Furnace exchaust makes thundering like noise

Discussion in 'General RVing' started by Adam, Mar 10, 2003.

  1. Adam

    Adam New Member

    My furnace makes a "thundering" noise out the exhaust port intermittently, sound like when someone pulls up next to you with one of those super bases in their car! It does it for a few seconds and then the noise disappears again and may not happen for a couple of days. I feel its got to have something to do with the mixture but not sure where to start. Any ideas?
     
  2. Gary B

    Gary B Senior Member

    Furnace exchaust makes thundering like noise

    Hi Adam, don't think its the mixture, but would be supisious of the ignitor, the ignitor electrodes may not be properly adjusted, and maybe sparking in the wrong area and not igniting the LP gas right off letting the burner area fill with LP then it ignites with a bang. On second thought check the air intake tube and area it could be drawing in exhaust thus killing the flame temperarily then reigniting with a bang, guess that would be mixture. Good luck. :)
     
  3. ARCHER

    ARCHER Senior Member

    Furnace exchaust makes thundering like noise

    Might also be the intake/exhaust tubes could have critters/spider webs, etc., in them. Check it out. :)
     
  4. Adam

    Adam New Member

    Furnace exchaust makes thundering like noise

    :) Thanks for the replies Gary and Archer, I am looking through the furnace owners book right now so I can figure out how to access the furnace burner area. I will post what I find as an answer.
     
  5. Kirk

    Kirk Senior Member

    Furnace exchaust makes thundering like noise

    Since you have not yet returned with a solution, I'll offer another thought. Could the problem be something loose that is at times vibrating?
     
  6. Adam

    Adam New Member

    Furnace exchaust makes thundering like noise

    :) Thanks for the thought Kirk, but as of yet I have not figured out how to remove the unit from my trailer to inspect. I am planning to do it this weekend. I probably would feel better taking it to a dealer, but the problem is to intermitten, and at $60. per hour it would add up fast!
     
  7. Butch

    Butch New Member

    Furnace exchaust makes thundering like noise

    If the furnacd problem is on that 2003 Artic Fox, is it not under warranty??? If so why would you worry about the $60 per...
     
  8. Adam

    Adam New Member

    Furnace exchaust makes thundering like noise

    Hi butch, the dealer, like the factory said by desciption it sounds like a insect/web has gotten into the burner area which would not be covered. So I thought I would check for that first myself before taking it in!
     
  9. Adam

    Adam New Member

    Furnace exchaust makes thundering like noise

    Well I finally figured out how that darn furnace comes out, with the aid of the owners guide I was able to disassemble the unit and inspect/clean the intake and fuel supply orifice for any foreign items. Didn't find anything. With the outer box off I rehooked the unit to the gas supply and fired it up so I could watch it operate. You talk about a hot blast of air in your face!! I put everything back in and decided if it continues to act up this weekend I will run it back to Thunder RV(the selling dealer) for them to figure out as I have gone as far as I can myself. Thanks for the input from everyone, if it acts up and they figure it out I will post the answer.
     
  10. lookn-ahead

    lookn-ahead New Member

    Furnace exchaust makes thundering like noise

    Friend has a Thor with the same problem. Sounded like a rumbling jet engine. I was able to stop it by cutting down on the amount of air at the mixture tube. There is a small screw and allows the pipe to be adjusted. Use the smallest amount of adjustment that quiets the problem.
     

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