I have been rebuilding and getting my ladies 2006 Englander 25-PDV up and running again. So far,. I've worked out a few issues, and got it back to running, but ran into this issue and would like to know a little bit more if anyone can chime in. When I first looked over stove,. the vacuume switch for the upper auger had already been bypassed, by an ex, and she was not sure exactly why he did it. I decided to start by connecting it back up. Ok,.. it seemed to work just fine with it hooked up. The upper auger turned on as it was supposed to, and ran throughout the night, until bottom auger jammed. Fast forward to the next day, after I removed, and cleaned the auger tubes. Get stove all hooked back up,.. hit the start button, and the upper auger is not turning on. Bypass the Vacuume switch,. and auger is now working. So my question,. how does the vacuume switch work, and what is it supposed to be protecting from? Also, what are the chances it could work one day, and not the next? Is it dangerous to use with switch bypassed? Another thing I did notice,.. is when looking thru the brass louver, where I can see rubber hose connecting into the burner chamber,.. is a small crack in the rubber hose. I wanted to do a little research before I just buy a new switch. The hose looks pretty tricky to replace,.. as the louver is glued in? I think this is the last issue I have to work out. Yay!