The third letter indicates the year of manufacture but, because the letter series repeated every 21 years, some letters will require you to look at the condition of the system or find the year of any industry standard referenced in the fine print of the data plate to determine which of the two years that used the same letter it is. So, for example, the serial number below beginning with “W1D5” indicates that the condenser was manufactured in 2015.Īnd here’s an example from a York furnace manufactured in 2009.Īn earlier serial number system, that was used until October 2004, has a sequence of four letters followed by a string of six numbers. For York systems manufactured from October 2004 to the present, the first and third characters in the serial number will be letters, and the second and fourth characters will be numbers that indicate the year of manufacture.
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