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Hi I'm Brian and I'm here to help!
A Scotchbrite pad is the best way to clean a flame rod. Make sure there is nothing on the ceramic part of the flame rod as this can bleed current to ground and stop the current from getting to the control. A good solid ground is also very important to the furnace and to the controller itself. Flame rectification depends on a good ground all the way through the circuit! Of course in order for the flame rod to send enough current to the control, the rod must be in a good steady and solid blue flame!
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