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Ncb 240 turning on randomly

pedro268 Member Posts: 1
I have a ncb 240 I have changed the thermostat twice. It will work normal for a few days and then it will turn on and call for heat. The thermostat is in the off position. I double checked the wiring. Nothing is touching or broken.


  • Jamie Hall
    Jamie Hall Member Posts: 21,514
    You'll need to find out what command or device is asking it to run. A keep warm aquastat somehere?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England