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Were you plugged into shore power and were you using any kind of adapter on your shore cord? Did the fan come on and just not the compressor? The CO and LP alarms sometimes come on when the battery voltage is low. I would check the batteries and the charging to be sure that those items are all good. The A/C uses 12 VDC controls when you have a themostat on the wall, but not a direct vent ceiling control. Let me know which you have and we can go from there. R.J.