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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing," on page 23 to determine which components are CRUs and which
components are FRUs.
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
All fan modules are running at
full speed.
A fan module is not working.
104
BladeCenter HT Type 8740 and 8750: Problem Determination and Service Guide
Action
1. Make sure that:
v All other fan modules are installed and working.
v At least one management module is installed and it is active and working.
v The BladeCenter HT unit is not overheating. Use the management-module
Web interface to check the operating temperature within the BladeCenter HT
unit.
2. Check the management-module event log for I2C bus errors. Resolve the
errors before you proceed.
3. Reseat the following components:
a. Fan modules (see "Removing a fan module" on page 83)
b. Multiplexer expansion modules (see "Removing a multiplexer expansion
module" on page 79)
c. Management modules (see "Removing a management module" on page 75)
d. Shuttle (see "Removing the fan shuttle" on page 89)
4. Use a known working fan module to find a fan module that is not working
correctly. If one fan module is not working, the other fan modules will run at full
speed.
5. If another BladeCenter HT unit is available, install the fan modules into the
working BladeCenter HT unit to make sure the fan modules are not defective.
1. Make sure that all power cords are connected to proper power sources and
that the power sources are working.
2. Reseat the fan module (see "Removing a fan module" on page 83)
3. Install a known working fan module into the bay of the nonworking fan module
to isolate the problem to the fan module or to the fan bay.
4. If the problem is isolated to the bay, reverse the locations of the power cords. If
that changes the failing bay, replace the power cord that powers that bay.
5. If another fan module works in the fan bay, replace the fan module.
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