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 before...so I am assuming it is something to do with the new board. Any ideas? Thanks. Garry
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Terminology
When you say "common" ... I take it that can mean connect ground wire from a "neutral" lead to the chassi. There is another empty lead called "park" ... Thanks. Garry
When you say "common" ... I take it that can mean connect ground wire from a "neutral" lead to the chassi. There is another empty lead called "park" ... Thanks. Garry
Fixed! Thanks.
Beenthere, Yuri. I switched the two secondary wires from the transformer around on the board and furnance is now working. THANKS! Garry
Beenthere, Yuri. I switched the two secondary wires from the transformer around on the board and furnance is now working. THANKS! Garry
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