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Thread: Humming Sound from Boiler Electrical Component

  1. #1
    DIY Junior Member GregoryR's Avatar
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    Default Humming Sound from Boiler Electrical Component

    Hello,

    As far as I can remember, this piece has been the cause of a humming noise. Any ideas on what this does and if I could easily replace it?

    Thanks!

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  2. #2
    Plumber jimbo's Avatar
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    It is the transformer for the low voltage controls. Need to find the specs, might be printed on the other side somewhere. Most likely, it is 24 VAC output rated 40 volt/amps. Any electric supply or heating supplier will have it. Do not subsitute a "doorbell " transformer from the hardware store.

  3. #3
    Electrician ActionDave's Avatar
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    All transformers make that humming noise. A new one is not guaranteed to be any quieter.

  4. #4
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by ActionDave View Post
    All transformers make that humming noise. A new one is not guaranteed to be any quieter.
    Especial when mounted on a plate like that.

    Normal operation for the way it is installed, I think.
    Theory only works perfect in a vacuum.

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