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    cmitic's Avatar
    cmitic Posts: 1, Reputation: 1
    New Member
     
    #1

    Dec 2, 2007, 06:54 PM
    Installed new Noma thermostat 52-2570-6 heat stays on
    I bought this Noma thermostat and the heat stays on, no matter what. Even if I detach the front plate the heat remains on. When I reinstall the old mercury swtiched thermostat it works fine. I have a 2 wire hydronic heat system. Can anyone tell me why the heat stays on?

    Any advise will help. Thanks so much.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Dec 3, 2007, 05:05 AM
    Your new thermostat is probably not compatible with a two wire system. You might have to pull a 3rd wire for proper operation.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
     
    #3

    Dec 3, 2007, 05:17 AM
    It could be a bad thermostat. Before our H&C expert, Northern Heat , went AWOL, he used to suggest NOMA's were junk.

    If it powers up on 2 wires, it should work.

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