What to do if ABB UPS shows Site Wiring Fault Alarm Code 04?
- GGerald HurstAug 20, 2025
The 'Site Wiring Fault' alarm on your ABB UPS indicates a difference of over 15V between the ground and neutral voltage, assuming a Grounding Neutral connection is present. Ensure that Site Fault detection is enabled in the LCD settings menu. Try reconnecting all input wires to resolve the issue.











