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Lennox intermitent flame problem

I have a lennox furnace without a pilot lite, it will glow and the flame will start and then shut off immediatly, sometimes it works fine and then it has problems. The warning lights give me a warning that it didn't sense a flame, is this a flame sensor issue?

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Yes the flame sensor is not allowing the ignitor to start, you will need to remove the flame sensor, and clean the black carbon build up from the stem of the flame sensor, replace the flame sensor and turn the furnance back on, this will correct the problem.

Posted on Dec 14, 2009

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I've got an easy way for you to check, and then we can help you from there.
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and there are some oddballs in between, particularly the Lennox Pulse. If that's your furnace just back away slowly and call a professional... some guys won't even touch those, so be sure to mention what it is... if you call a pro.

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Sounds like a dirty flame sensor.
Also 9 degrees is a large swing to recover. Most specialist will advise no more than a 5 degree set back, otherwise recovery time eliminates any savings you may achieve.

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