AC,
If the control board made this unit try to work by pressing the test button, and didn't flash the red light, it probably works. This is good for you because you can interface with the brawny parts (relays, contactors, thermistors, etc) directly pretty easily. Interfacing with an arduino would be simple to do. Just throw an addressable switch (DS 2406, DS 2408) in the unit and impose control thru the 1-wire interface. IMHO, this approach would be much easier and cheaper than re-inventing a control board or decoding comms and faking an indoor unit.
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