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I don't have access to Carrier specs. I'm going to open this backup to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel,you can use the paper clip icon at the right end of the toolbar at the top of this dialog box,Include a picture of the thermostat wire connections to the printed circuit board in the same area.
If there is no paper clip icon, look for the '+attach files' link at left of your send button.
I can mark up the diagram with trouble shooting instructions.
Thanks, ***** ***** compressor #1 runs when you jumper R to Y1, etc.. then the thermostat is defective, that is a correct diagnosis.
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Its easiest to just fit a jumper wire between R and Y1... at the thermostat, then remove it and do it again at the thermostat terminal strip in the unit... that will work best. It will tell you if there is a problem in the other controls or not, it may not be a thermostat problem... if the jumper does not work then you know there is a problem elsewhere in the control system.
If you try another stat, that might work, but you might also have it wired wrong, alsoi it will not tell you if the problem is elsewhere in the system.