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    richwho's Avatar
    richwho Posts: 3, Reputation: 1
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    #1

    Mar 10, 2008, 06:24 PM
    Day & Night Gas heat INOP
    I have a Day & night model 588, the ignition circuit board LED indicates a fault #8 (internal control fault). Are there voltage checks to confirm that the circuit board needs replacement.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Mar 10, 2008, 06:28 PM
    Looks like circuit board.

    8 Flashes Internal Control Fault •

    You might check all the grounds from the furnace back to the main electric panel.
    richwho's Avatar
    richwho Posts: 3, Reputation: 1
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    #3

    Mar 10, 2008, 06:47 PM
    Quote Originally Posted by hvac1000
    Looks like circuit board.

    8 Flashes Internal Control Fault •

    You might check all the grounds from the furnace back to the main electric panel.

    Thanks! I will check the ground connections. If this does not work I will need a replacement circuit board. Do you know what the replacement circuit board is for the original 48SS500177 board.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Mar 10, 2008, 07:35 PM
    I find no listing for that part number.

    Example of numbers below

    http://heatcoolparts.com/webpages/Ca...nControls.html
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