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    mrhrdwr's Avatar
    mrhrdwr Posts: 6, Reputation: 1
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    #1

    Nov 9, 2008, 09:27 AM
    Coleman Furnace: Burner will not come on.
    I have the pilot on, electrical on, the fan works, the filters are clean, the thermostat is working properly, yet the burner will not ignite. The furnace worked just fine last night.:confused:
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #2

    Nov 9, 2008, 12:41 PM
    Exact model number of furnace?
    mrhrdwr's Avatar
    mrhrdwr Posts: 6, Reputation: 1
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    #3

    Nov 9, 2008, 01:07 PM

    7970c856 coleman direct vent forced air furnace
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Nov 9, 2008, 04:29 PM
    Sounds like a mobile home unit

    Is the HEAT-on-A/C switch set to heat? The switch is located on the box in front of the blower
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    mrhrdwr Posts: 6, Reputation: 1
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    #5

    Nov 9, 2008, 04:43 PM
    Quote Originally Posted by hvac1000 View Post
    Sounds like a mobile home unit

    Is the HEAT-on-A/C switch set to heat? The switch is located on the box in front of the blower
    Yes, I have tried it both ways. No response.
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    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Nov 9, 2008, 06:30 PM
    Check to see if you are getting 24 volts to the gas valve when the unit is supposed to be in heat mode.
    retired20959's Avatar
    retired20959 Posts: 14, Reputation: 1
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    #7

    Nov 9, 2008, 08:36 PM
    Did you check the wiring on the board? Also check wiring at the pilot
    mrhrdwr's Avatar
    mrhrdwr Posts: 6, Reputation: 1
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    #8

    Nov 9, 2008, 08:41 PM

    Everything looks normal. I am not an HVAC person or electrician. I installed this unit 4 years ago and it has always worked well. The wiring looks fine.
    Ferghus's Avatar
    Ferghus Posts: 97, Reputation: -4
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    #9

    Nov 9, 2008, 08:41 PM
    Quote Originally Posted by mrhrdwr View Post
    I have the pilot on, electrical on, the fan works, the filters are clean, the thermostat is working properly, yet the burner will not ignite. the furnace worked just fine last night.:confused:
    I've got to ask a dumb question here. Do you actually have gas? You say Coleman furnace, and I'm thinking... for a motorhome? Is it a propane furnace? If so, go out to your tank and open the hood at the top and look at the gauge to see what percentage of gas is in the tank.
    retired20959's Avatar
    retired20959 Posts: 14, Reputation: 1
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    #10

    Nov 9, 2008, 08:47 PM

    IS this unit installed in a house? You stated that it is a Coleman furnace,is this a two stage furnace?
    mrhrdwr's Avatar
    mrhrdwr Posts: 6, Reputation: 1
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    #11

    Nov 9, 2008, 08:50 PM
    Quote Originally Posted by Ferghus View Post
    I've gotta ask a dumb question here. Do you actually have gas? You say Coleman furnace, and I'm thinking... for a motorhome? Is it a propane furnace? If so, go out to your tank and open the hood at the top and look at the gauge to see what percentage of gas is in the tank.
    This is a mobile home. I have natural gas and the pilot is working properly. The gas valve is on. This morning I turned off the gas and electricity to the unit and let it stand for a while then I relit the pilot and turned on the electric. Nothing changed. The polit is on and the burner will not ignite. The furnace clicks wheni turn up the thermostat as it normally does. But the burner never comes on.
    retired20959's Avatar
    retired20959 Posts: 14, Reputation: 1
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    #12

    Nov 9, 2008, 08:55 PM

    You need a new gas valve.you also have a Coleman Evcon Furnace which is a two stage furnace.When you replace the gas valve also install a new pilot assembly.The parts are still under warrentty
    mrhrdwr's Avatar
    mrhrdwr Posts: 6, Reputation: 1
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    #13

    Nov 9, 2008, 08:56 PM

    This is a mobile home. And I am not sure about the two stage or not.
    retired20959's Avatar
    retired20959 Posts: 14, Reputation: 1
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    #14

    Nov 9, 2008, 09:05 PM
    Quote Originally Posted by mrhrdwr View Post
    This is a mobile home. And i am not sure about the two stage or not.
    Coleman furnaces have trouble with the gas valves and also the pilot assembly.These parts are under warrentty
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