I have a Honeywell RTH7400D programmable thermostat installed and working fine, except that I cannot change the display settings from farenheit to celsius. The package stated that it was both farenheit and celsius capable but the manual does not tell you how to switch it. I live in Canada - everything is in celsius except my thermostat.
Re: switching thermostat from farenheit to celsius
My thermostat was set on celsius and couldn't get it to change back to fahrenheit. My son suggested pressing both up and down arrow buttons at the same time and it worked. It changed back to fahrenheit.
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Press and hold up and down temp buttons together to enter settings menu. Then press up to option 14. Press down to change to option 0 (Fahrenheit). 1 is Celsius. Press up and down together to save and exit. Good Luck!!
Just mark the old wires on the old thermnostat...R , W etc...and put them on the same terminals on the new 1.....also there should be some adjustment ire : switch on the back or under the cover to adjust for Hot water heating or electric heat...either is the setting you should have it on....also you shouldn't setback the thermostat at night or when away very much....2 degrees is fine , as the boiler will run along time to raise the temperature in the morning and may not get there by the set time
You need to go into the setup mode to change it. Push and hold the i button along with the increase and decrease buttons. All the segments on the display will appear for about three seconds, then setup number will appear to the left and factory setting to the right. Change the setup number by pressing the (i) button until you get to 14. This is the degree temp. display, factory setting is 00. Use the arrow up key to change to 01 (celsius).To exit setup, push and hold the(i) key until the display returns to normal.