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Hello, I have 55 years in the business, much of it with Trane equipment.. If Trane cannot help and your local qualified Trane contractor cannot help, I will not be able to solve the problem from here without heroic efforts and a lot of time spent... hours at the least.
Let me know if you would like me to work with you on this for a while with no promises or not... if you do want me to spend the time I would need a positive rating so that I do not end up spending hours without compensation,
OR... I can opt out. let me know, we can go from there. So far I think the problem is with the electronics, possibly a mismatch between components.
Components can be mismatched from the factory or clear back to the component level, in this case the printed circuit board....OR.. there can be defects from the factory that made the printed circuit card (mostly in china these days)...there are ways of simulating the outdoor 25F condition (use of a resistor to replace the thermistor sensor that is sending the 25F signal).. this will take me hours however. ..and with no guarantee at all from me.
Let me know if you like to insure that I do not spend those hours at my own expense and I will dive into this for you without a limit. Meantime I will opt out and we can see if anyone else here wants to take the chance.