Error Codes
When the Fault LED is lit press the ON button ‘ ’ briefly to check the
error code. The error codes 1, 2, 4, 8, and 16 are represented by the four
bar LEDs 25%, 50%, 75%, and 100%, and the Overload LED . Each
LED represents a number as shown in the figure below. For example, the
figure below shows the 25%, 50%, and 100% bar LEDs lit. The error code
is therefore 8 + 2 + 1 = 11, or Er11, which indicates that the UPS is over-
temperature.