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Did you set the dip switches properly? Most of the time, this is the problem on a new installation. Check that and get back to me if you still need more assistance as all follow ups are included in our fee. R.J.
The dip switches are on the control board and if you didn't change them they should be fine. I think you just need to program the new CC2 t-stat. You can do the diagnostics on it as well as that manual shows. Were you able to access that and print out a copy?
The control board is visible when you remove the ceiling grill...........gray box. The lid comes off when you remove the screws. Dip switches are very small and hard to read sometimes.