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Appendix A. Data collection and troubleshooting
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Table 18. Cooling system problem indications, solution 1
Table 19. Cooling system problem indications, solution 2
A fan alarm message is received in the Enterprise Manager alarm log
Problem Summary The fan LED is lit red. Enterprise Manager indicates “fan
failure”. TCM display indicates fan failure. System Fan LED
on TCM is lit red.
Probable Cause A fan assembly may not be installed correctly, or may be
faulty.
Action Verify the condition of the fan assemblies. The three upper
fan assemblies should be blowing air out of the rear of the
chassis, and the two side fan assemblies should be blowing
air out of the right side (facing the rear) of the chassis. If
any of the upper fan assemblies are not operational, verify
that the assemblies are firmly seated into the upper fan I/O
connectors on the TMF/TFD module, and the upper fan
assembly housings are latched to the rear chassis frame. If
any of the side fan assemblies are not operational, verify
that the assemblies are firmly seated into the side fan I/O
connectors on the Midplane, and the side fan assembly
housings are latched to the chassis frame. If all connections
and connectors are OK, and any of the fans are still not
operating, replace the defective fan assembly.
A fan alarm message is received, but the fan is not faulty
Problem Summary The Enterprise Manager generated an alarm for a working
fan. This condition is also indicated on the TCM 16-
character display, and TCM System Fan LED is lit red.
Probable Cause The fan sensor is not receiving voltage. This may be due to
a fault in the fan assembly connector, a fault in the Midplane
connections, or TMF/TFD module.
Action Verify that the three upper fan assemblies are firmly seated
into the upper fan I/O connectors on the TMF/TFD module,
and the upper fan assembly housings are latched to the
rear chassis frame. Verify that the side fan assemblies are
firmly seated into the side fan I/O connectors on the
Midplane, and the side fan assembly housings are firmly
latched to the chassis frame. If all of the fans are operating
and a fan alarm message is still present, potential problems
with the TCM module, TMF/TFD, or the midplane could
exist. Attempt to isolate the problem by replacing (one at a
time) the following: TCM module(s); if the alarm still exists,
replace the TMF/TFD module. If the alarm still exists,
possible fault could be in the Midplane connectors. The
midplane cannot be replaced on site. The chassis would
have to be sent back to IBM.