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-   -   Lennox furnace serial 6396j0178 model 80mfg3-75a-5 (http://www.diychatroom.com/f17/lennox-furnace-serial-6396j0178-model-80mfg3-75a-5-a-170869/)

Minderella 02-02-2013 10:07 PM

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.

diyorpay 02-02-2013 10:26 PM

A cleaning probably will buy time. Video: http://www.youtube.com/watch?v=I86joWL66aE Clean with emery cloth, not sand paper.

Minderella 02-03-2013 07:20 AM

already cleaned...
 
It's been cleaned twice. Yesterday, cleaned again. Worked for a couple hours and than started shutting down again.

Marty S. 02-03-2013 08:00 AM

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.

yuri 02-03-2013 09:11 AM

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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