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Lets start by checking for power from the indoor unit.Do you have a multi meter for troubleshooting?
Do you have model on your indoor furnace or air handler?
Look inside unit in attic and see if maybe there is a small fuse that is blown
I understand. We can go from there. Look for a small fuse on control board.
If no blown fuse we will need to get the meter I mentioned earlier to troubleshoot.
You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.