Trying to understand your York Furnace or Air Conditioner's Serial number?
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This chart is good for units up to 2004..
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This information applies to 2004 to Present...
YORK(October 2004 to Present)
Date of Manufacture (October 2004 to Present): The manufacturing date code is the second and third and fourth digits of the serial number. (To determine month: A = Jan; B = Feb; C = Mar; D = Apr; E = May; F = Jun; G = Jul; H = Aug; I was not used; J was not used; K = Sep; L = Oct; M = Nov; and N = Dec.).
To determine the year of manufacture combine the 2nd and 4th digits of the serial number.
Year
2nd Digit
4th Digit
2004 would have 0 as the second digit and 4 as the fourth digit (04)
2005 would have 0 as the second digit and 5 as the fourth digit (05)
20012 would have 1 as the second digit and 2 as the fourth digit (12)... ect
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