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Old 11-06-2010, 10:21 AM   #1
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Goodman Furnace GMPN100-4 ignition question


My GOODMAN GMON100-4 is having trouble starting. The ignitor visually looks to be in good shape. The unit will kick on, the circuit board will click to light the ignitor. I have watched 3 things happen. Sometimes the Ignitor glows orange and fires up, and sometimes it won't glow at all, and sometimes is glows then dies before the gas kicks on, and it may glow and start the unit on the next attempt during the starting cycle. As you probably know, the unit will cycle through 3 start attemps, and then will shut itself down and wait for a reset.

I just pulled the board out and cleaned all the contacts on the board. The furnace now kicked on 3 times in a row on the first try with the ignintor glowing super-orange! I will assume the board is probably going as it is about 17 years old. I looked on-line and the replacement boards specified for my model are not the same configuration as what is in my Goodman. One major difference is a 9 pin DIN connector on the new board that is not on mine. Can I follow the same schematic that I have with my heater and move it to a new board easily or should I bring someone out to rewire the machine? The unit is still very clean and in really good shape!

Thanks for any advise you can give.

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Old 11-06-2010, 11:28 AM   #2
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Goodman Furnace GMPN100-4 ignition question


The igniter may be dying. Check it with an ohm meter when it is cold. Should be between 40-80 ohms. If it is OK then the replacement board is a retrofit and they should include a cable and instructions with it. Buy it from a reputable dealer, not zbay. There were heat exchanger cracking issues with those units so it should be properly inspected by an experienced tech.

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Old 11-06-2010, 11:42 AM   #3
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Goodman Furnace GMPN100-4 ignition question


Thanks yuri. The unit is back and forth again. I'll try the ohm meter and if not good I will order a board. I saw one on allpartsheating.com. Is that a good place?
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Old 11-06-2010, 11:54 AM   #4
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Goodman Furnace GMPN100-4 ignition question


search: homeairdirect, one of our buds and should know how to cross reference it and answer your questions.
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Old 11-06-2010, 01:24 PM   #5
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Goodman Furnace GMPN100-4 ignition question


Cold is 110 ohms.
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Old 11-06-2010, 02:36 PM   #6
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Goodman Furnace GMPN100-4 ignition question


If it is a approx 1" wide black type then it should not be more than 75 ohms, usually around 50-55 ohms. If it is a much smaller/skinnier one then I don't know the ohms on them but I doubt they are more than 90 as that is what the Lennox use. Sounds like yours is cracked and barely holding together and intermittently completing its circuit. High ohms indicates too much resistance/cracked. Try a new one B4 changing anything else. 1st pic is the regular one, 2nd is newer smaller version. PS, they are INCREDIBLY fragile, look at them the wrong way and they break. Hope you have soft hands. The universal ones don't always fit the Goodmans so I would try get the OEM one as it has a special slot/ridge on it.
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Last edited by yuri; 11-06-2010 at 02:43 PM.
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Old 11-06-2010, 04:11 PM   #7
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Goodman Furnace GMPN100-4 ignition question


It is the black one and thanks alot for the direction! I'll let you know!
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Old 11-10-2010, 08:00 PM   #8
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Goodman Furnace GMPN100-4 ignition question


known for cracked heat exchangers!
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Old 11-14-2010, 02:13 PM   #9
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Goodman Furnace GMPN100-4 ignition question


Replaced the board and the ignitor. Runs great.

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