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Old 02-02-2013, 10:07 PM   #1
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Lennox furnace serial 6396j0178 model 80mfg3-75a-5


From what I can tell, I believe I need a new flame sensor. Everything starts up, but than when the flames kick on everything turns off.

Suggestions? Does this sound right?

Thanks.

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Old 02-02-2013, 10:26 PM   #2
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Lennox furnace serial 6396j0178 model 80mfg3-75a-5


A cleaning probably will buy time. Video: Clean with emery cloth, not sand paper.


Last edited by diyorpay; 02-02-2013 at 10:28 PM.
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Old 02-03-2013, 07:20 AM   #3
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Lennox furnace serial 6396j0178 model 80mfg3-75a-5


It's been cleaned twice. Yesterday, cleaned again. Worked for a couple hours and than started shutting down again.
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Old 02-03-2013, 08:00 AM   #4
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Lennox furnace serial 6396j0178 model 80mfg3-75a-5


The flame sensor is just a steel rod with a ceramic insulator. If the ceramic isn't cracked and the rod is clean than the problem is not the flame sensor. Rust on the end of the burners or a poor ground will also interfere with the control boards ability to sense flame being present.
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Old 02-03-2013, 09:11 AM   #5
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Lennox furnace serial 6396j0178 model 80mfg3-75a-5


espicially with that furnace. I have even had to run a green groundwire from one of the screws on the burner box directly to the circuit board ground to make them work better.
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Last edited by yuri; 02-03-2013 at 09:15 AM.
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