I have been through this once. Electrician made a mistake. I was at a freinds place in NC. I corrected the wiring myself.
The only damage I suffered was a $145 power supply board for converter. Easy to find, capacitor was blown. I had board drop shipped to where we were, no issue to install with all power and betteries disconnected.
Turned out be no big deal as the A/C unit sounded odd when breaker was turned on. I yelled shut it off and went and looked. The electrician used a dryer breaker. I will always test voltage now, lesson learned.
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