So our HVAC display has been acting weird off and on as of late and just recently it reverted to celsius instead of fahrenheit and we cannot get it to switch back. On the flip side of it, it has not bee acting funny.

Any ideas as to how to switch it back to fahrenheit?

 

That would be on page 3-152 of your owners manual:



Press and hold AUTO and then press and hold OFF for 3 or more seconds.