Ok,now the refr is working normally. I determine this by using diagnostics and reading fin temp. We the unit starts to warm up, there is no fault code displayed. We usually notice warm milk first. Then, after checking for warm to hot tubing outside, I will usually turn the unit off for a couple minutes. After turning back on, I just have an "n" displayed. Not " no", or "no cold". Just "n". When I run fault code displays, there is a segment that shows there has been a thermistor fault sensed by the control. That is where I get the thermistor failing. If I knew what a normal ohm reading should be, like at room temp, or, say, 40 degrees, I could test that. I have never found that info
I have also not found a reason the display shows "auto" and "AC", then the AC shuts off and no cooling or other operation is taking place. If I set manual AC or propane it stays lit and that's how I get cooling back. Later, while stationary, I can reset mode to auto AC and it will continue to operate.
That's my story, and I'm stickin to it!