Paul -
As I recall, there is a condensate drip pan of some kind built into the air conditioner, probably accessible from the outside. It occasionally happens that the outlet tube (tubes?) gets clogged up with debris of one kind or another - pollen, leaf litter, etc - and then the pan overflows into the interior of the trailer. Once you locate the tubes, it is easy to push a wire, and then a pipe cleaner through them to clear them out.
Spend a little time with the Search tool on this forum - this topic was discussed in a fair amount of detail a couple years back. Or cruise the AIRXCEL site, once you get connected to it. I believe you have the Polar Mach Low Profile 92XX series unit, and there is lots of documentation, including a detailed parts list and exploded diagram.
As for the fan? If it runs once you start it manually, then the fan capacitor is almost certainly the culprit - either bad or disconnected somehow. Again, the AIRXCEL docs will show you where it is and how to replace it. I'm sure you are aware that the fan capacitor is independent of the compressor's two capacitors.
You confused me a bit by saying
Quote:
the trailer was getting colder and colder, and the compressor would not cycle regardless of the temp setting.
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Did you mean that the compressor turned off, and would not turn on? (Which would be normal if it is cold in the room.) Or the compressor came on and would not turn off? (Probably what you meant.) For a number of simple reasons (really wet weather, clogged louvers or filters, misdirected airflow baffles - see the AIRXCEL site), it occasionally happens that the cooling coil freezes over completely with ice. And then the unit does weird things. Since air cannot circulate, the coil's temperature sensor (not the same as the thermostat) may not know how cold or warm it is, and it thinks that the compressor should stay on. And ice formation could be aggravated by water thrashing around from an overflowing condensate drain pan. The solution is simply to turn the whole thing off and let it thaw out completely, and make sure the drip pan drains are clear. Waiting a week will probably have it running right again since the cooling coil will have thawed and the drain pan at least partially drained - but replacing the thermostat may have nothing to to do with it.
Good luck.
Bill