Press and hold the up arrow and fan buttons until the display changes. Then press Next until you see 14 in the display. Change this value to 1 (with the up and down arrows) to get Celsius. (O is Fahrenheit.) Press Done to exit and save the setting.
The manual is available here: http://customer.honeywell.com/Honeywell/ProductInfo.aspx/TH6110D1005 . Scroll to the bottom and choose a manual then press Download. This particular section is in the Installer's Guide.
Answers & Comments
Press and hold the up arrow and fan buttons until the display changes. Then press Next until you see 14 in the display. Change this value to 1 (with the up and down arrows) to get Celsius. (O is Fahrenheit.) Press Done to exit and save the setting.
The manual is available here: http://customer.honeywell.com/Honeywell/ProductInfo.aspx/TH6110D1005 . Scroll to the bottom and choose a manual then press Download. This particular section is in the Installer's Guide.
I hope this helps.
Cindy Wells