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ZC terminal

jackmc Member Posts: 1
8124 aquastatt wired to R832a , ZC to 1 , ZR to 4 , 3 to circ , for 2 nd zone , Burham V83 with tankless coil , c1 drops out at correct temp 150 degrees from Low set at 160 , but ZC stays powered therefore 2 nd zone Circe keeps running when need heat for tankless , is this a bad 8124 ?


  • Big Ed_4
    Big Ed_4 Member Posts: 2,805
    ZC should drop out on the low ...

    There was an error rendering this rich post.

  • SeymourCates
    SeymourCates Member Posts: 162

    If C1 properly drops out (with the 'stat closed), and ZC remains powered, the only possibility is a bad L8124.