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Cynthia CampbellAug 10, 2025
How to fix Fault LED on NXT Power UPS?
- CChristopher PalmerAug 10, 2025
To address a lit Fault LED on your NXT Power UPS, start by identifying the specific error code displayed by the LEDs. If the error codes are Er05 or Er39, check the battery connections and measure the battery voltage to ensure they are charged. Recharge the batteries for about 8 hours if needed and test the UPS's DC backup by simulating a power outage. For an overload, disconnect some non-critical devices from the UPS. Inspect the cables for any short circuits due to damaged insulation and replace if necessary. For Er11, make sure that nothing is blocking the ventilation openings and that the cooling fans are running correctly. If the error code is Er14, verify that the fans are working. If the issue persists or the error code is different, further diagnosis is needed.


