Cam you give me a bit more information.
1/Tell me what model as on old tstat
2.Tell me what wires went to what terminals
3.Give me model on boiler/controller
4.Tell me where wires attached at controller.
Any pictures would be helpful.
If you have a paper clip icon on your page you can attach using that link.Or
You can upload the pictures using the tiny pic site .
Here is a link to the site.
Click on Browse , select the file from your folder.then click UPLOAD NOW.
They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW
You will see your picture on right side of screen.
Then copy the link URL for email & IM
Paste that link here on the site.