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Check the LED indicators: Most UPS units have LED indicators that show the status of the unit. Check if the LEDs are lit up and if they indicate the correct status. For example, if the UPS is providing battery backup power, the corresponding LED should be on.
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Perform a self-test: Most UPS units have a self-test feature that checks the internal components of the unit. You can perform a self-test by pressing the test button on the UPS. During the test, the UPS will switch to battery power and then switch back to AC power. If the self-test passes, it means the UPS is working properly.
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Check the battery: The battery is the most critical component of the UPS. Check the battery status indicator on the UPS or check the software that came with the UPS to see the battery status. If the battery is low, replace it as soon as possible.
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Test the UPS under load: You can test the UPS under load by connecting a device to the UPS and then unplugging the UPS from the wall socket. The UPS should be able to provide backup power to the device for a few minutes before shutting down.
