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  1. O

    Suburban SF30F Furnace Issue - Popback?

    Thanks Gary. That is what I thought also. But I looked everything over carefully and could not find any issues. The gas inlet tube is solid, and I blew out the jet. No problems there. The burner itself looks good. And the heat exchanger does not appear to have any holes. I am stumped. I was...
  2. O

    Suburban SF30F Furnace Issue - Popback?

    Hi All, My first time here with a problem. I have a weird gas furnace issue in my RV I need advice on. It's a propane powered Subrban SF30F furnace, probably from 2002. It will be running fine, gas burner has lit and fan is blowing heat. Then there will be what sounds like a second gas...
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