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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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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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