Quick disconnect wiring under unit came loose and was not "clicked" in? Lift up unit and reseat all wiring coming to AC unit. You can also do the same with the plug in the back of the thermostat. It's just an RJ45 like a computer network cable.
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Chris & Donna
2014 Voltage Epic 3990, 600AH Lifeblue, 1895W Solar, 3K Magnum w/AGS, 3X Micro-Air ES
2018 RAM 3500 Laramie Sport Crew Cab 6.7 Cummins, AISIN 4X4 DRW 4.10 Long Bed Dually 2004 Sportster 1200c