It sounds like you're trying to control the heat pump on your Advent # ACM150 with your existing thermostat, which is not possible, but I do have a solution for you. The Carrier remote does not have a heat function on it, so there's no way for your existing unit to control the heat function.
The Electric Heat Strip for Advent Air Conditioners # ACMHD can only be operated with the Air Distribution Box w/ Built-In Thermostat for Advent Air RV Air Conditioners - White # ACDB (non ducted only)... view full answer...
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