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-   -   Nordyne Gas furnace won't stay lit (http://www.diychatroom.com/f17/nordyne-gas-furnace-wont-stay-lit-127567/)

MB1 12-24-2011 12:22 PM

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

harleyrider 12-24-2011 12:43 PM

Quote:

Originally Posted by MB1 (Post 801985)
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

ben's plumbing 12-24-2011 04:13 PM

yes iagree with harley....however some pictures would help since you said you replaced ignitor that included sensor you think..

harleyrider 12-24-2011 04:18 PM

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.

MB1 01-03-2012 11:48 PM

Pictures of Nordyne Furnace - Sensor Location?
 
6 Attachment(s)
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!!!!

MB1 01-03-2012 11:51 PM

One more photo
 
1 Attachment(s)
Here's one more photo...

jakerjenkins 11-20-2013 01:52 AM

did you find out what was wrong with your furnace as i have the same problem with mine

beenthere 11-20-2013 05:45 AM

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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