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Lochinvar NKC 199N

Having an issue with the boiler rumbling in low fire mode, around 20% burner firing rate. I cleaned the burner, condensate trap and the domestic water inlet screen. Unit is 3 years old . Checking gas pressures today. Any thoughts?


  • DZoro
    DZoro Member Posts: 1,048
    Combustion test set up, high fire, and then low fire, while monitoring your gas pressures. If you don't have the low fire #'s call Lochinvar and they will walk you through it.
    Ironmandelta Tstevetheplumber
  • stevetheplumber
    stevetheplumber Member Posts: 4
    Thanks I got the rumbling taken care of.
    Gas valve adjustment and combustion test.

    Merry Christmas
  • DZoro
    DZoro Member Posts: 1,048
    Merry Christmas Steve!