Last season my Dvc went down after I did a clean out at the end of the prior season. I spent weeks on the forum getting all sorts of advice when in the end it was my own carelessness.
Check out all the great tips I got here..... http://nepacrossroads.com/about21985.html
1. There is a probe in the exhaust shaft. I've run a cleaning brush thru there plenty of times, apparently I bent it and broke the ceramic core. It's easy to check this probe, it's on the left side you look at the stove, sticking into the exhaust shaft. Might be worth checking. There's another temperature probe on that same side of the stove but its far less likely to be damaged, it's tough to get to.
2. I had the control panel off. There is a clear tube that runs from the pressure sensor in the control panel box to the main box. This tube can be seen near the fines tray door. Make sure this tube is connected, not cracked and as was in my case, pinched after I put the control box back on.
No blink codes? That's odd.....