The breaker for your AC “should” be a single handle 20A breaker. Suggest you unplug your rig from shore power, remove the panel cover, pull the breaker out and check the wire connection and look at the buss and breaker to make sure not discolored. If good, replace the breaker, turn off and on three times. Plug your shore back in and verify voltage coming from breaker. HAVE SOMEONE TURN ON AC while you watch the breaker.
If it is on a 15 amp, could have been incorrectly connected. Swap with the one on the 20A.
Let us know what you find.
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