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GT has good incoming AC, but the unit is faulting with a AC Voltage Fault.

The unit requires a operating range from the utility 

operating range for the unit,
utility voltage (L1 L2) @ 240V=212-263Vac  @208=184-228 Vac 
utility voltage (L1 N) @ 240V or 208V=106.1- 131.5 Vac

The unit may have a blown AC fuse. The continuity of the AC can be checked by a qualified person. 
If the fuse is good and the AC voltage is in range, call in for RMA. Proof of warranty status required.
1-PH Tech Support : 714-708-4752
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