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FOU error code on HTP boiler.

slession Member Posts: 1

March 25 in Gas Heating

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

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Comments

109A_5 Member Posts: 2,277

March 25

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

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