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Recently bought a replacement control board for my 14 year old York furnance. The replacement part number is 21-33102956000. I am getting a repeating "nine red blinks" on the LED error indicator. Tha means polarity or grounding problem. My old board grounded through a screw that connected the board to the sheet metal brace. The hole in the old board had a metal tab (labeled on board as ground) in the screw hole...establishing the ground. I don't see a similar grounding mechanism for my new board. I never had the grounding error code I am assuming it is something to do with the new board. Any ideas? Thanks. Garry
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