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iandersonAug 12, 2025
Why is the INVERTER LED lighting up with beeping every 4 seconds on my Eaton UPS?
- GgonzalezsharonAug 12, 2025
If the INVERTER LED on your Eaton UPS is lit and an audible alarm beeps every 4 seconds, it means the main power supply has failed. The system is automatically switching to battery mode. Note that when the alarm sounds every second, the battery is almost empty.