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Hello, if half of the thermostat touch pad does not work, the thermostat is most likely bad.
If two thermostats operate the system though one central control box, thats called a two zone system... it can get complex.
If you had an **exact* replacement for that thermostat and program it correctly that would most likely effect the repair... it its not exact there can be complications.
Tell me a lot about your technical skill sets and I can coach for half an hour on the diagnosis and repair.
I will be out to lunch now for 30 minutes or so and pick up your response when I return.