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Hello and welcome to just answer I am wondering if you have checked to see if taking the batteries out will reset it. before taking the unit off though please do turn off the breaker. Let me know what happens please.
That is definitely something with your system then. Possibly the wiring or just an error with the unit itself. Did you say you are having a service person come to look at it in the morning?
Well sadly there will be nothing more you can do to reset it since the problem is in the ac versus the thermostats.