The Dometic a/c units are known for "freezing up" if run on low all the time. Over the past 3 summers w/ my 3400RL, I have learned to leave the a/c in the "ON" mode and on "HIGH". I also let it dump into the living room and use the bedroom a/c to cool off the front half. I had the return airbox re-sealed this spring which seems to have solved the problem of tripping the breaker.
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