I am running my enviro windsor for the first couple times. It is a recent install and my first trip down pellet alley. The stove burns starts up well, and burns nice. I can control the heat setting 5 ways, and it runs like a champ on the first four. Except that whenever I kick it into high, it runs for about 15 minutes, then shuts down. The control board flashes the #2 code which has to do with vacuum in the exhaust. I have a factory service manual so I have checked the obvious problems outlined there. Is there anybody who might have had this problem?