Furnance Won't Work...question About Lennox G43UF - HVAC - DIY Chatroom Home Improvement Forum

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Old 10-08-2009, 10:32 PM   #1
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Furnance won't work...question about Lennox G43UF

I tried to turn the furance on this year and it wouldn't work. Realized the combustion air inducer wasn't working. Investigated and a bird was stuck inside. After removing the bird, here's what happens.

combustion air inducer energizes, then the burners turn orange (I guess they are lighting), then after about 30 seconds they turn off. This happens about 5 times and then the LED# 1 and LED #2 both alternate flash meaning Watchguard - burners failed to ignite or lost flame.

So after removing the bird, I must have screwed something up. I've read some things about:

cleaning the sensor - how do I do that?
control board issues - but seems like that wasn't the root cause, that the bird stuck was the issue.

Any ideas?


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Old 10-08-2009, 10:45 PM   #2
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flame sensor is a metal rod in front of your far right or far left burner, remove it and clean with fine sandpaper or some perfer to use steel wool. do you see the burners lite or just the ignitor glowing. did you turn the gas off accidentally on the gas valve?


Last edited by HvacWiz; 10-08-2009 at 10:48 PM.
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Old 10-08-2009, 11:02 PM   #3
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We turned the gas off, but then turned it back on. How can I tell the difference in the burners lighting and the ignitor burning organge?
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Old 10-09-2009, 08:10 PM   #4
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The burners shoot a blue flame into the heat exchanger ad there should be 2 or more of them. Did you bump/damage the wiring to the gas valve. Sounds like it is not getting energized.
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Old 10-09-2009, 09:21 PM   #5
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May also have another critter in the vent pipe which is causing a pressure switch fault.
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