To set the unit to Fahrenheit, for controls that have a dip switch located under the batteries like the one shown in the following image.
you must first remove the batteries. Second, adjust the dip switch to the positions where they are set to HEAT and F/ON respectively. Finally, wait 30 seconds with the batteries removed. Once this is done and the batteries are reinstalled in the control, the unit should now be in Fahrenheit.
To set the unit to Celsius, repeat the previous steps but change the position of switch 2 to the letter C/OFF instead of F/ON.
If your remote doen't have a deep switch located under the batteries like the one shown in the following image
Then you must press and hold the fan botton for 5 seconds after that time the simbol in the remote will change from C (Celsius ) to F (Fahrenheit ).