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Goodman GMPN gas furnace shuts down

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patrickor
patrickor Member Posts: 1
in Gas Heating

Hello,

I'm new to this forum.

My GMPN shuts down after about 2 to 3 minutes. Pressure switch closes when inductor fan runs. Flame sensor cleaned, then replaced. It measures proper micro Amp reading (~4 uA) when flame is present. Control board replaced (twice); no flash codes from status LED. No roll-out interruption.

What am I missing? Any help appreciated.

Patrick

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,172

    So I take it that the inducer starts, pressure switch proves air, pilot ignites are you getting main flame at all? I see this furnace is hot surface ignition is it glowing?

    You could try jumping the pressure switch after it proves (Temp…don't leave it this way) it could be momentarily opening when the main gas comes on.

    You will have to check for 24 volts at the gas valve. Is it powering the gas valve at all?

    I see it has stack over temp switch, roll out, high limit etc.

  • Ironman
    Ironman Member Posts: 7,807

    If the condensate drain or trap is partially clogged, that can cause what you’re describing.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • HVACNUT
    HVACNUT Member Posts: 7,157

    Trial for ignition takes less than 2 to 3 minutes, so flame is established across all burners, runs for a minute or two, then the flame drops out? Does the blower come on during this process? Does it keep repeating the process but never locks out?

    If you have a meter that can capture readings, test all safeties and limits one at a time and see what opens first in the series.

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