The AC indicator light (~) on the QuiQ 1500 will flash when AC voltage is below 185VAC. In this state, the output power will be limited to 1200W. Connect it to a 220/230VAC source for full-power operation.
More details on the QuiQ 1500 can be found in the user guide located here:
https://support.delta-q.com/hc/en-us/articles/360016476232-QuiQ-1500-User-Guide