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Old 02-11-2011, 10:26 AM   #31
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Lennox Furnace burner won't stay on


You still need help echo?
Have you tried to clean the draft blower tube yet? The rubber tube is connected to the induced draft blower housing where the flue pipe comes into the unit. remove that end of the rubber tube abd clean out the fitting with a small piece of thermostat wire or stick pin (what ever will fit through the hole aboutv 1-2 inches) if you meet resistance then scale has partialy plugged the hole and the wire should clear it. put the tube back on and try to relight the furnace. let me know if it works for you

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Old 02-11-2011, 03:15 PM   #32
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Lennox Furnace burner won't stay on


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Originally Posted by college A/C
You still need help echo?
Have you tried to clean the draft blower tube yet? The rubber tube is connected to the induced draft blower housing where the flue pipe comes into the unit. remove that end of the rubber tube abd clean out the fitting with a small piece of thermostat wire or stick pin (what ever will fit through the hole aboutv 1-2 inches) if you meet resistance then scale has partialy plugged the hole and the wire should clear it. put the tube back on and try to relight the furnace. let me know if it works for you
No thank you. I fixed it by blowing into the red tube which is connected to the pressure switch. All fixed.
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Old 11-29-2011, 12:53 PM   #33
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Lennox Furnace burner won't stay on


Things are getting cooler in Texas and my downstairs furnace would not light...upstairs worked fine. After searching the internet, I found this forum. I removed the ignitor sensor and cleaned...no luck. Then I found this answer...removed red rubber tube, cleared it and cleared both ends out with a long paper clip...fired up after that. I could hear some tinking when the fan turned back on...assume that was the blockage.

Thanks!! Downstairs is warm again.

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Originally Posted by college A/C View Post
You still need help echo?
Have you tried to clean the draft blower tube yet? The rubber tube is connected to the induced draft blower housing where the flue pipe comes into the unit. remove that end of the rubber tube abd clean out the fitting with a small piece of thermostat wire or stick pin (what ever will fit through the hole aboutv 1-2 inches) if you meet resistance then scale has partialy plugged the hole and the wire should clear it. put the tube back on and try to relight the furnace. let me know if it works for you
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Old 03-10-2012, 09:58 AM   #34
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Lennox Furnace burner won't stay on


Hi All,
I had the same issue happen to me last night and this thread helped me resolve it. I had a hard time figuring which red tube to clean out on my unit "Lennox G51MP", so I wanted to include a picture in case it helps someone else in the future.
Thanks.
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Lennox Furnace burner won't stay on-furnace.jpg  

Last edited by TwitterD; 03-10-2012 at 10:01 AM.
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Old 11-29-2012, 11:23 PM   #35
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Lennox Furnace burner won't stay on


Thanks for posting the Fix Yuri.

I had similar symptoms and cleaning the flame sensor worked. For a while I thought it might be the blower because it would come on at times, but only run for 3-5 minutes. I'm glad I found your post. Temperature in NY tonight about 29 degrees.
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Old 01-02-2013, 02:42 PM   #36
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Lennox Furnace burner won't stay on


Dear Santa ,

I know you won't be back until next year but I am left out with a sick furnace. Please help me.

I have a Lennox Elite Series Furnace with pretty much connected problems with the ongoing thread.

This one, my furnace/burner kicks in but the blower would not come on. Actually, the blower clicks in, on and off several times and if I get lucky sometimes it picks up, otherwise, it just clicks and clicks. It's trying to turn on the blower but somehow it just can't.
Because of the many clicks, I have to manually turn off the Thermostat. At this point the burner's heat is wasted bcuz it was never circulated and picked up by the blower.

Any input would be greatly appreciated... grrrr (I'm cold).
Thank you
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Old 01-02-2013, 07:19 PM   #37
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Lennox Furnace burner won't stay on


sounds like the board is having issues......
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Old 01-02-2013, 10:41 PM   #38
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Lennox Furnace burner won't stay on


Carmon, thanks for the input.
Any specific I need to do on the board? I don't feel like replacing the whole board. But if I do, what are the possibilities to check first before it goes into the dump? I am the type of guy that gives a little fight first before I fold.

Thanks.

