Hi, we have a Mt. Vernon insert which has run well for many years but is now giving us trouble. On startup, no smoke nor flame appears and the unit goes into MIN FIREPOT TEMP error mode. A retry is unsuccessful. If I prime the firepot myself by dumping in a small scoop of pellets, they will smoke then ignite (so the heating element appears to be working). The stove will run strong from that point but will eventually go out on its own with the same error. The stove was previously giving the VACUUM SW ERROR - I found that the nipple for the vacuum hose on the pellet drop tube was completely clogged - I cleaned that out thoroughly and that error went away. Now we are having this problem. I have removed the auger and vacuumed out the feed tube as best I could. The auger itself looked clean. I don't seem to be able to reach the bottom of the hopper where the auger tube is attached. During startup, I can hear the auger running and *some* pellets drop into the firepot - but I'm not sure if enough pellets are being fed. The fact that the stove will startup fine if I add pellets manually seems to suggest that the pellets delivered by the auger aren't enough to start the fire, nor to maintain it (hence it dies out.) Is there a way to tell (other than the end effects) if the auger is delivering the amount of pellets it should be? Are auger motors typically variable speed? Thanks for any help/suggestions.