FOU error code on HTP boiler.

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slession
slession Posts: 1
in Gas Heating

This is the outdoor sensor error but I have no outdoor sensor on my system. Please help.

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  • 109A_5
    109A_5 Posts: 4,759

    If you have not yet checked this, maybe it will help (read the NOTE).

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

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