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Old 10-10-2012, 08:12 PM   #1
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Coleman Evcon Model AGU07512A flame sensor?


My furnace keeps turning on and shutting off after about 10-15 seconds. I'm fairly certain the problem would be a dirty flame sensor, but I cannot for the life of me locate it on this model. Does this particular furnace not have a flame sensor? Or is it hidden in the belly of the unit? This is really bugging me, as most furnaces I've dealt with in my homes have had flame sensors that are fairly easy to locate. Any help is greatly appreciated.

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Old 10-10-2012, 08:36 PM   #2
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Coleman Evcon Model AGU07512A flame sensor?


Flame sensor is usually in the opposite position of the Igniter.

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Old 10-10-2012, 08:43 PM   #3
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Coleman Evcon Model AGU07512A flame sensor?


This particular model has a standing pilot, and from what I recall, the flame sensor is usually visible in front of the flame furthest from the pilot, but no luck.
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Old 10-10-2012, 09:12 PM   #4
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Coleman Evcon Model AGU07512A flame sensor?


http://www.searspartsdirect.com/part...10042501/00001
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Old 10-10-2012, 09:36 PM   #5
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Coleman Evcon Model AGU07512A flame sensor?


I found that, too. I can't discern from the schematic where the flame sensor is or if it even has one. It isn't listed in the parts for sale on the right. I'm assuming it's inside another part or something?
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Old 10-10-2012, 10:13 PM   #6
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Coleman Evcon Model AGU07512A flame sensor?


Someone told me this model may not have a flame sensor and that this problem could be caused by a bad thermocouple? Do the symptoms I'm experiencing sound like something that could be cause by a thermocouple? THe pilot light stays lit and burns strong.

Josh
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Old 10-10-2012, 11:09 PM   #7
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Coleman Evcon Model AGU07512A flame sensor?


A model # or a picture may help the situation....
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Old 10-10-2012, 11:36 PM   #8
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Coleman Evcon Model AGU07512A flame sensor?


Quote:
Originally Posted by JoshuaHackler View Post
Someone told me this model may not have a flame sensor and that this problem could be caused by a bad thermocouple? Do the symptoms I'm experiencing sound like something that could be cause by a thermocouple? THe pilot light stays lit and burns strong.

Josh

Yes, check this out.

http://homerepair.about.com/od/heati...ot_light_2.htm
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Old 10-10-2012, 11:55 PM   #9
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Coleman Evcon Model AGU07512A flame sensor?


if pilot stays lit then you most likely have a thermocouple which is the flame sensor ..which is operating properly...once main burners ignite, then shut down,.... could be due to roll out switch located at front of burners, that gets overheated if the flames blow back towards front when main gas opens..the roll out switch cuts off gas valve to prevent fire from back up of flames..this can be caused from dirty burners

Note: to find flame sensor follow tiny copper tube from main gas valve down to pilot burner OR may just be single wire from pilot burner back to gas valve in which case you have a flame rod sensor..usually a flat steel panel covering front of burners ..may have to remove to see everything..OR if flame rod then pilot could get distorted upon main gas light off causing temporary loss of signal.
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Old 10-11-2012, 01:08 AM   #10
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Coleman Evcon Model AGU07512A flame sensor?


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Originally Posted by carmon View Post
A model # or a picture may help the situation....
Coleman Evcon Model AGU07512A

Don't have a picture right now, if need be I'll try to get one up later.

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