Coleman Gas Furnace - Not working :(

Discussion in 'Home Repair' started by glitter_sno@yahoo.com, Dec 4, 2011.

  1. Guest

    Hello all! I have a Coleman Gas Furnace that is not working. For a
    while the problem was intermittent, but now it completely quit. The
    thermostat is working properly, sending the furnace the signal to
    heat. The sensors and the igniter are working. The igniter glows and
    is ready for the gas valve to open. You hear a click in the control
    module and the gas valve does not turn on and the igniter shuts down.
    We are torn between the control module and the gas valve being
    defective. Any help would be very appreciated.
     
    , Dec 4, 2011
    #1
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  2. Guest

    On Dec 4, 10:31 am, wrote:
    > Hello all! I have a Coleman Gas Furnace that is not working. For a
    > while the problem was intermittent, but now it completely quit. The
    > thermostat is working properly, sending the furnace the signal to
    > heat. The sensors and the igniter are working. The igniter glows and
    > is ready for the gas valve to open. You hear a click in the control
    > module and the gas valve does not turn on and the igniter shuts down.
    > We are torn between the control module and the gas valve being
    > defective. Any help would be very appreciated.


    Put a VOM on the wires going to the gas valve. If it gets voltage
    when it's supposed to open, then it's the valve. No voltage, then
    it's something else, most likely the controller. I'd also measure
    the voltage with the wires disconnected, because if the valve
    solenoid is shorted you could read zero or low voltage due to
    the short. Voltage is usually 24V.
     
    , Dec 4, 2011
    #2
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  3. Ken Guest

    wrote:
    > On Dec 4, 10:31 am, wrote:
    >> Hello all! I have a Coleman Gas Furnace that is not working. For a
    >> while the problem was intermittent, but now it completely quit. The
    >> thermostat is working properly, sending the furnace the signal to
    >> heat. The sensors and the igniter are working. The igniter glows and
    >> is ready for the gas valve to open. You hear a click in the control
    >> module and the gas valve does not turn on and the igniter shuts down.
    >> We are torn between the control module and the gas valve being
    >> defective. Any help would be very appreciated.

    >
    > Put a VOM on the wires going to the gas valve. If it gets voltage
    > when it's supposed to open, then it's the valve. No voltage, then
    > it's something else, most likely the controller. I'd also measure
    > the voltage with the wires disconnected, because if the valve
    > solenoid is shorted you could read zero or low voltage due to
    > the short. Voltage is usually 24V.


    I agree with your answer, but I would add that it is not uncommon for
    the coil on the gas valve to open up. He could put an ohm meter on the
    coil connection with one wire removed to check the coil. I have had at
    least two valves that had open coils.
     
    Ken, Dec 4, 2011
    #3
  4. Tony Hwang Guest

    wrote:
    > Hello all! I have a Coleman Gas Furnace that is not working. For a
    > while the problem was intermittent, but now it completely quit. The
    > thermostat is working properly, sending the furnace the signal to
    > heat. The sensors and the igniter are working. The igniter glows and
    > is ready for the gas valve to open. You hear a click in the control
    > module and the gas valve does not turn on and the igniter shuts down.
    > We are torn between the control module and the gas valve being
    > defective. Any help would be very appreciated.

    Hi,
    No trouble code? Or valve coil is shot or no voltage to it when it
    supposes to,
     
    Tony Hwang, Dec 4, 2011
    #4
  5. Guest

    On Sun, 4 Dec 2011 07:31:44 -0800 (PST), wrote:

    >Hello all! I have a Coleman Gas Furnace that is not working. For a
    >while the problem was intermittent, but now it completely quit. The
    >thermostat is working properly, sending the furnace the signal to
    >heat. The sensors and the igniter are working. The igniter glows and
    >is ready for the gas valve to open. You hear a click in the control
    >module and the gas valve does not turn on and the igniter shuts down.
    >We are torn between the control module and the gas valve being
    >defective. Any help would be very appreciated.

    I'd be very suspicious of a plugged inlet screen in the gas valve,
    but it should be relatively easy to determine if power is being
    delivered to the gas valve by the control board.
     
    , Dec 4, 2011
    #5
  6. Guest

    On Sun, 4 Dec 2011 09:08:28 -0800 (PST), ""
    <> wrote:

    >On Dec 4, 10:31 am, wrote:
    >> Hello all! I have a Coleman Gas Furnace that is not working. For a
    >> while the problem was intermittent, but now it completely quit. The
    >> thermostat is working properly, sending the furnace the signal to
    >> heat. The sensors and the igniter are working. The igniter glows and
    >> is ready for the gas valve to open. You hear a click in the control
    >> module and the gas valve does not turn on and the igniter shuts down.
    >> We are torn between the control module and the gas valve being
    >> defective. Any help would be very appreciated.

