I have a Concord 80-Plus Furnace that I installed last year. It worked great and this year I was getting it ready for the up coming winter and nothing. I have power and it does nothing. What can I do?

You need to use a meter to find out what is wrong. The t-stat is just a switch and "R" is the power to it, "Y" is ac, "W" is heat, "G" is fan, and if you have "C" it is common, the other side of t-stat. When meter is on voltage and you have a reading it means that circuit is open. Try shorting between R and other terminals to find the problem. DrTom4444