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Lochinvar NKC 199N
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stevetheplumber
Member Posts: 4
in Gas Heating
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?
Thanks
Thanks
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Merry Christmas Steve!
D0
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