Determining A Fan Failure - Sun Microsystems Sun StorEdge A3500 Manual

8.1

Determining a Fan Failure

The controller module must have proper air circulation. There are several air vents
along the top and sides for both air intake and exhaust. Make sure that these vents
are clean and free of obstructions. Cooling problems occur when obstructions
impede air flow and cause one or more components in the controller module to
overheat.
Two fan canisters cool the controller module: the controller fan canister at the front
of the unit and the power supply fan canister at the rear of the unit.
Note – In the unlikely event that both fans in the controller fan canister fail at the
same time, it may cause one or both controllers to overheat. Under these
circumstances, the amber controller LED on the front panel may turn on. Shut down
the controller module immediately and allow the unit to cool to normal room
temperature. Replace the controller fan using the instructions in the next section,
then turn on the power and check the controller fault LED. It should remain off. If
not, replace the controller.
1. Check the fan fault LED on the front of the controller module.
See Section 4.1 "Checking the Controller Module LEDs" on page 4-2 for LED
location and indicators. If the fan fault LED is lit, the controller fan has failed. Go to
Section 8.2 "Replacing the Controller Fan" on page 8-3.
2. Check the fault LED on the power supply fan at the back of the unit.
See Section 4.1 "Checking the Controller Module LEDs" on page 4-2 for LED
location and indicators. If the fault LED is lit, go to Section 8.3 "Replacing the Power
Supply Fan" on page 8-5.
3. If both fan fault LEDs are lit, replace both fan canisters.
8-2 Sun StorEdge A3500/A3500FC Controller Module Guide • August 1999