We had a similar problem maybe five years ago, only with the A/C after a severe storm. The front unit would not work, although, the rear (main) unit was fine. I finally discovered quite a bit of corrosion on the circuit board in the control box below the A/C. I ordered a new box and that solved the problem. In the photo, you can see all the green corrosion on the phone connectors as well as a lot of corrosion on the board itself. I would check the box at your main A/C (if you have two units), as this is where the furnace controls go to that links up with your thermostat.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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