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This is no big deal, but I am really puzzled.With my old oil burner and thermostat combination the burner would on rare occasions fire up nicely and then cut off after about a 5 second burn. When that system needed replacing I got a new furnace (of a different brand) and put in a programmable thermostat, and the same occasional 5-second burn is still with me! Oil tank is in the basement, and I have a single-pipe feed. Any thougts has to how I can eliminate the short burns?