Expert: Oscar V Healer II - 4/2/2007

Question
we have a janitrol gmp075-3 natural gas furnace. Every year we have a problem this year our HSI went bad. our current problem is, when the furnace first turns on, the ignitor turns on, the flame is then produced about five seconds later the flame turns off and the blower starts to run only producing cold air. I don't want to spend a lot of money on having a technician come in and fixing the problem. If you could help I would greatly appreciate it thanks.

Answer
Nick,
Clean the flame sensor , should be located just to the left of the HSI in front of the last burner, single wire going to it, porcelain base and about 1/8th" rod. remove it and use some steel wool or fine emery cloth to clean it, reinstall and try the furnace. Let me know.
Oscar