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E9000 Server V100R001 HMM Alarm Handling 19

This document describes E9000 server alarms in terms of the meaning, impact on the system, possible causes, and solutions.
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Fan: Fan Fault (Minor, FanN Fault)

Fan: Fan Fault (Minor, FanN Fault)


Alarm message:

Transition to non-critical from OK

This alarm is generated in one of the following scenarios:

  • The fan speed detected by the fan fault sensor is over 15% but the actual speed is less than 10%.
  • The difference between the speeds of the two fan units in a fan module is over 30%.

This alarm is generated by the following sensors:

FanN Fault


Alarm ID

Alarm Severity

Auto Clear








Slot number of the fan module.

Impact on the System

The temperature of the system and components is high and components cannot operate properly or are event burnt. If the fan speed is 100%, the noise is loud.

Possible Causes

  • The fan is blocked and stops rotating.
  • The fan signal cable is disconnected.
  • The communications channels between the MM910 and the fans are faulty.
  • The fan is faulty.


  1. Exchange the positions of the faulty fan module and a normal fan module. Then check whether the alarm is generated for the original or normal fan module.

    • If the alarm is generated for the faulty fan module, go to 2.
    • If the alarm is generated for the normal fan module, go to 3.

  2. Replace the fan module. Then check whether the alarm is cleared.

    • If yes, no further action is required.
    • If no, go to 3.

  3. On the HMM WebUI, choose System Management > Information Collection, and collect logs.
  4. Contact Huawei technical support.
Updated: 2018-08-16

Document ID: EDOC1000015902

Views: 208283

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