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Combi boiler Noise?

HTP combi boiler making loud humming noise, video provided, the noise I'm referring to starts at 0:02 till 0:04. This humming noise will come and go when the unit is running. Can be very loud at times, will make this noise for usually a few seconds then stop and can do this repeatedly 5 or 6 times in a row. This noise isn't supposed to happen is it? Heard it could be something to do with the gas valve. Anyway any info on what's wrong or how to fix would be appreciated. Thanks.



  • Big Ed_4
    Big Ed_4 Member Posts: 2,805
    Propane or Natural Gas ? What is the incoming gas pressure at static and when unit is running at high fire ? First two questions

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  • fenkel
    fenkel Member Posts: 162
    How old is your boiler???
     Is the unit a uft model?
    Check the htp website...i think they have a video on this issue.
    I couldnt open the video... 
  • Intplm.
    Intplm. Member Posts: 1,997
    Your gas main, if undersized, will cause a humming noise.
    Check your BTU ratings to pipe size requirements.