Well.. Seems as though my supply house in my area has no sources for a control board and/or HSI for a unit I came upon last Wed. 3/19/08 I think the HSI is the flame sensor. I get the unit to fire off after finding a bad HSI but only for 45 sec. The board is an ITT. I would like to know (because I am being lazy) if anyone has an idea of a Honeywell board that uses HSI for flame sencing. can't easily add one due to the fact that the burner is almost like a gun burner like a econo-mite. Many thanks in advance!!