Last edited by JohnPlo; 01-07-2013 at 08:14 PM.
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Old 01-03-2013, 12:00 PM   #39
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Lennox Furnace burner won't stay on


Does your furnace have a little window over the integrated control panel? If so, take a peek in there and see if there are trouble codes flashing on the LED's. I have a Lennox G60 which has this diagnostic feature.
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Old 01-03-2013, 04:17 PM   #40
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Hi Dave, unfortunately, I don't have the screen window. I have a Lennox Elite Series G24M4 model which is fairly not that old I think.
But I notice there are 2 blinking LED lights. I'm not really sure if that's normal (is it?) since I didn't pay attention to it the first time if they're supposed to be stationary in the normal state.

What I did though is cleaned up the thermocouple/flame sensor and it's still remained to be seen at this point. I did this bcuz the burner does not hold long enough - it turns on for about a minute then off in seconds and back again.
I thought this probably confuses the blower when to do her own time dance...

Thanks again
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Old 01-03-2013, 06:07 PM   #41
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Lennox Furnace burner won't stay on


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Originally Posted by JohnPlo View Post
Hi Dave, unfortunately, I don't have the screen window. I have a Lennox Elite Series G24M4 model which is fairly not that old I think.
But I notice there are 2 blinking LED lights. I'm not really sure if that's normal (is it?) since I didn't pay attention to it the first time if they're supposed to be stationary in the normal state.

What I did though is cleaned up the thermocouple/flame sensor and it's still remained to be seen at this point. I did this bcuz the burner does not hold long enough - it turns on for about a minute then off in seconds and back again.
I thought this probably confuses the blower when to do her own time dance...

Thanks again
The two blinking lights are your diagnostic lights. All you need to do is see how they are blinking and make a notation. You can usually find the trouble codes on a sticker on the front of your furnace. The LED's can blink alternating fast, alternating slow, both on fast, both on slow, etc. I've attached a pic of the trouble codes sticker on the front of my furnace. The little viewing port is right below.
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Old 01-03-2013, 07:16 PM   #42
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Thanks for the info... I may search the code online since I could not decipher the characters. It's a little too small for my eyes.
I could see that your unit is pretty new.
My unit is the older type. When you take off the metal mail cover, it will expose the bare circuit board which does not have any troubleshooting codes. I guess, since it's the same maker(Lennox), I would assume they have similar hints of error.
For now my unit is still under observation since I cleaned the flame sensor with a fine steel wood sponge.
Also, I replaced the original vintage thermostat (thinking it was the problem) with a Venstar T5800. It's really cool and has a wi-fi where you can remotely control the temperature using your Android cell or iPhone apps. Just ordered the wi-fi unit at Amazon. I just got lucky and bought it at Craiglist for 60 instead of the full price of 230! and it's new too.
It's feels like the 'Back to the future' stuff. From a 1900 Thermostat to a 'Star Trek' era. Check it out guys. I'm sure it's worth it when you sell your house eventually.

Last edited by JohnPlo; 01-07-2013 at 08:16 PM.
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Old 01-06-2013, 08:33 PM   #43
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Lennox Furnace burner won't stay on


I will be trying this tomorrow. Hope it works. Freakin' cold tonight. Been sitting around 6-9 deg. F overnight, up to around 20 during the day for the last week or so.
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Old 01-07-2013, 02:17 PM   #44
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Lennox Furnace burner won't stay on


To all: Thanks for all your input.

I took apart my Lennox Burner (it's pretty simple thing: just need a little muscle to unscreaw a few bolts-5 I think), separated the burners (clean them up), then I took out the Flame sensor which is actually the Thermocouple.
I used the finest wool sponge (used for wood) and wiped the rod gently a few times. Put it back altogether.
So far, it worked. Never had any problems since(well, cross my fingers). It's been over a week now (using it 3-4 times daily).

I guess it's the beginning of a new year.

Thanks again guys... Happy New Year!

Last edited by JohnPlo; 01-07-2013 at 08:13 PM.
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Old 09-30-2013, 10:58 AM   #45
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Lennox Furnace burner won't stay on


Thanks for your info Our furnace would not stay lit. Cleaned flame sensor but did not help. Called for service man. He checked voltage from flame sensor and was OK. Said it must be circuit board and would cost $470. We first said OK but on checking internet found replacement board of about $200. I put in the board but still had the problem. On reading this post I thankfully read until I saw about the red hose. Tried that and SUCCESS. I will keep the old circuit board since we have two of the same furnaces and will therefore have a backup.
Thanks greatly for everybody sharing their problems and help.

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