Lennox Innovator Furnace and Watchguard Mode

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Old 03-07-13, 05:52 AM
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HELP - Lennox Innovator Furnace and Watchguard Mode

I have been having a problem with my Lennox furnace. For the past week or so it would go into watchguard mode and I would fiddle with the thermostat to get it to turn back on. It would turn on and heat, but then after a couple of cycles it wouldn't come back on. Now it isn't turning on at all. I checked to blinking light code and got Watchguard mode - burners failed to ignite. When I try to restart it the starter glows red, then the burners ignite for about 3/4 of a second and go out, this repeats about 4-5 times and then it goes back into watchguard. I tried cleaning the flame sensor, but that didn't fix it. Anybody have any idea what might be wrong?
 
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Old 03-07-13, 04:14 PM
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Video

I made a video of what I am seeing when the furnace tries to start. Hope somebody can help.

https://www.youtube.com/watch?v=b3KC_wCxGPc
 
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Old 03-07-13, 06:33 PM
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Welcome to the forums !

It's not the flame sensor as the burner needs to be lit for a few seconds before it activates.

Can you post the model number of your furnace.
 
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Old 03-07-13, 06:46 PM
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If what I think I see is correct, one burner lites but the remaining burners are failing to light.

The first burner should ignite the remaining ones. There is probably a blockage which may require the burners to be removed and cleaned of any obstructions.
 
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Old 03-07-13, 07:53 PM
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G32Q3-75-3

the right burner is igniting and when the cover is on and I look through the window, I see the other two flame up briefly before it goes out.
 
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Old 03-07-13, 09:45 PM
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The link is for the service manual for your unit. I don't know enough about this furnace to tell you whether or not cleaning the burner assembly is a DIY'er project. Page 32 discusses burner cleaning and further down in the 50's are the diagnostic charts.

http://hvacpartsshop.net/G32Q_Series.pdf

HVACtech will stop by and give his take on the problem.
 
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Old 03-08-13, 04:58 AM
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You do need to clean the burner faces and crossovers. To do this you have take the burner manifold out of the way (kind of a pain). If you cant figure it out or feel itis over your head then you should call a few contractors and get a price for burner cleaning.
 
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Old 03-08-13, 02:03 PM
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Thanks for the help guys. I think I'm going to have to call someone out. I appreciate the responses.
 
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