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Old 10-26-2011, 12:54 PM   #1
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Lennox G26Q3-75-1 Furnace won't light


I have a Lennox furnace model G26Q3-75-1 using LP that is not lighting. When I turn the unit on, the draft inducer runs for about 20-30 seconds and then the electronic igniter begins to arc but the main burner doesn't light. I had the gas valve replaced on 10/15/09, but I can't remember if this is the same problem that I had before. Any ideas?

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Old 10-26-2011, 04:24 PM   #2
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Lennox G26Q3-75-1 Furnace won't light


Pilot could be dirty.

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Old 10-26-2011, 05:11 PM   #3
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Lennox G26Q3-75-1 Furnace won't light


Dirty pilot, bad gas valve or ignition module gone crazy. Checking to see if there's 24 volts going from the ignition module to the gas valve pilot side would be a good place to start.
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Old 10-27-2011, 07:49 AM   #4
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Lennox G26Q3-75-1 Furnace won't light


Removed and cleaned pilot orifice. No change.
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Old 10-27-2011, 07:50 AM   #5
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Lennox G26Q3-75-1 Furnace won't light


Does it continue to ark while the pilot flame is lite.
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Old 10-27-2011, 08:20 AM   #6
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Lennox G26Q3-75-1 Furnace won't light


It continues to arc but I don't see a pilot, Usually, the igniter arcs and the main burner lights within a second or two.
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Old 10-27-2011, 03:15 PM   #7
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Lennox G26Q3-75-1 Furnace won't light


Did you blow through the pilot line and the pilot after you cleaned it?
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Old 10-27-2011, 03:27 PM   #8
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Lennox G26Q3-75-1 Furnace won't light


Just the pilot, not the line.
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Old 10-27-2011, 03:38 PM   #9
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Lennox G26Q3-75-1 Furnace won't light


Check if anything is coming through the line.
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Old 10-31-2011, 04:42 PM   #10
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Lennox G26Q3-75-1 Furnace won't light


I removed the pilot tube and the orifice. I soaked the orifice in white vinegar, blew it out and I can see light through two small holes. I blew through the pilot tube and it is clear. I checked for voltage at the PV terminal of the gas valve and I am showing 25.9v. It is sounding like another bad gas valve, this one was replaced in Oct. 2009.
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Old 10-31-2011, 05:04 PM   #11
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Lennox G26Q3-75-1 Furnace won't light


Its possible. Highly unusual though. So see if you can figure out what might be harming the valves.
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Old 11-01-2011, 04:56 PM   #12
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Lennox G26Q3-75-1 Furnace won't light


Well, I tried one last fix on the recommendation of a friend. He told me to disconnect the pilot tube at the gas valve and turn the furnace on to call for heat. When the igniter starts to arc, check for gas coming out of the gas valve where the pilot tube installs. If gas flows, the valve is good! I did this and there was gas coming out. So I removed the other end of pilot tube at the igniter, checked eveything again to make sure it was clear, and took some fine sand paper and cleaned up the igniter. I put eveything back together, turned on the furnace, and it fired right up. Long story short, the gas valve is OK and at worst, I probably need to replace the pilot igniter. Thanks to all for your input and help.
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Old 11-22-2012, 07:35 AM   #13
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Lennox G26Q3-75-1 Furnace won't light


Quote:
Originally Posted by bigalp View Post
I removed the pilot tube and the orifice. I soaked the orifice in white vinegar, blew it out and I can see light through two small holes. I blew through the pilot tube and it is clear. I checked for voltage at the PV terminal of the gas valve and I am showing 25.9v. It is sounding like another bad gas valve, this one was replaced in Oct. 2009.

Hi bigalp,

could you tell me if 25.9V is a DC or AC?

thanks lot

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