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    briankshepherd's Avatar
    briankshepherd Posts: 2, Reputation: 1
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    #1

    Jan 23, 2010, 11:27 PM
    Noma thm303m thermostat, furnace will not turn off
    I have a Noma THM303M thermostat which I hooked up yesterday. I only had 2 wires and the manual states they can be reversed. The thermostat worked perfect yesterday, now today the furnace turns on and stays on.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 24, 2010, 02:59 AM
    Check for shorted thermostat wires. This will cause the furnace to run all the time.
    briankshepherd's Avatar
    briankshepherd Posts: 2, Reputation: 1
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    #3

    Jan 24, 2010, 09:31 AM

    The 2 additional wires are securely taped. The override on the unit does not work, but when the turn the switch from heat to off. The furnace will turn off. Effectively I now have a manual furnace.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Jan 24, 2010, 09:54 AM
    Quote Originally Posted by briankshepherd View Post
    I have a Noma THM303M thermostat which I hooked up yesterday. I only had 2 wires and the manual states they can be reversed. The thermostat worked perfect yesterday, now today the furnace turns on and stays on.

    The 2 additional wires are securely taped.

    What 2 additional wires? You never mentioned this in your first post
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