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Thread: Humming coming from inside boiler

  1. #1
    DIY Junior Member tombstone's Avatar
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    Default Humming coming from inside boiler

    Good Morning!

    I am hearing a faint humming coming from inside my boiler and am trying to troubleshoot it. This is what I've discovered thus far.

    1) If I turn power off to the boiler the humming stops.
    2) If I turn the thermostat off but keep the power on the humming continues.

    This very well may be a normal condition, but I had the boiler enclosed on three sides and may not have heard it before. I tore down one of the walls to access some piping before I fired it up. Yesterday we piped in a sprivent and bladder style expansion tank as well.

    I'm not overly intimately familiar with everything concerning this boiler and am looking for things I should check.

    Thanks in advance for any and all help.

  2. #2
    In the Trades Tom Sawyer's Avatar
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    Its probably an transformer or relay.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Many transformers make a hum at the line frequency rate (or double it) of 60Hz.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    DIY Junior Member tombstone's Avatar
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    Sounds good! I look at the manual are there is an internal transformer.

    Thanks again!

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