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    merlin73's Avatar
    merlin73 Posts: 4, Reputation: 1
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    #1

    Oct 18, 2011, 05:13 PM
    Goodman furnace with 3 blinking lights and furnace has flame roll back
    I have a GMNT-080-4B Some times I get a 3 blink light issue and then when it starts it has a flame roll back. Also I have to change the ignitor every year. Any help would be great
    JonesHVAC's Avatar
    JonesHVAC Posts: 173, Reputation: 12
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    #2

    Oct 18, 2011, 08:01 PM
    Flame rollback can be from a various number of issues all being dangerous. Best advice would be to call a qualified technician so he can check gas output levels from the valve, heat exchanger, etc.
    merlin73's Avatar
    merlin73 Posts: 4, Reputation: 1
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    #3

    Oct 18, 2011, 08:21 PM
    I just checked my install manual online, whould a under size vent pipe cause the flame roll back, the installer put a 2" and should be 3"
    JonesHVAC's Avatar
    JonesHVAC Posts: 173, Reputation: 12
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    #4

    Oct 18, 2011, 08:50 PM
    Is it 2" all the way to the outside or does it go from 2" and then transision into 3"?
    merlin73's Avatar
    merlin73 Posts: 4, Reputation: 1
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    #5

    Oct 18, 2011, 10:00 PM
    It is 2" all the way to the roof, I went to the roof to see if it was clogged and saw that the venting pipes was 2"
    JonesHVAC's Avatar
    JonesHVAC Posts: 173, Reputation: 12
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    #6

    Oct 19, 2011, 08:11 AM
    Well then yes that is incorrect. The vent size standard off that furnace is 3"... sometimes a tech will downsize at the furnace for approximately 3 or 4 feet and then go back to 3". Being that it was installed with 2" it causes a retriction for proper combustion flow. That unit is designed to flow with a 3" pipe and therefor should be installed as such. I would call them back and tell them to fix their screw up. Are they paid in full?
    merlin73's Avatar
    merlin73 Posts: 4, Reputation: 1
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    #7

    Oct 19, 2011, 01:31 PM
    Yes it was installed a few years back and paid for, I just kept calling them and now they won't call back. So I was checking to see if I could fix my problem instead of calling another company
    JonesHVAC's Avatar
    JonesHVAC Posts: 173, Reputation: 12
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    #8

    Oct 19, 2011, 01:53 PM
    You could replace the pipe yourself with 3"... make sure you use schedule 40 DWV PVC pipe though. Send the contractor a certified letter stating he has 10 days to respond to you in writing his intentions to fix his improper installation. A lawyer would probably handle this for you and collect his fees from the contractor. I don't normally suggest things like that but I also don't like to see someone get taken advantage of. Just a thought...
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