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    candolandsc's Avatar
    candolandsc Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Mar 10, 2012, 12:02 PM
    Gas furnace
    Exhaust fan comes on for two seconds and goes off. Control board light is steady no blinks
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    Mar 10, 2012, 06:32 PM
    If you don't have a fault code on the control board when it shuts down.I would say the control board is bad. You can try jumping the wires R to W at the thermostat to make sure you don't have a bad thermostat or heat anticipator. If it works the thermostat is bad.
    candolandsc's Avatar
    candolandsc Posts: 4, Reputation: 1
    New Member
    		  
    #3

    Mar 10, 2012, 07:19 PM
    Thanks. I took off hose to pressure switch. Not clogged. Reinstalled. Furnace working. Could thermostat or pressure switch work intermittently?
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