I had a call last week where I found a Carrier 8000 furnance with error code 33 Limit circuit fault. The Carrier t-stat had no display. I checked for power on terminal strip on board and no 24v on any terminals. I assumed the board was faulty and I replaced today, just to end up with the same result. Should there not be power off my terminal strip to at least power t-stat? I have no power from r,g,c etc to ground, but the blower runs. I checked the fuse and it checks out.