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Do you have two thermostats but only one system?
OK now when you say unit continues to run, does both indoor fan and outdoor unit keep running?
OK now usually with two thermostats, one is main thermostat or master and second one is a zone control or slave.Do you know which is main?
OK now when you say you have to turn off manually.Do you mean with system switch at thermostat or breaker at unit?
This points to a thermostat sensor issue.Is it the middle one that you have to shut to off?
Sounds like the temp sensor is not working .What is model on thermostat.I will see if there is any calibration we might try
Let me see if I can find anything on calibration
Do not see anything that is adjustable as far as the sensor.I would start by replacing batteries and if that doesn't help. look into replacing this thermostat.
If you have further questions, please let me know.
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