Model light guide
APC Back-UPS LEDs Light Guide
Use this page to compare known light colors, blinking patterns, meanings, and fixes for the APC Back-UPS LEDs.
Quick reminder: This is a model-specific guide. Do not use it for a different model unless the manufacturer says the light codes are shared.
Light status table
| Light | Color | Pattern | Meaning | What to do |
|---|---|---|---|---|
| All LEDs | Multiple LEDs | All LEDs flashing simultaneously | On APC Back-UPS guidance, all LEDs flashing simultaneously signifies an internal UPS fault. | Contact APC technical support with the model number and serial number. |
| Green On Line LED and Yellow On Battery LED | Green and yellow | Green flashing with yellow solid | On APC Back-UPS guidance, a flashing green On Line LED with a solid yellow On Battery LED means the UPS is performing a battery self-test. | Wait for the self-test to complete. |
| Red Overload LED | Red | Solid | On APC Back-UPS guidance, a solid red Overload LED means connected equipment is drawing more power than the UPS can provide. | Move some equipment off the battery backup outlets and reduce the load. |
| Red Replace Battery LED | Red | Solid | On APC Back-UPS guidance, a solid red Replace Battery LED means the automatic diagnostic test determined the battery is near the end of its useful life. | Let the UPS charge overnight, run a self-test, and replace the battery if the warning remains. |
| Yellow On Battery LED | Yellow | Solid | On APC Back-UPS guidance, a solid yellow On Battery LED means the UPS is operating on battery power. | Save work, shut down safely if needed, and wait for normal power to return. |
Before replacing parts
Check the exact light name, color, and blinking pattern. Many devices use similar lights for very different states, such as setup mode, firmware updates, charging, connection attempts, paper jams, or failed pairing.
Source note:
This model page is built from the linked source material below and individual detail pages.