Was it working correctly at some time in the recent past? (i.e. not a new installation and/or changed wiring), the "Invert" light is off on the panel and will not come on when you press the button, battery voltage is between 10V and 15V and you don't have a bad battery/cell that pulls the entire bank down the instant the charging voltage is removed, and the unit is well-ventilated and not in thermal overload, the problem is most likely an internal failure which will necessitate taking the unit to a factory authorized service center, since Xantrex does not sell parts or schematics to the general public.

I dont think there is a setup feature..

1.) ensure the inverter is getting power from the ac, use a multimeter to check this.

2.) check Fuse

3.) check its in the propper operating perimeter (voltage amps, etc)

Check the unit itself is getting power,..