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-   -   Goodman GMP Furnace won't stay lit. (

JoelT 11-28-2007 04:43 PM

Goodman GMP Furnace won't stay lit.
Was getting the idea that I should try cleaning the sensor to see if that works....any clues on where to find it?

Model GMP075-3 has a filament that heats up, ignites one burner which lasts like 10 seconds, its the only one that lights...

thanks in advance..

JoelT 11-28-2007 09:08 PM

OK ive located the flame sensor and it seems like it is acting like it doesnt work because its not getting flame, only the first burner is igniting....
any ideas

#CARRIERMAN 11-28-2007 09:33 PM

Hi JoelT

If you are mechanicaly inclined, you will need to pull and clean the burners and remove and check the orfices and check them for spider webs. Just make sure you shut the power off to furnace before attempting any repairs.
You will need a good wire brush and you can use soapy water to finish cleaning. If you choose this method make sure you rinse the burners well and let them thoroghly air dry before reinstalling. The method I prefer is compressed air, but not everyone has this means. Water works just as well but takes longer due to dry time. Hope this helps.

Good luck

JoelT 11-29-2007 12:59 AM

I can do compressed air...should I try compressed air before I start unscrewing things just to see if i can avoid the trouble?

#CARRIERMAN 11-29-2007 08:42 AM

Hi JoelT

Unfortunately the answer to your question is no. It would only be a temporary fix at best if you were able to get it to work. You have to use the wire brush on the burner end to clean the dirt and rust out of the jumper slots. This is why only one burner is lighting. If you decide to take this on yourself, when you remove the burners you will see a big round thing in the middle of the burner, this is the atomizer section. This is important to get clean, but the most important part are the slots on either side of the burners. These are how the burners ignite each other, this is somewhat time consuming but is a must for proper igntion of the burners. Just make sure if you attempt this as I said in the previous post, make sure to turn the power off to the furnace and its also a good idea to turn off gas supply when doing this repair. Its not too tough to do, just take your time and make sure you reinstall the removed parts properly.

Good luck

JoelT 11-29-2007 08:56 AM

I'll give it a shot, I sure appreciate your help, you might have just save me a world of headache..:thumbsup:

JoelT 11-29-2007 12:42 PM

Ok so I removed the burners, used a wire brush and compressed air on each one and each groove (to be honest it looked brand new) and still the same result.

I am wondering though, it seems like the burners can be adjusted on their "rack" and the "fins" aren't meeting up with each other on the corners is this important?

also the HSI and the sensor are a touch off center, but still both work

(HSI ignites first burner and when i manually light the one with the sensor the unit stays on:whistling2: )

anyway I appreciate all the help

#CARRIERMAN 11-29-2007 07:36 PM

Hi JoelT

Did you remove and check the brass orfices while you had the burners out. If you didn't as I noted in the original post you could possibly have some kind of blockage in the orfice. The most common thing is a small spider web. If you are lighting this furnace manually and you still have gas coming out of the other burners and could cause a potentially deadly situation. Don't be afraid to call in the pros if you don't get your furnace going.

Good luck

JoelT 11-29-2007 10:13 PM

I pretty thoroughly dissasembled the entire burner assembly and cleaned all orifices, crevices, nook or cranny with compressed air and the wire brush as i could reach....

no luck:censored:

I know its a physical blockage...this is a mystery to me....

Oh well, Ill let you know what the qualified tech says if your interested...

again thanks for all the help...:thumbup:

hammer9191 12-16-2012 10:47 AM

Had same problem burners not staying on after they are lit, tech change lighter and senors finally change control board. Furance working great now try changing circuit board.

danpik 12-16-2012 11:24 AM

This post is over 5 years old. I am sure the OP got it working by now. Also, I doubt very much that the control board was his problem. I am sure that was not the real problem with yours either

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