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

    Oct 20, 2011, 05:31 PM
    Flash code 3
    Installed cnt 03797 board now I get code 3 pressure switch problem instructions call for disconnect pressure wires what could be problem bad board
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    T-Top Posts: 1,871, Reputation: 100
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    #2

    Oct 20, 2011, 07:22 PM
    Restricted vent or vent motor not working. Vent pressure switch stuck open or closed.
    popisr's Avatar
    popisr Posts: 2, Reputation: 1
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    #3

    Oct 21, 2011, 08:11 AM
    Vent motor is working pressure switch is not needed with new cnt 03797 control instruction called for pressure switch be disconnected
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    T-Top Posts: 1,871, Reputation: 100
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    #4

    Oct 21, 2011, 03:09 PM
    I can kind of see what your saying. Not knowing make and model of the furnace only slows our process. If your system is inducer draft(vent motor) It will have a pressure switch, vacuum switch or centrifugal switch. One of the above will have to close a circuit to prove the motor is running and the vent is clear for it to light.
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