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Old 12-24-2011, 12:22 PM   #1
MB1
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Nordyne Gas furnace won't stay lit


My furnace runs but does not blow warm air. It tries to ignite for four cycles and then flashes the warning for a weak flame. I thought the issue was the ignitor (which I think includes the Sensor) and replaced the ignitor (carbide, pinky size with white nipple on end, and two wires at the end). I have a nordyne 703911a, almost nine years old. (Oh, I was very careful not to damage the new ignitor)

More details: When I cycle on the heat, first I have as solid red light, then gas valves opens and ignitor gets red hot. Gas lights. I get a steady yellow light indicating flame is sensed, then the flame goes out in around 20 seconds, and I get flashing yellow lights indicating a weak flame. Then four red for the lockout due to failed ignition. This cycles four times. Furnace is 9 years old. Thank youin advanc for any advice to my problem!!!

Thank you,
Marcu

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Old 12-24-2011, 12:43 PM   #2
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Nordyne Gas furnace won't stay lit


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My furnace runs but does not blow warm air. It tries to ignite for four cycles and then flashes the warning for a weak flame. I thought the issue was the ignitor (which I think includes the Sensor) and replaced the ignitor (carbide, pinky size with white nipple on end, and two wires at the end). I have a nordyne 703911a, almost nine years old. (Oh, I was very careful not to damage the new ignitor)

More details: When I cycle on the heat, first I have as solid red light, then gas valves opens and ignitor gets red hot. Gas lights. I get a steady yellow light indicating flame is sensed, then the flame goes out in around 20 seconds, and I get flashing yellow lights indicating a weak flame. Then four red for the lockout due to failed ignition. This cycles four times. Furnace is 9 years old. Thank youin advanc for any advice to my problem!!!

Thank you,
Marcu
locate and clean the flame sensor

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Old 12-24-2011, 04:13 PM   #3
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Nordyne Gas furnace won't stay lit


yes iagree with harley....however some pictures would help since you said you replaced ignitor that included sensor you think..
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Old 12-24-2011, 04:18 PM   #4
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Nordyne Gas furnace won't stay lit


After re-reading and thinking this post, I am leaning to a dirty pilot/sensor instead of just the sensor. We must remember that a good ground is crucial as well.
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Old 01-03-2012, 11:48 PM   #5
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Nordyne Gas furnace won't stay lit


All, thank you for the replies. Now that I am back from the Holidays, I'm still cold in my place! Attached are some photos. I noticed the weak flame gets blown out once the fan kicks on (i.e almost immediately after it ignites). Here are photos. The ignitor is new. Which is the sensor that I would need to clean? Does anything look wrong? Thank you!!!!
Attached Thumbnails
Nordyne Gas furnace won't stay lit-2012-01-03-19.48.42.jpg   Nordyne Gas furnace won't stay lit-2012-01-03-19.49.01.jpg   Nordyne Gas furnace won't stay lit-2012-01-03-19.49.43.jpg   Nordyne Gas furnace won't stay lit-2012-01-03-19.50.36.jpg   Nordyne Gas furnace won't stay lit-2012-01-03-19.50.53.jpg  

Nordyne Gas furnace won't stay lit-2012-01-03-19.51.24.jpg  
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Old 01-03-2012, 11:51 PM   #6
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Nordyne Gas furnace won't stay lit


Here's one more photo...
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Nordyne Gas furnace won't stay lit-2012-01-03-20.08.03.jpg  
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Old 11-20-2013, 01:52 AM   #7
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Nordyne Gas furnace won't stay lit


did you find out what was wrong with your furnace as i have the same problem with mine
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Old 11-20-2013, 05:45 AM   #8
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Nordyne Gas furnace won't stay lit


If the flame goes out as soon as the furnace blower comes on. It generally means the heat exchanger has a crack or a hole in it. And needs replaced. Often better to replace the entire furnace.

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