What to do if my Emerson Liebert GXT MT+LB 10KL has Fault 1A?
- JjustintuckerSep 8, 2025
If your Emerson UPS indicates Fault 1A, it means the UPS output power is negative, indicating energy feedback into the UPS from the output. This may be due to a regenerative load or current control failure in a parallel system. Contact the dealer.