Fan modules continually cycle to full speed

If fan modules continually cycle between normal speed and full speed, disconnect all power from the BladeCenter S chassis, wait a few minutes, and reconnect the power modules.

Problem

When you remove a device such as the media tray or a power module from the BladeCenter S chassis, the fan modules will run at full speed. When you replace the device, the fan modules will return to normal speed.

After replacing a device, the fan modules continually cycle between normal speed and full speed for an extended period of time.

Investigation

Perform these steps to resolve the problem:

1. Disconnect power from all power modules in the BladeCenter S chassis.
   Important

   Before disconnecting power, make sure that you shut down each blade server. See the documentation that comes with your blade server for information about shutting down the operating system on the blade server.
2. Wait approximately three to five minutes, and connect power to all power modules.
3. If the problem persists, call IBM support.