Hi there, my name is Pete. I am a brand new member (although I have been lurking for quite some time). I have been trying to analyze my vacuum problem (namely, I am registering no vacuum at the nipple adjacent to the auger chamber). Background: I purchased my QF Castile insert second hand about three years ago. It was working great until a few months ago when the pellet stove stopped feeding pellets. After cleaning the entire stove thoroughly to no avail. I tried jumping the vacuum switch and immediately the pellet stove cam back to life. Pellets feed properly and auger functions properly so long as I jump the vacuum switch. In an attempt to determine the problem I took the following steps: 1.) I attached a vacuum gauge to nipple adjacent to the auger chamber (where the vacuum hose is normally attached for vacuum switch) and found that I have nil ("0") vacuum at the nipple; 2.) I checked the fire-pot ash door and determined that the ash door was completely closed; 3.) I removed and cleaned the pipe from the pellet stove to the woodstove liner and adapter (I attach the 4" pellet stove piping to the woodstove liner/adapter) which then goes up my chimney. I little bit of ash but not too bad. 4.) Chimney damper is confirmed open; 5.) I checked the door seal on the pellet stove and found that only three ("3") sides of the door have a seal (no seal on top of the door). After reading up on this issue it appears that this lack of seal is not a problem as it appears that QF did not include this seal in order to provide an "air wash." 6.) I removed the exhaust combustion blower and vacuumed the inside of the passage way (where there was little ash and grit). And, I cleaned all the residue off the combustion blower fins and then reinstalled the blower while utilizing GM RTV Engine Sealant as the gasket (on top of the fiber gasket. 7.) I hooked my vacuum pump (which I usually use for AC evacuation) to the nipple adjacent to the auger chamber. And, I found that the pump (which normally develops one atmosphere or 29"hg) was creating 5"hg of vacuum. Once pump shut off then the vacuum immediately dropped to nil ("0"). 8.) I paid particular attention to exhaust combustion blower after reinstalling it (described above). So that when I restarted the pellet stove (with vacuum switch still jumped), I noticed that this blower started very slowly (is it possible for this blower to be running below optimal speed despite being on high). Questions for the Hearth Experts: a.) What should I check next? b.) What rpm should the exhaust combustion blower run at? c.) Is it possible that the exhaust combustion blower is running too slowly? d.) Does anyone have a better way of finding pellet stove vacuum leaks? Any help that could be provided would be greatly appreciated. I am racking my brain on this problem (I have fixed a lot of vacuum leaks on cars over the years but this one has me stumped).