Tom,
There was a cause for the breakers to trip. By the way it is most common
they don't appear tripped so you did exactly the right technique.
You need to suspect the adapter plug, your extension cord if using, or your
outlet the trailer is plugged into. The breaker (one of the three) tripped
because it saw too much load all at once, or a little. You did the right
thing to lower the locked rotor amps by first letting the fan get up to
speed and the moving on to select cool. That relieves a lot of start load,
but you first said it was running about five minutes and then shut down. It
will do it again! You must find the problem, so before it shuts off again
start feeling the shore power wire for excess heat, first where it connects
to the extension cord if any and then feel every plug-in connection. One of
them is getting too hot and that is going to shut it down again.
The unit cannot last long with this diminished supply beginning to fail at
one of the plug-in points. You must resolve it to avoid compressor or other
component failure. Just feel for where it is getting hot. If the shore power
plug looks all melty, is hot, or the spades and receptacles are turning a
red color instead of bright brass, it is failing, overheating, and left
unattended will either burn up and fail or cause the ac to burn up and fail.
Don't ignore this indicator of a problem.
-Eddie-
Houston, TX