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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 8, “Parts Listing, TD200x Machine Types 3719, 3821, 3822, and 3823,” on page 237 to
determine which components are customer replaceable units (CRU) and which components are field
replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Sensor Sys Board Fault has
transitioned to critical from a less
severe state.
Error A sensor has changed to
Critical state from a less
severe state.
1. Check the system-event log.
2. Check for an error LED on
the system board.
3. Replace any failing device.
4. Check for a server firmware
update.
Important: Some cluster
solutions require specific code
levels or coordinated code
updates. If the device is part
of a cluster solution, verify
that the latest level of code is
supported for the cluster
solution before you update
the code.
5. (Trained service technician
only) Replace the system
board.
The Power Supply (Power Supply: n)
has Failed.
(n = power supply number)
Error Power supply nhas failed.
(n = power supply number)
1. If the power-on LED is lit,
complete the following steps:
a. Reduce the server to the
minimum configuration.
b. Reinstall the components
one at a time, restarting
the server each time.
c. If the error recurs, replace
the component that you
just reinstalled.
2. Reseat power supply n.
3. Replace power supply n.
(n = power supply number)
Sensor PS n Fan Fault has
transitioned to critical from a less
severe state.
(n = power supply number)
Error A sensor has changed to
Critical state from a less
severe state.
1. Make sure that there are no
obstructions, such as bundled
cables, to the airflow from the
power-supply fan.
2. Replace power supply n.
(n = power supply number)
46 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual