Carrier Flame Proving issue. No heat - help.


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Old 12-25-11, 08:21 AM
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Carrier Flame Proving issue. No heat - help.

Heat out. 30 yr. old Carrier 38GS03635.
Pilot lights - Sparking/igniting continues (30 sec.) - Igniting stops - Flame extinguishes - 1 min. later, blower operates but no heat as no flames.


Someone told me today that the issue is typical - a Flame Proving. I don't know what that means and am hoping someone could help me fix this issues on this cold xmas day.

Thank you,
Doug
xxx-xxx-xxxx
 

Last edited by Grady; 12-25-11 at 12:45 PM. Reason: Delted Phone Number
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Old 12-25-11, 08:42 AM
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check the flame sensor. I am not a carrier guy. a small rod that the flame hits. you could try cleaning it with fine emery cloth. when you say flame extingushes,do you mean pilot flame or the main burner flames?
 
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Old 12-25-11, 09:01 AM
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Thank you,
I mean the Pilot flame.
 
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Old 12-25-11, 09:51 AM
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BTW - thank you for replying so quickly.
I feel like I'm soooo close to getting it working.
I removed a guard plate to have better access to the coupler and was able to sand it a bit.
Now the flame stays lit just until the blower comes on (originally it was 1 min. later). Seems as though if the pilot flame would stay on just 1/2 a second more, it would ignite the burners.
But alas, it goes out just before the blower starts.
DK
 
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Old 12-25-11, 08:39 PM
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It sounds like you have a Carrier furnace with a pilot light that's lit each time the thermostat calls for heat. I would presume you have a plastic fitting with thee wires going to the pilot light, plus a high voltage connection to the spark electrode. Is that correct?

This system doesn't have a flame sensor to clean.

It sounds like the following is happening:

1: The thermostat calls for heat

2: The pilot burner gas and spark turn on.

3. The pilot lights and the spark continues operating.


You need to be more specific and detailed about what is happening after that. Igniting stops? Flame extinguishes? What does that mean?
 
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Old 12-26-11, 07:37 AM
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Thank you for replying. Yes, you are correct.
I (today) additionally sanded the metal tab that gets the pilot flame hits and VOILA - the burners lit! I wonder if perhaps I just got lucky though.
Saved $80 and learned more about HVAC.
Thanks again to you both.
Doug
 
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Old 12-26-11, 07:55 AM
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Well darn, looks like I got a bit too excited too soon. The burners turned off and I'm back to square one with the same symptoms.

"You need to be more specific and detailed about what is happening after that. Igniting stops? Flame extinguishes?"
YES, THE SPARKING STOPS AND THE VALVE STOPS THE FLOW OF GAS (I guess) and there is no longer a pilot flame.
What I don't understand is why the Sparker keeps sending its spark for so long. The pilot is lit and the sparking continues....then it stops as does the flame.

Doug


Read more: http://www.doityourself.com/forum/ga...#ixzz1helpGCbu
 
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Old 12-26-11, 08:47 AM
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>


What happens then? You need to describe all that happens if you want to get some help.
 
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Old 12-26-11, 02:47 PM
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I took out some screws and was able to get a better hold of the spark & rod sensor and do a much better job sanding - it's now working great! I can't believe it....I better shut up before I jynx it!
Thanks again!
Doug
 
 

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