Thankfully my dog woke us up as the house was getting smokey since my smoke detector (which had a new battery as of the time change) failed as well. What a night. So I went downstairs and found smoke coming out of the hopper. When I opened up, I could see the orange glow of the pellets down near the feed. I immediately started scooping out the unburnt pellets into my ash bucket and as I kept scooping, the pellets were getting more air and flaring up. Not a fun situation. So, I wound up putting a little bit of water on it to knock it down so I could keep getting the pellets out. Finally got it all settled after about an hour and took the stove apart to make sure I didn't miss anything. Now I'm trying to figure out what went wrong and if the stove is still functional. Stove - Quadra-fire Castile insert When I went through the stove and checked the safety devices to see what tripped. Snap disk 2 - overfire did not trip Snap disk 3 - burnback into hopper DID trip So, I'm confused as to why I had the problem unless my snap disk 2 is bad. It looks like inside the fire box got VERY hot. Everything is black and orange with pellets burnt outside the fire pot, almost like it kept feeding. Glass is totally black. Overfeed and overfire? My exhaust motor also seems to have issues now as well as it seems tougher than normal to turn. Could the heat have cooked the bearings? Or maybe the motor failed and caused the chain of events? The auger is cooked black and shiny. Not sure if the motor is still good or not. I'll have to check this later today. As far as maintenance goes on the stove. I had done my weekly cleaning about 3 days earlier. This is the tear down cleaning the heat exchangers and behind the fire brick. I clean the firepot daily so that should have been fine. Pellets - I only use New England Wood Pellets which seem to be the best as far as quality goes from the other brands I bought. I'm at a loss. I think it had to be a multiple failure of items to cause it. I've always felt safe running the stove overnight or while I'm gone, but this has me second guessing. Also, I've got to see if I can clean the stove since the hopper and and the feed tube are all burned black. I'm hoping that I can. I plugged the stove in and it didn't even turn on so I'm assuming that the fact that the safety switches were tripped caused it. Any help or advice is appreciated. Thanks.