How to change Honeywell TH3210d1004 thermostat from Celsius to farenheit

Maybe not your tstat but the only thing I can find is on the back of the tstat there are screws labeled ABCDEF. C is the Fahrenheit/Celsius adjustment. tu

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On the Luxpro PSD111, Farenheit or Celcius are selected using the Jumper Switch J2 on the rear of the unit's circuit board:
Open = Celcius
Closed = Farenheit

you need to change the differential pressure to 3 degrees.that means the unit will not kick on unit it is 3 degrees warmer then the setpoint

Press both up and down buttons for 5 seconds
Release
press both up ans down buttons for 5 seconds again
Release
14 and ? small 0 will appear. Z?ro is for farenheit.
Use th? up arrow to change the 0 to 1 for celcius

Press and hold the ON button for 5 seconds. That should switch it to farenheit.

Hope this helped you.

Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

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.

go to myhome.honeywell.com and search for a manual for your model number thermostat on the right hand side of the page

When you do your system setup, Function 320 controls your temp. format. Set Function 320 to 1(celsius); Then press DONE. This will solve your problem.( Function 320 is defaulted to 0-Farenheit).

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.