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Hello, a 3 amp fuse inside the air handler or furnace could be blown, I need a photo of the wiring diagram glued to the inside of the blower service door. I can mark it up with trouble shooting instructions.
Use the paper clip icon at the right end of the tool bar above or the 'attach files' link to the left of your send button to get the photo to me... it needs to be taken from close up, in very good light and exceedingly well focused.
Include a photo of the thermostat wire connections, with other wires pushed out of the way so that I can see the terminal designations.
We can go from there.