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Old 06-23-2015, 10:07 PM   #1
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Furnace burner doesn't stay lit

For the last couple of weeks the furnace has been working fine. Went to light it yesterday and the burner lit but the igniter kept snapping and soon after the burner shut down.

Is this a flame sensor problem? Where do I start?
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Old 06-23-2015, 10:34 PM   #2
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The ignitor (snapping sound) is also the flame sensor. When the flame is present and the ignitor is in the right position, the flame essentially extinguishes the sparking and then the circuit board says... good, flame is established. That keeps the gas flowing as the circuit board continues to send power to the gas valve.

When the spark finger is not in the right position the flame does not extinguish the spark and the circuit board says "oh, no lighting of the gas, turn it off". So, probably your spark finger is not properly positioned. You will have to go to the Suburban service manual to find how that finger is adjusted properly. (or other brand service manual if it is not a Suburban furnace). It also could be just a dirty ignition spark finger, you can remove it and clean it.

The other possibility is that the circuit board itself is defective, but since you have spark and ignition, but rapid shut down, it is more likely that it is a spark finger adjustment or cleaning that needs to be done.
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Old 06-24-2015, 09:18 AM   #3
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Thanks - I'll pull out the spark finger and make the proper adjustments and clean them up and see if that helps.For reference, the furnace is a Suburban NT-30MB.
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Old 06-24-2015, 09:27 AM   #4
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Also could be a pressure issue, failed/failing regulator. Do the stove burners appear to be normal? Fridge and water heater running ok on propane?
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Old 06-24-2015, 09:53 AM   #5
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Haven't used the fridge on LP, and having only lit the hot water tank briefly to see if it functioned I can't really speak to that either, but it seemed to be fine. The stove and the over appear to function normally as well, however I did notice that it took a LONG time to boil a kettle on the stove on the last trip, maybe that's a clue?
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Old 06-24-2015, 10:12 AM   #6
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http://www.airforums.com/forums/f427...al-131134.html
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Old 06-24-2015, 12:19 PM   #7
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Hello
Maybe your exhaust is clogged up with hardened mud from dirt gobber wasps. just a thought, if its clogged just stick, a stick into exhaust pipe if see if its clogged up. clean it out with a vacuum if you cant get it all.
worked for us.
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Old 06-24-2015, 03:19 PM   #8
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The clogged inlet/exhaust though is a good one to explore. It can happen pretty quickly. But my experience is that sometimes they get way deep into the intake and you cannot find the clog without total disassembly, which is not easy.

What does the flame look like when it briefly lights? Nice and hard blue, or a sooty yellow look? If you leave the inspection cap off, does the flame blow out the port? A sooty flame or a flame blowing out the port indicate a clogged up intake or exhaust.
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Old 06-24-2015, 04:08 PM   #9
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I had the furnace disassembled and cleaned it out thoroughly. There was a LOT of black soot inside. The ports are clean as a whistle. Since the cleaning, the flame is blue on the bottom with bits of yellow on the top. I'd like to adjust the burner, but can't do so until the thing runs properly...
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Old 06-25-2015, 12:34 AM   #10
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Here's a video of what this guy is doing:

https://youtu.be/U4xvAx36oPE
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