i have my Vulcan Powerhouse 100 serviced every two years. The DSI light has come on once or twice but the heating didn't stop. just pressed the button. We have had this unit since 1998 and have been told by the technician that there are parts that may die and can't be replaced only solution is the replace furnace.
I would like to know what the star rating is or are they too inefficient to have one.
Baz
June 2014