66a series

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noor288
noor288 Posts: 2
in Gas Heating

I have a boiler hot water system 66 a I have no heat the c wire is The one goes from from transformer to the

IMG_7857.jpeg

and there’s no power coming from transformer what do I do?

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  • noor288
    noor288 Posts: 2

    the wire is burnt I will be replacing the wire, but there’s no power coming from the transformer.

  • 109A_5
    109A_5 Posts: 4,759

    I can't see anything burnt. Better information and pictures may get you better help.

    It looks like the transformer just reduces a 120 VAC control system to 24 VAC to only power the gas valve (no 24 VAC control). Is there power going to the boiler ? Just a guess, Red arrow 120 VAC power input, Orange arrows 120 VAC control. The absence of either functioning properly could disable the transformer, also the transformer could be defective.

    image.png
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

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