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I feel stupid asking... but in this heat wave, I'm too hot to worry. The roof unit, Mach 3 PS, on an Airstream - plugged in at a campground, worked perfectly until we moved it to here. The air blows hard and very cold for about 3 minutes, then just stops blowing. I cut the unit off. No sounds or smells. The unit is still "humming", just no air. The filters, inside, are clean. The fan, up inside the ceiling, turns feely. After about 8 minutes I can turn the unit back on, it repeats the same sequence. I have no manual to follow, or any expertise in this area. Ideas, please. Thanks in advance, Shine
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