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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 PSn 12V OC Fault has
transitioned to non-recoverable.
(n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Check the power-supply LED
on the EasyLED panel (see
“EasyLED diagnostics” on
page 76).
2. Remove the power supplies.
3. Replace power supply n.
4. (Trained service technician
only) Replace the system
board.
(n = power supply number)
Sensor PS n VCO Fault has
transitioned to non-recoverable.
(n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Check the power-supply LED
on the EasyLED panel (see
“EasyLED diagnostics” on
page 76).
2. Replace the failing power
supply.
(n = power supply number)
Redundancy Power Unit has been
reduced.
Error Redundancy has been lost
and is insufficient to continue
operation.
1. Check the LEDs for both
power supplies.
2. Follow the actions in
“Power-supply LEDs” on page
88.
Redundancy Cooling Zone 1 has
been reduced.
Error Redundancy has been lost
and is insufficient to continue
operation.
1. Make sure that the connector
on fan 1 and fan 4 (if
installed) is not damaged.
2. Make sure that the fan
connectors on the system
board are not damaged.
3. Make sure that the fan cage
is correctly installed.
4. Reseat the fan.
5. Replace the fan.
Redundancy Cooling Zone 2 has
been reduced.
Error Redundancy has been lost
and is insufficient to continue
operation.
1. Make sure that the connector
on fan 2 and fan 5 (if
installed) is not damaged.
2. Make sure that the fan
connectors on the system
board are not damaged.
3. Make sure that the fan cage
is correctly installed.
4. Reseat the fan.
5. Replace the fan.
50 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual