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Old January 23rd, 2008, 05:19 PM   #1
ElDeeder
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Furnace problem, help!

Hot surface ignitor lights, burner comes on, blower comes on, burner is only on for a few seconds then goes out. Blower still runs, but no burner, so no heat.

My thought is the burner is bad, but wasn't sure if there is any kind of valve, or switch that could cause the gas to just surge and valve close and put the burner out.

Any help would be appreciated.
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Old January 23rd, 2008, 05:20 PM   #2
EL BURRO
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flame sensor??
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Old January 23rd, 2008, 05:26 PM   #3
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It is the igniter.
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Old January 23rd, 2008, 05:27 PM   #4
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reverse sensing optical flame couple
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Old January 23rd, 2008, 05:29 PM   #5
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reverse sensing optical flame couple
wtf are you talking about stoner?
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Old January 23rd, 2008, 05:32 PM   #6
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wtf are you talking about stoner?


I dont know, I figure if i throw out enough technical sounding words eventually i'll get it right
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Old January 23rd, 2008, 05:33 PM   #7
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You are thinking the Hot Surface Ignitor even though it lights up and starts the burner? I'm not familiar with furnaces, didn't realize the Ignitor could still be bad.
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Old January 23rd, 2008, 05:37 PM   #8
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Clean your flame sensor. Mine did the same thing
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Old January 23rd, 2008, 05:40 PM   #9
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Replace the thermocouple first. Under 20.00 If it has one. I don't know shit but mine went out a few times.

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Old January 23rd, 2008, 05:41 PM   #10
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You are thinking the Hot Surface Ignitor even though it lights up and starts the burner? I'm not familiar with furnaces, didn't realize the Ignitor could still be bad.
Mine was cracked. would still ignite the furnace, but go out afterwards. Can't tell visually it is cracked at first. Also when replacing make sure you do not touch it with bare hands. (new one that is)
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Old January 23rd, 2008, 05:42 PM   #11
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Replace the thermocouple first. Under 20.00

My bad. OAS is correct. I had to replace that too.
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Old January 23rd, 2008, 05:42 PM   #12
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Replace the thermocouple first. Under 20.00 If it has one. I don't know shit but mine went out a few times.


x2... I just had to clean mine this fall. For some reason it was dirty
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Old January 23rd, 2008, 05:45 PM   #13
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hopefully shawn will see this

it is either the flame sensor (i read that if the flame is on 7-10 seconds, then turns off, that is usually the cause). You can try to clean it with sand paper to get a few more weeks out of it.

If it turns off after about 2 seconds of flame, it is an air flow problem or gas delivery problem.
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Old January 23rd, 2008, 05:46 PM   #14
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I vote for a temperature limit switch getting tripped. That's what the furnace I just ripped out was doing, except mine took a while to build up enough heat inside the housing to trip the switch. When it got too hot, it would shut off the burner and the blower still stayed on because the furnace was not smart enough to know that the heat was cut off and it was still trying to satisfy the thermostat (12 year old furnace).

You're within range of Harley. PM him.
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Old January 23rd, 2008, 05:48 PM   #15
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Is the flame sensor a short maybe 1 1/2" or so long piece of metal by the burner?
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Old January 23rd, 2008, 05:52 PM   #16
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I say heat exchanger. Mine just went. Same thing. Inpsect for cracks and holes.

Mine would only light some times. Then I would see the flame roll out when the fan came on, and blew out the flame.

I only had to replace my furnace!
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Old January 23rd, 2008, 05:55 PM   #17
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I don't know that I have a thermocouple due to the fact that I have a Hot Surface Ignitor. I think the Hot Surface Ignitor takes the place of a thermocouple. I could be wrong though, and that wouldn't surprise me.
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Old January 23rd, 2008, 05:57 PM   #18
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Quote:
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I don't know that I have a thermocouple due to the fact that I have a Hot Surface Ignitor. I think the Hot Surface Ignitor takes the place of a thermocouple. I could be wrong though, and that wouldn't surprise me.
theromcoupler = no flame.

Ignitor = pilot flame.

Also take a pic of problem if possible. Lots guys that do this for a living are on here.
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Old January 23rd, 2008, 05:57 PM   #19
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I say heat exchanger. Mine just went. Same thing. Inpsect for cracks and holes.

Mine would only light some times. Then I would see the flame roll out when the fan came on, and blew out the flame.

I only had to replace my furnace!
Yeah, that's what was ultimately causing mine to do it. A bunch of the rivet-things that hold the two halves together in the interior aread had all fallen out and were letting heat out into the housing. When this happens, you also get soot inside the exchanger, which will build up and kill it over time.
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Old January 23rd, 2008, 06:00 PM   #20
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Quote:
Originally Posted by Apeman View Post
Is the flame sensor a short maybe 1 1/2" or so long piece of metal by the burner?
yes
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