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Turns out the E2 error was because I did not use/connect the factory Freeze/Evap sensor. I didn't think I needed it since it connected to the Furrion AC. The only other thing i did was remove 120VAC power from the control box. It isn't necessary because it fed power from control box to the Furrion AC using a quick connect plug. Just use supplied Romex 120VAC to connect the new AC. Now the factory Furrion Tstat controls the furnace, only, as planned.
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