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    izslash's Avatar
    izslash Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Aug 30, 2009, 12:05 PM
    Furnace starts up with thermostat off
    I have a Goodman furnace about 15 yrs old. Problem is it starts up by itself with the thermostat off. I replaced the thermostat but it still does the same thing.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Aug 30, 2009, 05:53 PM
    Sounds like you have a short circuit in the low voltage wiring from the thermostat to the unit.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #3

    Aug 30, 2009, 06:34 PM
    Is it gas or electric furnace?

    If its electric after you`ve check the low voltage wiring for short,, it just might be the sequenser
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Aug 30, 2009, 09:05 PM
    They never give us enough information and my crystal ball is still broken waiting for parts.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #5

    Aug 30, 2009, 09:06 PM

    Are we talking fan or heat and fan?
    izslash's Avatar
    izslash Posts: 2, Reputation: 1
    New Member
    		  
    #6

    Aug 31, 2009, 02:20 PM
    We are talking heat and fan with the thermostat set to the lowest setting. I also completely removed the thermostat and kept the wires separated, but when I switched on the emergency switch the heater started up. (I turned off the emergency switch so it doesn't start up) It is Goodman a gas furnace.
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