Callback for new system not running and having an alert code of low voltage supply. I believe the area had some kind of power outage and caused the unit to lose communication with each other (outdoor and indoor unit) I cycled power by turning everything off at the main breaker panel, the equipment is labeled “AH” and “AC”. AH- indoor unit AC- outdoor unit I left the power off for about 30 seconds and then I turned on the AC- outdoor unit first then I turned on the AH- indoor unit for it to do the proper connection and to communicate. After cycling power the system turned on, the alert codes were gone, and the system started cooling the building down.