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    N-BY-NW's Avatar
    N-BY-NW Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 26, 2009, 12:16 PM
    Carrier furnace runs 1 stage of 2 stages for 3 hours
    Carrier model 58mta 9300TS: The furnace will run sometimes it seems like forever without shutting down.. Furnace was installed 03/2004 it just started acting this way lately I have installed a new digital 2 stage thermostat just last week it still acting up... does not want come out of 1st stage of heat anywhere from 45mins. To 4 hours... Any thoughts anybody . Thanks N-BY-NW
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 26, 2009, 03:20 PM
    Check to see if there are any codes being posted by the circuit board. Usually if there is a problem codes will be shown in the number of blinks of the lite on the board. Also after you get the number of blinks there is a legend on the back of the blower door that will tell you what they mean. Post the number of blinks and the legend statement.

    Your owners manual is here

    http://67.52.177.135/Images/upload/p...urnace/om1.pdf
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #3

    Jan 26, 2009, 03:24 PM
    The furnace should be equipped with a diagnostic LED that will blink/flash if a malfunction occurs. If it is a variable-speed unit, the circuit board will store faults in memory for later retrieval. The service label on the unit (usually found inside the front panel) should give a description of various faults and there respective remedies, as well as a description of the procedure for retrieving stored faults if you have a variable-speed unit. What you describe sound like the higher stage isn't working or isn't being activated.
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