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Hi my name is Robert...
Do you have a 4 or 5 button comfort control, all the buttons would be in a row from top to bottom, I assume you have the 5 button as the 4 button is obsolete and hard to obtain. This might take some going back and forth. Also if it is the thermostat I am thinking of did you try the reset at the thermostat?
Let me see if I can find some troubleshooting on that, does yours have a button for inside and outside temp? I have troubleshooting on the orginal thermostat but this one has been updated to the style with the led in the center. Robert
I am pretty sure there is an option for a remote sensor for zone 1, zone two would have one but they will use the thermostat or remote sensor for zone 1, I am trying to find some info for you on that particular thermostat. Robert
Click HERE and see page 21. You can see the optional sensor, it would plug into the control box for the AC unit. I might find the control box and check all the connections on that control box it should be marked. Zone two has to have a sensor but zone 1 would have the option of one or sense the temp through the thermostat, normally you would see a small disc on disc on one of the cabinets, it would be about the size of a quarter or smaller. Not sure what else this could be since you replaced the T-stat.
I understand what you are saying and I would verify at the control box that you do not have the optional sensor for that zone, it would also be where the thermostat cable plugs into. If you replaced the thermostat and you do not have a sensor then I suspect the control box inside the AC unit is the problem.
My goal is for you to be satisfied, if you would like to try another expert on this please let me know. Robert
I will request a refund for you, have a nice day. Robert