IBM Storage Networking SAN256B-7 Installation, Service And User Manual page 189

Figure 73. Fan Assembly Numbering
1. Fan Assembly 1
2. Fan Assembly 2
Precautions specific to fan assemblies
Observe the following precautions when replacing fan assemblies.
Note: Each fan assembly contains two fans for a total of four fans for two installed fan assemblies. The
device requires 3 fans out of 4 functioning fans for operation. If hot-swapping a fan assembly, be sure to
have the replacement fan assembly ready to install before removing a faulty fan assembly and replace it
as soon as possible.
Note: If a fan assembly has failed, do not remove it from the chassis unless an FRU is available for
replacement. If the slot is left empty for an extended time period, this could cause chassis air-leakage
and overheating.
Note: Make sure that the captive screws securing fan assemblies to the chassis are tightened. If they are
not tightened, high pressure from fan operation may unseat the fan from chassis connectors.
Fan assembly fault indicators
Use one of the following methods to determine if a fan assembly is faulty:
• Check the fan status LED.
– Steady amber – fan assembly has a failure (full or partial).
– Slow-flashing amber (on 2 seconds, then off 2 seconds) – fan assembly is not seated correctly or is
faulty.
– Fast-flashing amber (on ½ second, then off ½ second) – environmental range exceeded.
Chapter 12. Fan assemblies 165