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    roadrunner3's Avatar
    roadrunner3 Posts: 3, Reputation: 1
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    #1

    Mar 5, 2007, 05:03 AM
    Heil Furnace
    I have A Heil Furnace that starts up just fine Model #NDG1075DFo1, but after its running for 5 minutes or so it gets another call for heat, fills the gas box with naatural gas and re-lights this mix pretty violently. This may happen a few times during the heating cycle until the thermostat is satisfied and shuts the unit down. There is nothing wrong with the thermostat as I have jumpered it out to eliminate it as a cause. Is it the valve or the control board. Any help would be greatly appreaciated as it feels like it is going to blow up one of these days
    .
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #2

    Mar 5, 2007, 03:52 PM
    Part one of the problem I think is the furnace is over heating and limmiting out. As far as the delayed combustion you are experiencing, I need to know more about what type of ignition it has, i.e.. Standing pilot, auto pilot, direct spark hot surface ignition I don't know enough about that model number.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #3

    Mar 5, 2007, 03:53 PM
    Oh, did you read the FAQ sticky at top of main HVAC page for more answers?
    jake4's Avatar
    jake4 Posts: 29, Reputation: 1
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    #4

    Mar 5, 2007, 07:59 PM
    What's the serial # on this 80%eff 75,000 BTU furnace
    roadrunner3's Avatar
    roadrunner3 Posts: 3, Reputation: 1
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    #5

    Mar 6, 2007, 06:56 AM
    Quote Originally Posted by NorthernHeat
    Part one of the problem I think is the furnace is over heating and limmiting out. As far as the delayed combustion you are experiencing, I need to know more about what type of ignition it has, ie. standing pilot, auto pilot, direct spark hot surface ignition I don't know enough about that model number.

    This furnace has direct spark hot surface ignition. The furnace is cutting out and relighting I think because the flame sensor may not be seeing the flame on the burner or the pressure switch may be bad . Does any of this make any sense? Thanks for the Help.
    jake4's Avatar
    jake4 Posts: 29, Reputation: 1
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    #6

    Mar 6, 2007, 09:24 AM
    I have seen on two units this winter, same model, where your pressure switch hose connects to draft inducer housing, restricted. Pull hose off and run paper clip in port a couple of times, and reconnect hose, the port sometimes gets a little rust build up.
    roadrunner3's Avatar
    roadrunner3 Posts: 3, Reputation: 1
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    #7

    Mar 7, 2007, 06:47 AM
    Heil Furnace
    Does anybodt out there know where the pressure switch is on a Hiel Furnace . It is a downdraft model with direct spark hot surface ignition Model # NDG1075DF01.Thanks in advance
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #8

    Mar 7, 2007, 07:37 AM
    I can't say exactly, but there should be a small hose coming out to a round flat thing between the heat exchanger and the inducer blower.
    RudyDRuybal's Avatar
    RudyDRuybal Posts: 1, Reputation: 1
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    #9

    Jan 21, 2009, 05:44 PM

    What is the proper way to direct the condensation tubes to prevent water leaking?
    scobbydo's Avatar
    scobbydo Posts: 2, Reputation: 1
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    #10

    Jan 21, 2011, 10:24 AM
    I,am still waiting for an answer??
    lpjohnson's Avatar
    lpjohnson Posts: 1, Reputation: 1
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    #11

    Oct 18, 2012, 02:40 PM
    I have a 2005 Heil Furnace H9MPD075F12B1 The inducer has been replaced 2-3times. The code is 6 flashes + 1 flash = soft lockout. I replaced the inducer again just because the service guy said the bearing was starting to go-loud whining noise. This time that did not do the trick. The same code still appears.Lance I am going to try cleaning flame sensor rod
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