Thank you for choosing the Aprilaire thermostat.

The directions for changing the display to read Celsius is as follows:
1. Set the mode to the off position
2. Hold the "up" arrow and "mode" buttons together and hold until the display changes.
3. Press the "mode" button until the display shows menu "01"
4. Press the "up" arrow to change the smaller case blinking "0" to "1".
5. press the "mode" button (multiple times) until the word "done" appears

This should save the settings and exit back to the main screen; now showing temperature in Celsius.