Purchased this stove used this spring. Finally got it installed. We are venting it straight up and out adapter T right out the back, 12 ft of 4" duravent straight up. When I purchased the stove they said the motor was a bit loud. I was like can't be that bad, and they could get a replacement for $100. Purchased the stove for $400. Anyhow, got it installed on Saturday and fired it up. It will burn for 3 hours on low and then it is like a high limit is triggered and the stove goes dead for 10 minutes until it cools down. If on the highest setting you get about 25 minutes. Check all the wires and such, and they had the exhaust fan unplugged. DAMN that beast is loud! I found the noisy motor! So I plug it in, give it a drop of oil and it quiets down a bit. I figure no problem, I found the problem. Now it will burn for 6 hours on low and 45 minutes on high. So I start checking more stuff. Wire is broken off the contact on the low limit on the back side of the exhaust pipe. So I fixed that. Still shuts down. Anyone have any ideas? I have cleaned it, it is immaculate, I became rather intimate with this stove today with all the cleaning and tearing apart to check for plugs and build up.