |
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| |
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 |
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| area are within the ranges specified in the “Displaying System Environment |
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| Information” section on page |
| 3. | Make sure all line cards and blank faceplates are in place. Make sure two PEM modules |
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| are installed in the chassis. The cooling system cannot operate effectively unless the |
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| 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. |
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| This can be done using air conditioning, using fans to circulate the air in the room, and |
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| closing the blinds on any windows that are facing the sun. |
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Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
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