    >
    >Put a VOM on the wires going to the gas valve. If it gets voltage
    >when it's supposed to open, then it's the valve. No voltage, then
    >it's something else, most likely the controller. I'd also measure
    >the voltage with the wires disconnected, because if the valve
    >solenoid is shorted you could read zero or low voltage due to
    >the short. Voltage is usually 24V.

    I would do the opposite - I'd test it with the valve connected,
    because a high resistance connection would still show full voltage
    when disconnected - and would show low or no voltage when connected. A
    shorted solenoid is a much less likely situation - and can easily be
    tested for with an ohm-meter.
     
    , Dec 4, 2011
    #6
  7. On 12/4/2011 9:31 AM, wrote:
    > Hello all! I have a Coleman Gas Furnace that is not working. For a
    > while the problem was intermittent, but now it completely quit. The
    > thermostat is working properly, sending the furnace the signal to
    > heat. The sensors and the igniter are working. The igniter glows and
    > is ready for the gas valve to open. You hear a click in the control
    > module and the gas valve does not turn on and the igniter shuts down.
    > We are torn between the control module and the gas valve being
    > defective. Any help would be very appreciated.


    Would you happen to have the model number of your furnace? I may be able
    to look up the wiring diagram or service manual online. If your
    furnace is a later model, the problem could be something as simple as
    a Klixon temperature sensor with a manual reset button. I found a good
    example picture showing what a manual reset safety sensor looks like
    and you'll notice the reset button between the Faston terminals. The
    one you have may have a smaller black button and there may be several
    mounted in different places inside the burner cover.

    http://www.mobilehomerepair.com/media/img/nordyne/626343.jpg

    TDD
     
    The Daring Dufas, Dec 4, 2011
    #7
  8. Guest

    On Dec 4, 2:24 pm, The Daring Dufas <>
    wrote:
    > On 12/4/2011 9:31 AM, wrote:
    >
    > > Hello all! I have a Coleman Gas Furnace that is not working. For a
    > > while the problem was intermittent, but now it completely quit. The
    > > thermostat is working properly, sending the furnace the signal to
    > > heat. The sensors and the igniter are working. The igniter glows and
    > > is ready for the gas valve to open. You hear a click in the control
    > > module and the gas valve does not turn on and the igniter shuts down.
    > > We are torn between the control module and the gas valve being
    > > defective. Any help would be very appreciated.

    >
    > Would you happen to have the model number of your furnace? I may be able
    > to look up the wiring diagram or service manual online. If your
    > furnace is a later model, the problem could be something as simple as
    > a Klixon temperature sensor with a manual reset button. I found a good
    > example picture showing what a manual reset safety sensor looks like
    > and you'll notice the reset button between the Faston terminals. The
    > one you have may have a smaller black button and there may be several
    > mounted in different places inside the burner cover.
    >
    > http://www.mobilehomerepair.com/media/img/nordyne/626343.jpg
    >
    > TDD


    The model number is: 7970-656/D One thing my husband did do, he
    hooked up a power supply to the gas valve while it was going through
    the cycle and it opened to allow gas into the burning chamber. The
    meter says it is getting voltage, so I am rather confused. Thank you
    all for trying to help, you have no idea how much I appreciate it.
     
    , Dec 4, 2011
    #8
  9. Guest

    On Dec 4, 6:15 pm, wrote:
    > On Dec 4, 2:24 pm, The Daring Dufas <>
    > wrote:
    >
    >
    >
    >
    >
    > > On 12/4/2011 9:31 AM, wrote:

    >
    > > > Hello all! I have a Coleman Gas Furnace that is not working. For a
    > > > while the problem was intermittent, but now it completely quit. The
    > > > thermostat is working properly, sending the furnace the signal to
    > > > heat. The sensors and the igniter are working. The igniter glows and
    > > > is ready for the gas valve to open. You hear a click in the control
    > > > module and the gas valve does not turn on and the igniter shuts down.
    > > > We are torn between the control module and the gas valve being
    > > > defective. Any help would be very appreciated.

    >
    > > Would you happen to have the model number of your furnace? I may be able
    > > to look up the wiring diagram or service manual online. If your
    > > furnace is a later model, the problem could be something as simple as
    > > a Klixon temperature sensor with a manual reset button. I found a good
    > > example picture showing what a manual reset safety sensor looks like
    > > and you'll notice the reset button between the Faston terminals. The
    > > one you have may have a smaller black button and there may be several
    > > mounted in different places inside the burner cover.

