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Old 01-21-2013, 08:42 PM   #1
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low flame signal


my lennox model #c23-41wfc-1 wasnt working code flash showed burners failed to ignight.turned off power ,then on, it working now but showing low flame signal.what to do now?

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Old 01-21-2013, 09:10 PM   #2
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low flame signal


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Originally Posted by wd45gto View Post
my lennox model #c23-41wfc-1 wasnt working code flash showed burners failed to ignight.turned off power ,then on, it working now but showing low flame signal.what to do now?
Your flame sensor needs to be cleaned. It's the metal rod on the opposite side of the burners as the ignitor. There should be just one screw holding it in. Remove the screw, pull out the flame sensor. Brush it with a wire brush or piece of steel wool. Put it back in. That should stop the low flame sense code.

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Old 01-22-2013, 03:46 PM   #3
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low flame signal


Just a FYI the c23 number is the evap coil for the air conditioner. The furnace model number will be located on a sticker which you'll need to remove the doors to the furnace to see. Gas will start with a G and oil will start with an O in the model number. The answer is still the same though,clean the flame sensor. If the front of the burners have any rust those should be removed and also cleaned.
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Old 01-22-2013, 06:57 PM   #4
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low flame signal


thank you both. working good now
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