I don't know what the deal is with my furnace, but it seems that the flame is back-traveling and tripping the temp-switch. I don't understand whats going on here. I don't believe this furnace has a back draft fan, because the tube goes directly into the vertical exhaust.
What is happening is the tube that is running up the right side of the heat chamber seems to be sucking. This is causing the flame to travel up that tube and heating the surrounding metal up, triggering the heat switch that is just to the left of the tube. Any help would be great, I need to get this running asap, its getting cold out.
