According to my research you also need a Digital Relay Box part PXXACRG12RB to switch from the ACRG11 to the ACRG15. Since you don't have this installed there is a communication error between your Advent Air RV Air Conditioner # ACM150 and the thermostat, which makes sense if you don't have that relay box.
Unfortunately this box was discontinued earlier in April of 2023 so we don't have any more of them, but you might be able to find them elsewhere like at a used parts store.
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