I can't get the second stage to fire on an American Standard AUX100R948W converted to LP. It has a new Vision Pro 8000 Tstat that's programmed for 2 stages. We checked the wireing and gas pressure and found the static to be around 12" that drops to 10" when the low fire is running along with all other gas appliances in the house. You can't get the high adjusted high enough to reach the 10.5-11" that they call for. Both adjs screws are bottomed out in the valve The 2nd stage is supposed to start 10 mins after the first. I also tried to jump the R, W1 & W2 with no results. Could the low gas pressure be the problem?? Should'nt I still be able to get the 2nd stage to fire. Is there a way to test the board with a VOM ?