HP Z220 SFF Maintenance And Service Manual page 168

Table 4-10
Screen message
521—Memory fan (3) not
detected
522—Memory fan (4) not
detected
523—CPU fan (2) not
detected
524—Rear chassis fan(2) not
detected
525—Front chassis fan(2) not
detected
526—CPU Liquid Cooling
pump not detected
527—CPU Liquid Cooling
pump (2) not detected
528—CPU requires Liquid
Cooling solution
529—Unsupported WiFi
Device(s) Detected
917—Front Audio Not
Connected
918—Front USB Not
Connected
921—Front USB Not
Connected
156 Chapter 4 Diagnostics and troubleshooting
POST error messages (continued)
Probable cause
Memory fan(3) missing, disconnected,
or defective.
Memory fan(4) missing, disconnected,
or defective.
CPU fan(2) missing, disconnected, or
defective.
Rear chassis fan(2) missing,
disconnected, or defective.
Front chassis fan(2) missing,
disconnected, or defective.
Liquid cooling pump on CPU1 is not
detected.
Liquid cooling pump on CPU2 is not
detected.
Invalid system configuration.
An unsupported WiFi device has been
installed into an internal slot.
Front Audio mechanism is missing or is
not connected.
Front USB mechanism is missing or is
not connected.
Front USB mechanism is missing or is
not connected.
Recommended action
1.
Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
1. Reseat the fan cable.
2. Reseat the fan.
3.
Replace the fan.
1.
Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
1. Reseat the fan cable.
2.
Reseat the fan.
3.
Replace the fan.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
1.
Reseat the pump cable.
2.
Replace the pump.
1. Reseat the pump cable.
2. Replace the pump.
1.
Remove incorrect processor and reinstall original
processor.
2. Remove incorrect cooling solution and reinstall
original liquid cooling solution.
Remove the unsupported device.
1.
Replace or reconnect the missing front audio
mechanism to the system board.
2. Reseat or replace the missing mechanism cable.
1.
Replace or reconnect the missing Front USB
mechanism to the system board.
2. Reseat or replace the missing mechanism cable.
1.
Replace or reconnect the missing Front USB
mechanism to the system board.
2. Reseat or replace the missing mechanism cable.