How do I switch the temperature display from Fahrenheit to Celsius?
The thermostat is factory-set to display temperature in degrees Fahrenheit. To switch to degrees Celsius, adjust screw C on the back of the thermostat out one turn (approximately 360° counterclockwise). This adjustment is shown in the illustration on page 20. (Page 19-20)
From the official Honeywell CT3355 Home Programmable Thermostat manual, page 19
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