Sorry, didn’t realize any of that was necessary. I don’t know the exact year on the unit, it isn’t listed on the panel with the serial and model number. The trailer is 2003 though so that can give some sort of idea. The thermostat is a Digital Dometic comfort control which I’d say it’s safe to assume it isn’t original to the trailer but has been there the whole time I’ve owned it.. That being said, this is a new problem. The ac has functioned flawlessly for the last 5 years. I think this started the end of last summer when a buddy was borrowing my trailer.
And yes it is also a heat pump. I’ve never used or known how to use it though lol