Nokia 500s Appliance OverviewNokia 500s Installation Guide 31Fan UnitThe 500s appliance fan unit is a single unit made up of eight individual fans toprovide the air flow required to maintain a proper operating temperature. Thefan unit can provide proper airflow for a short time even if an individual fanfails.CautionIf an individual fan fails, replace the fan unit as soon as possible. Forinformation about how to replace a failed fan unit, see “Installing aFan Unit” on page 119.The system status LEDs on the front panel of the appliance show the status ofthe fan unit. For more information about the system status LEDs, see “SystemStatus LEDs” on page 24.Table 6 Power Supply Status LEDsLED LED status MeaningFault Red Power supply has a voltage problemand power was turned off.orOne power supply in a redundantsystem is not turned on.Over Temp Yellow Power supply has an internaltemperature problem. All power to theunit is turned off. After the internaltemperature returns to normal, powerwill be turned back on.PWR OK Green Power is on and the power supply isfunctioning properly.
