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

    Oct 8, 2008, 04:20 PM
    Intertherm furnace won't shut off
    I have an Intertherm furnace and a/c unit.The problem is neither will shut off unless physically turned off at furnace.Theres also an heat,off,a/c switch on thermostat and I hear a relay clicking in furnace when I move this switch back and forth on the thermostat but to no avail, the furnace stays on or the a/c stays on when switched to that mode on furnace.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 8, 2008, 11:18 PM
    Does the furnace heat or the A/C outside unit keep running or is it just the inside blower that keeps running?
    jackkim's Avatar
    jackkim Posts: 2, Reputation: 1
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    #3

    Oct 9, 2008, 05:45 PM
    Yes the furnace blows hot and the a/c blows cold continually.I even disconnected the tremostat and they run nonstop
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Oct 9, 2008, 06:41 PM
    You have a problem with the low voltage side of the system more than likely. It could be a short in the thermostat wiring in a wall or in the furnace. I would sound out those wires first then move on to the rest of the 24 volt components like relays etc.

    If your unit has a A/C/OFF/FURNACE switch in the furnace like some mobile homes have the problem could be a shorted switch or the relays it controls.
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