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Old 01-10-2012, 11:21 AM   #16
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Lennox HVAC in Watchguard Mode (4+1)


If you use steel wool wipe the rod down with alcohol after cleaning. Steel wool has an oil coating so it doesn't rust in storage which will make the sensor foul quicker.

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Old 01-10-2012, 12:04 PM   #17
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Lennox HVAC in Watchguard Mode (4+1)


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Originally Posted by onefastwrex View Post
Please forgive EM as I know very little about HVAC units. To avoid a duplicate thread, before posting, I did try searching and I have read through a few different posts on a few different forums and not found a definitive answer. If someone can either point me in the right direction to a link with instructions, or give me a qucik how-to I would be greatly appreciative.

I have a Lennox HVAC unit (I have the HVAC model as c33-25a-2f-2, but I believe that is the AC unit), I am not sure of the ingition model and I am at work now and can not check. I took pictures of the unit and can send them to someone if that would help identify it. It was installed in 2006. I am not getting heat on a regular basis. I am getting a 4+1 error code light ( Red blinks 4 times then blinks 1 time) which according to the sticker on the box indicates (Burner failed to ignite, exceeded maximum retries). The only way I have found to fix this temporarily is to shut off power to the unit, wait about a minute, and turn the power back on. When I do this, it will either come back on and stay on until the desired thermostat temp is met, or it will try to ignite ( flame for 3 seconds from burners) and then turn back off. It tries it a few times and then the red light starts blinking again. I removed the panel/cover to expose the unit and can see through a little round glass window. From what I can see in there, there are 3 burners that the gas is coming out of. On the burner futhest to the right, there is a rod that glows orange (ignitor?) before the flames come on. That rod looks like it comes up from the bottom. There is also a rod(sensor?) in front of the far left burner that does not light up that looks like it comes in from the top. I believe that is the rod that proves flame to the board to keep the gas on. I have read on previous posts to clean the rod. Is the rod on the left the one I want to clean? It looks like it should be removable. I see on the top of the ignition unit there is a cap with wires going to it, it looks as if I remove that, the rod would come out with it. I havent messed with it yet because I know very little about HVAC systems. My quesiton is, how does this piece come out (pull out, twist?), and do I need to shut off power and gas to the unit before removing this rod to clean it? Or is there something else that could be causing the issue?
Please forgive me as I obviously mis-read your first post.......simply removing and cleaning the flame sensor will return your furnace to normal operation, again please forgive my error.
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Old 01-10-2012, 01:09 PM   #18
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Lennox HVAC in Watchguard Mode (4+1)


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Originally Posted by harleyrider View Post
Please forgive me as I obviously mis-read your first post.......simply removing and cleaning the flame sensor will return your furnace to normal operation, again please forgive my error.

No apology needed, I appreicate you taking the time to help me rectify my issue!
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Old 01-10-2012, 01:10 PM   #19
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Lennox HVAC in Watchguard Mode (4+1)


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Originally Posted by Marty S. View Post
If you use steel wool wipe the rod down with alcohol after cleaning. Steel wool has an oil coating so it doesn't rust in storage which will make the sensor foul quicker.
Thank you for the tip! I will be sure to do so!
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Old 01-10-2012, 04:28 PM   #20
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Lennox HVAC in Watchguard Mode (4+1)


SUCCESS!!! Thank you all for the information. I removed, cleaned and reinstalled the flame sensor and it fired up no problem on the first try! I appreciate all the help guys! You are the best!

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