My Lennox PI140 insert started shutting down with a error code 2 short red lights. This occurs when the stove has been running for an hour or longer on 1 setting or when you turn the setting down to 1 it will red light after some time. The pellets seem to stop coming into the burn pot and the flame goes out and then the red light. I have not witnessed the process except when it is over so I'm guessing at that sequence. This occurs only on setting 1 when you start on that setting or turn the stove down to that setting. The stove will run forever if the setting is higher than 1 though.