Also check to see that the burners are clean in front of the flame sensor. The board sends a milliamp signal through the flame sensor and to a ground, which should be the burners in front of it. Flame will conduct this signal and gas won?t. That?s how the board knows the gas is ignited, by sensing the completed circuit. When I was in the field anytime I changed an igniter or cleaned a flame sensor I always took out the burners and cleaned them too. I would not use sand paper or like material to clean the sensor as it will start to groove the sensor and stop working well quicker as the junk builds up. I use a steel brush from my cleaning kit. As others have said, it sounds like a poor ground somewhere.


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