Question about Goodman GMS90703BXA Heater

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Where does the Oxygen for combustion come from- Indoor or outdoor?

Is there a separate feeder tube that feeds oxygen from outside for combustion or does the speace heater take indoor oxygen for conbustion?

I live in an apartment in Buffalo and I think I got a Goodman natural gas heater with model number U-18L.

I've been having a little shortness of breath that is concerning me. I would appreciate your answer.

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Where does the Oxygen for combustion come from- In - condensing_furnace_diagram.png

Gas heater normally get air for combustion from the outside as seen in this diagram.

Hope this helps...and hope you feel better soon!

Posted on Jan 18, 2008

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Posted on Jan 02, 2017

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If the black is soot and you have a odd smell then it may need a service .

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Yes, the Monitor 422 heater is direct vent type.

You must install the supplied double-walled vent tube between the heater and outdoors. Failure to properly install the vent tube will quickly deplete oxygen from the space it is operating in. That is a potentially deadly situation.

The pipe is special. The inner pipe is for hot exhaust gasses to be sent outside and the outer walled pipe is for fresh combustion air to be brought into the heater. This set up is why the heater does not create drafts in the home.

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14 Overheat Wrap Fault
Ensure high fire and low fire manifold pressure are correct.
Check gas type of unit and ensure it matches gas type being used.
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My rinai gas heater is not reallly lighting up though gas flow seems alright


Gas also requires oxygen to burn, perhaps there is an issue in an air feeder or mixing valve some where in your piping or if there is an inlet for air ensure that it is not obstructed. Using any combustion device in a confined space can be problematic for health reasons and the combustion process due to a finite oxygen supply. I hope this helps your investigation.

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1 Answer

My 606 reliance gas water heater run for 5min and pilot goes out


If the pilot will light and stay lit, then ECO is not tripped, and thermocouple is probably good.
If ECO is tripped, then pilot will have no gas.
Usually if thermocouple is bad or installed incorrectly, the pilot goes out immediately after releasing the pilot knob during lighting.
http://waterheatertimer.org/How-to-test-water-heater-thermocouple.html

First thing is to clean water heater air intake and get more fresh air to the water heater and see if that solves problem. Combustion of hydrocarbon requires oxygen that must be pulled into the water heater from surrounding rooms. If water heater is closed off, or located in hot attic that is not correctly vented, or house is tightly sealed, or air intake is clogged, then there is not enough oxygen to support combustion.

Next thing to check is color and size of pilot flame.
If color of flame is NOT clear blue, or if flame is weak, then that says the pilot orifice and burner tubes and burner should be removed and cleaned, along with cleaning combustion chamber.

Additional suspects include combination of things, including: , bad gas control valve, low gas pressure, air in gas line, water dripping down vent and putting out pilot, reverse air flow or backdraft down the vent that blows out pilot, damaged burner parts because of exposure to trace chemicals such as bleach and wax.
Open following link to see various images and read resources.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

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1) Open following link for how-to resources, illustrations, and service manuals for some brands of heater.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

2) Many things can cause pilot problems, including bad thermocouple, air in gas line, low gas pressure, negative pressure in house, bad venting, very hot attic, lack of combustion air, dirty combustion parts and dirty pilot tube, bad gas control, reversed polarity on electrical outlet.

3) If pilot flame is clear blue and strong, then next step is check that thermocouple sits in the flame, and then change thermocouple. This is start point. Following step would be reading service manual for exact troubleshoot and testing steps.

4) If pilot flame is yellow-or-orange or weak, then clean dirty combustion parts including pilot tube and air intake. Might want to change thermocouple while combustion parts are removed for cleaning.

5) Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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You have tank-type gas water heater:
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Open following links for troubleshoot resources:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf

http://waterheatertimer.org/images/Water-heater-in-attic-800.jpg
http://waterheatertimer.org/images/Test-water-heater-vent-1400.jpg

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