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Honeywell L7224/L7248

rpagano Member Posts: 1
Replaced boiler control yesterday. The boiler is not firing. The control is throwing code STA 8. The TT is not staying green. 


  • 109A_5
    109A_5 Member Posts: 1,342
    Hello @rpagano,
    Where does the TT come from ? Thermostat, or other equipment ?

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
    HVACNUT Member Posts: 5,748
    Try jumping TT.
    Could be the thermostat or wiring to TT.