Question about Goodman GDS80904BNA Open Flame Heater

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Goodman GMP 125-4 one blinking light code. Gas valve has been replaced (at cost of $443). Didn't fix problem. Same co wanted $415 to replace circuit board. I did it myself for $99 part. Still same problem! What else can I try?

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One blink means it didn't light after a number of attempts. You replaced the circuit board and gas valve. Read on for some suggestions. On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Posted on Nov 18, 2009

Testimonial: "This helps explain what other options must be checked. Now I need a "how-to" so I can do it! Thank you!"

  • Chandler Ede
    Chandler Ede Nov 20, 2009

    Get in front of the furnace, have a helper turn up the thermostat. Remove the panel(s) on the furnace, tape the door switch down. Watch and listen to what the furnace does. Follow the advise I gave you and it will lead you in the right direction.

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1 Answer

Have a gmp 125-5 furnace and light blinks 5 times


Here what i found , five LED flashes to mean your furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.

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I have a Goodman GMP 125-5 furnace. It had a 3 light code i replaced the presure switch now it is giving me a 1 light code please help


A sampling of various failure codes on a furnace:

Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting. After one hour of lockout, your furnace will automatically reset itself and try to operate as usual.

Decipher two LED flashes to mean the draft blower is not working, or your furnace has a short in the pressure switch circuit. Turn off the furnace power and repair a short or replace the pressure switch.


Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection. Also, look for blockages in the flue, and tighten any loose wiring.

Translate four LED flashes to mean your furnace has a primary limit circuit open, possibly from loose wiring or blocked filters. Check and clean filters, tighten wiring and check the flue for blockages.

Interpret five LED flashes to mean your furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.



Read seven LED flashes as a warning of a low flame sense microamp signal. This could happen with a coated flame sensor or a lazy flame from poor gas pressure. Turn off the power and adjust the gas pressure according to the information on the rating plate.



See eight LED flashes as meaning an igniter circuit problem due to a bad igniter or an igniter connected improperly. Replace the bad igniter or check the ground wiring, making necessary corrections.



Decipher nine LED flashes to mean the high-stage pressure switch circuit will not close during a high-stage-induced draft blower operation. Your furnace may have a pinched or blocked pressure switch hose, a blocked flue or loose wiring.

Read continuous flashing on the LED to mean your furnace has a reversed polarity of 115 volts. Turn off the power and correct the wiring polarity after reviewing the wiring diagram.
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1 Answer

My Goodman GMP 125-4 furnace has 4 blinking lights and we currently are unable to get it to come on. What might be wrong?


if this is an error code and you mean that the light blinks 4 times then it is the limit circuit. This could mean either the high limit or a roll out switch is open. the limit switch is right in the center of the furnace above the burner and roll out switches are probably somewhere around the opening of the burner. Follow the wires from the limit to find a roll out switch cause they are in line with each other and the rool out switch could have a button to reset it. However if the roll out is not tripped then you could need to change the limit. Only way to know is to check for continuity.

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I have a goodman GMP 125-5 furnace. I have


sounds like the primary limit typically behind the gas valve its larger then the others, rectangle in shape with 2 wires going to it. be careful if your bypassing limit this can create a very hazardous condition

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No, the board isnt out. The board has a code telling you that its out. Its your flame sensor. You wouldn't have gotten any heat if the gas valve was out. check if that flame sensor goes to another sensor on the same circuit , if it does check that. If it just a one wire sensor make sure its in the right position. If its a one rod flame senor with one wire I would sand it down with sandpaper. if its a two wire senor ohm it out to see if you ger current going through it.


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