    >
    > >http://www.mobilehomerepair.com/media/img/nordyne/626343.jpg

    >
    > > TDD

    >
    > The model number is: 7970-656/D  One thing my husband did do, he
    > hooked up a power supply to the gas valve while it was going through
    > the cycle and it opened to allow gas into the burning chamber. The
    > meter says it is getting voltage, so I am rather confused. Thank you
    > all for trying to help, you have no idea how much I appreciate it.- Hide quoted text -
    >
    > - Show quoted text -


    Maybe the volts from the power supply spin clockwise
    while the volts from the control board spin counter-clockwise?
    Could be the valve was made for Australia.
     
    , Dec 5, 2011
    #9
  10. Guest

    On Sun, 4 Dec 2011 15:15:24 -0800 (PST), wrote:

    >On Dec 4, 2:24 pm, The Daring Dufas <>
    >wrote:
    >> On 12/4/2011 9:31 AM, wrote:
    >>
    >> > Hello all! I have a Coleman Gas Furnace that is not working. For a
    >> > while the problem was intermittent, but now it completely quit. The
    >> > thermostat is working properly, sending the furnace the signal to
    >> > heat. The sensors and the igniter are working. The igniter glows and
    >> > is ready for the gas valve to open. You hear a click in the control
    >> > module and the gas valve does not turn on and the igniter shuts down.
    >> > We are torn between the control module and the gas valve being
    >> > defective. Any help would be very appreciated.

    >>
    >> Would you happen to have the model number of your furnace? I may be able
    >> to look up the wiring diagram or service manual online. If your
    >> furnace is a later model, the problem could be something as simple as
    >> a Klixon temperature sensor with a manual reset button. I found a good
    >> example picture showing what a manual reset safety sensor looks like
    >> and you'll notice the reset button between the Faston terminals. The
    >> one you have may have a smaller black button and there may be several
    >> mounted in different places inside the burner cover.
    >>
    >> http://www.mobilehomerepair.com/media/img/nordyne/626343.jpg
    >>
    >> TDD

    >
    >The model number is: 7970-656/D One thing my husband did do, he
    >hooked up a power supply to the gas valve while it was going through
    >the cycle and it opened to allow gas into the burning chamber. The
    >meter says it is getting voltage, so I am rather confused. Thank you
    >all for trying to help, you have no idea how much I appreciate it.

    Was it connected when you checked the voltage? Like I said in a
    previous post - a high resistance connection in the control circuit
    will show full voltage when open circuit, and low or no voltage when
    connected to the load (solenoid coil).I'm suspicious you have a cold
    solder joint somewhere on the control board
     
    , Dec 5, 2011
    #10
  11. Guest

    On Dec 4, 7:42 pm, wrote:
    > On Sun, 4 Dec 2011 15:15:24 -0800 (PST), wrote:
    > >On Dec 4, 2:24 pm, The Daring Dufas <>
    > >wrote:
    > >> On 12/4/2011 9:31 AM, wrote:

    >
    > >> > Hello all! I have a Coleman Gas Furnace that is not working. For a
    > >> > while the problem was intermittent, but now it completely quit. The
    > >> > thermostat is working properly, sending the furnace the signal to
    > >> > heat. The sensors and the igniter are working. The igniter glows and
    > >> > is ready for the gas valve to open. You hear a click in the control
    > >> > module and the gas valve does not turn on and the igniter shuts down..
    > >> > We are torn between the control module and the gas valve being
    > >> > defective. Any help would be very appreciated.

    >
    > >> Would you happen to have the model number of your furnace? I may be able
    > >> to look up the wiring diagram or service manual online. If your
    > >> furnace is a later model, the problem could be something as simple as
    > >> a Klixon temperature sensor with a manual reset button. I found a good
    > >> example picture showing what a manual reset safety sensor looks like
    > >> and you'll notice the reset button between the Faston terminals. The
    > >> one you have may have a smaller black button and there may be several
    > >> mounted in different places inside the burner cover.

    >
    > >>http://www.mobilehomerepair.com/media/img/nordyne/626343.jpg

    >
    > >> TDD

    >
    > >The model number is: 7970-656/D  One thing my husband did do, he
    > >hooked up a power supply to the gas valve while it was going through
    > >the cycle and it opened to allow gas into the burning chamber. The
    > >meter says it is getting voltage, so I am rather confused. Thank you
    > >all for trying to help, you have no idea how much I appreciate it.

    >
    >  Was it connected when you checked the voltage? Like I said in a
    > previous post - a high resistance connection in the control circuit
    > will show full voltage when open circuit, and low or no voltage when
    > connected to the load (solenoid coil).I'm suspicious you have a cold
    > solder joint somewhere on the control board


    Thank you all SO much for your input. After doing a lot of
    troubleshooting, reading what everyone had to say, and reading on
    other sites, we went ahead and replaced the control module and it is
    working beautifully :)
     
    , Dec 6, 2011
    #11
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