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Author Topic: Gas oven burner issues  (Read 682 times)

Offline Noob002225

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Gas oven burner issues
« on: May 17, 2022, 08:13:08 PM »

Hello,

Recently cleaned a stove, things got messy, had to remove and clean the oven burner to clean it. Older model. Used baking soda paste and vinegar after.
When starting it I noticed a yellow flame around the thermocouple. With an endoscope camera and on the other side of the burner at the tip.

After cleaning I started it up and after around 1 minute the gas monitor started to pick up readings of 200ppm and climbing. In the oven chamber it was over 600. Did not look for yellow flame.
Reassembled and now there is a spike of ~30ppm once every 2 minutes. The yellow around the thermocouple flame is still there, haven't checked the other side. Carbon monoxide monitor did not detect anything.

There is some rust on the burner, but wholes seem clear. I could try to clear rust with white vinegar, but I don;t know how I could get inside the burner to scrub it, and it needs a coat of anti rust otherwise it will rust again?

Has it been reassembled incorrectly?
Does rust need to be removed?


Offline AJ

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Re: Gas oven burner issues
« Reply #1 on: June 08, 2022, 07:33:34 AM »
Hi,

Sorry you haven't received any replies yet. I personally have worked on very few gas ranges. Gets to be less and less of them in my area as the years go on.

Hopefully another more experience member can chime in.

Do you have it up and running yet?

Offline archibald tuttle

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  • Member Since: Jul 2013
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Re: Gas oven burner issues
« Reply #2 on: June 19, 2022, 10:10:40 AM »
my only experience of anything like this (nose or physical observation test vs. highly sensitive meter which I would now employ)
is a corroded burner assembly that allowed a little gas to escape from an area other than the standard flame outlets and far enough away that they do not provide ignition.

didn't really see in the picture whether there was an adjustment on the venturi area near the orifice that might have been out of place or whether the burner tube itself is not reinstalled in the correct place/orientation although it looks pretty standardly located.

i notice the orifice itself still seems to have a little corrosion but not in a way I would think would impact gas flow.

and i believe one picture is looking down the burner tube and seems to show it is not obviously blocked or occluded.

are your readings from a service meter taken in the oven or from a protective gas meter nearby the range?

we don't have a model number or exploded diagram but if this has an inline rather than end of line safety, is it possible that the piping or connections between the safety and the orifice where disturbed such that once the over is lit and the safety made you are experiencing small gas leak. and or if it is an end of line safety could the orifice installation or any plates or covers on the safety be compromised? (assuming from your description that this uncombusted gas is only detected following the burner lighting) I would bubble check anything downstream of the safety. the safety itself should be accessible for replacement so hopefully this could be done without too much difficulty. and or perhaps localize higher concentrate of gas pointing toward a source with a service sniffer if that is what you have.

brian

Offline Noob002225

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  • Member Since: Aug 2021
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Re: Gas oven burner issues
« Reply #3 on: June 19, 2022, 01:27:24 PM »
my only experience of anything like this (nose or physical observation test vs. highly sensitive meter which I would now employ)
is a corroded burner assembly that allowed a little gas to escape from an area other than the standard flame outlets and far enough away that they do not provide ignition.

didn't really see in the picture whether there was an adjustment on the venturi area near the orifice that might have been out of place or whether the burner tube itself is not reinstalled in the correct place/orientation although it looks pretty standardly located.

i notice the orifice itself still seems to have a little corrosion but not in a way I would think would impact gas flow.

and i believe one picture is looking down the burner tube and seems to show it is not obviously blocked or occluded.

are your readings from a service meter taken in the oven or from a protective gas meter nearby the range?

we don't have a model number or exploded diagram but if this has an inline rather than end of line safety, is it possible that the piping or connections between the safety and the orifice where disturbed such that once the over is lit and the safety made you are experiencing small gas leak. and or if it is an end of line safety could the orifice installation or any plates or covers on the safety be compromised? (assuming from your description that this uncombusted gas is only detected following the burner lighting) I would bubble check anything downstream of the safety. the safety itself should be accessible for replacement so hopefully this could be done without too much difficulty. and or perhaps localize higher concentrate of gas pointing toward a source with a service sniffer if that is what you have.

brian

Ended up getting a new stove.

I don't know if this is actually a problem.


Without any ventilation and a cracked window I get a reading around the ceiling. It can be from 60 to 300ppm. On the old unit I only tested the burners which are similar to this one with readings near the ceiling.
With ventilation with the stove on highest setting it goes to around 700ppm after 30 minutes.

With the new one is when using the oven I also get a reading.
Source is the exhaust from the oven, where the hot air is coming out. It hits 4500 ppm right next to the exhaust. The meter is saying concentration is ~9% which is in the range where methane can ignite.

Around a foot above the exhaust it reads ~300ppm. 4 feet away at ~5ft height 30ppm.

Offline archibald tuttle

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Re: Gas oven burner issues
« Reply #4 on: June 19, 2022, 01:58:51 PM »
I assumed you are talking unburnt gas and not CO2 or CO ?

is the new stove installed and you're getting nothing like that in the 'exhaust'?

brian

Offline Noob002225

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Re: Gas oven burner issues
« Reply #5 on: June 20, 2022, 01:38:22 AM »
I assumed you are talking unburnt gas and not CO2 or CO ?

is the new stove installed and you're getting nothing like that in the 'exhaust'?

brian

I use a gas leak meter which is for methane and other similar gasses, so unburnt gas.

I have not measured the exhaust ppm from the oven on the old unit, only on the new unit.

Offline archibald tuttle

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Re: Gas oven burner issues
« Reply #6 on: June 20, 2022, 02:58:02 PM »
So you're getting high unburnt gas readings from the new stove? I misunderstood  thought something was up with old stove and you had replaced it. So we were troubleshooting the old one for arguments sake, but the problem was solved by the new stove.

But you say you didn't test the oldstove with gas sniffer, so im guessing the new stove didn't pass the nose test after install and oven turned on which is what lead you to get out the digital sniffer? If thats the case, gotta be suspicious of the piping between oven control, safety and burner. If I read this right, theproblem only manifests qhen you turnon the oven?


« Last Edit: June 20, 2022, 03:01:34 PM by archibald tuttle »

Offline Noob002225

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  • Member Since: Aug 2021
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Re: Gas oven burner issues
« Reply #7 on: June 20, 2022, 05:38:19 PM »
So you're getting high unburnt gas readings from the new stove? I misunderstood  thought something was up with old stove and you had replaced it. So we were troubleshooting the old one for arguments sake, but the problem was solved by the new stove.

But you say you didn't test the oldstove with gas sniffer, so im guessing the new stove didn't pass the nose test after install and oven turned on which is what lead you to get out the digital sniffer? If thats the case, gotta be suspicious of the piping between oven control, safety and burner. If I read this right, theproblem only manifests qhen you turnon the oven?

By the time you answered I already got a new stove. I did take some readings of the old one but not of the oven exhaust.

Actually I don't smell the rotten typical of gas with the new stove at the exhaust so I'm not sure what is happening.