Fujitsu PRIMERGY RX2520 M5 Upgrade And Maintenance Manual page 214

Fans
▶
"Switching on the server" on page
When a system fan module fails, the remaining fans will start
operating at full speed. After the defective fan module has been
replaced, all fans will continue to run at full speed for a couple of
minutes, before resetting to a lower speed.
Ensure that all system fans reset to a normal operating speed.
▶
"Performing a fan test" on page
214
57.
98.
Upgrade and Maintenance Manual RX2520 M5