Humming coming from inside boiler

Discussion in 'Boiler Forum' started by tombstone, Oct 21, 2013.

  1. tombstone

    tombstone New Member

    Feb 11, 2008
    New York
    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. Tom Sawyer

    Tom Sawyer In the Trades

    Nov 29, 2010
    Its probably an transformer or relay.
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Many transformers make a hum at the line frequency rate (or double it) of 60Hz.
  5. tombstone

    tombstone New Member

    Feb 11, 2008
    New York
    Sounds good! I look at the manual are there is an internal transformer.

    Thanks again!
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