Nordyne Gas furnace won't stay lit

MB1 · 12-24-2011, 12:22 PM

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

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

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

Here's one more photo...

12-24-2011, 12:22 PM	#1
MB1 Member Join Date: Dec 2011 Posts: 47	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

12-24-2011, 04:13 PM	#3
ben's plumbing Member Join Date: Oct 2011 Posts: 3,225	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..

12-24-2011, 04:18 PM	#4
harleyrider Member Join Date: Feb 2007 Location: NW Ohio Posts: 804	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.

01-03-2012, 11:48 PM	#5
MB1 Member Join Date: Dec 2011 Posts: 47	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

01-03-2012, 11:51 PM	#6
MB1 Member Join Date: Dec 2011 Posts: 47	Nordyne Gas furnace won't stay lit Here's one more photo... Attached Thumbnails

Nordyne Gas furnace won't stay lit