2017 Thor Compass a/c works on generator but not 30 amp

Thanks for all the responses. The a/c works on the propane generator but not 30 amp. Both the 30 amp outlet and the 30 amp cord from the outlet to the rv test out fine. There are no appliances on at the same time except the refrigerator and some lcd lights. We haven't tried the on-demand water heater yet. I will double check the twist connection, though we've had that on the previous two rvs with no problems. Guess I call Thor tomorrow.