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I have a Goodman gas furnace (model GMP 108-3). It recently stopped working. It is an hsi unit. The HSI appears to be working - I don't see any cracks or anything. When I flip the switch at the unit, the fan kicks on, the HSI gets hot and then the top burner lights. Problem is that it doesn't stay lit and it doesn't travel to the burners below it. I took out the flame sensor and cleaned it with very fine sand paper, but that didn't seem to do anything. Any ideas?

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On your flame travel tube sometimes something gets in that and blocks the path. Now this is what I found one time when same problem happened.

I took it apart and found a dead **** roach in the path. Took the bug out and it worked perfectly.

I don't think you have to take it apart just take something and run in the path like a tooth pick or a small screw driver. Maybe a air compressor air gun just enough to blow the path out. let me know if that helps you. ken

I hope this is what you are talking about as I read your post 2 or 3 times to get a idea of what it is exactly.

Posted on Jan 17, 2009

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