I awoke last night to sound of our smoke detector and a living room filled with smoke. No blowers on, nor any lights at all on the control panel, but a smoking fire in the burn pot, leaking out door seal. I was not thinking straight cause I just woke up, and just concentrated on clearing the house of smoke while the fire died down. I was convinced that something had gone haywire with the control system. In the morning I pieced together what happened, and was able to duplicate the conditions again to confirm my theory. As a result, I can’t believe the control system was designed this way. I’d like the opinion of any folks on the forum as to how their brand of stove operates in this scenario. (First let me say that my stove is vented straight out the side of the house, then up 6 feet, terminating with 2 45-degree elbows to pitch slightly downward. This normally gives plenty of natural draft to clear fire box in case of a power failure, but not in this case). I have the stove connected to an auto-set-back thermostat, set to turn down to 65 degrees at 10:30 PM, and back up to 70 degrees in the morning. I run the stove in two modes, depending on how cold it is out, The first mode is for cold days, where the stove cycles from highest output to lowest, depending on if the thermostat is calling for heat. The second mode, which I was running in last night shuts the stove completely down when the thermostat is not calling for heat, and goes through an ignition cycle when its time for heat. This mode is for warmer weather when it would be too hot in the house even with the stove on its low setting. Well last night, shortly before 10:30 the stove must have started an ignition cycle. The fire started, but before any heat could build up, the thermostat kicked into 65 degree mode. The combustion blower shut down, and without any heat built up there was no natural draft, and the smoke came flowing out. The root cause of the problem IMO is that the presence of a “fire” is detected by a heat sensor (not a visual flame sensor like is typical on oil burners). If the heat sensor does not think there is a fire, when you turn the thermostat down it shuts off the combustion blower. My real gripe is that they could have designed the controls to err on the side of caution, and keep the blower running for say 10 minutes IF the thermostat opens AND the ignition cycle is still in-progress (heat sensor trip point not yet reached). I can’t believe this is my 3rd season and this is the first time by chance that the set-back kicked in shortly after the fire started.