How old is my York packaged unit?
Serial number age decoder for York packaged rooftop and ground units: 1 format era, the decode rule in plain English, transcribed tables, and the official lookup.
Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.
Format example: W0K5896070
- York packaged unit serial numbers in the 2004 to present format encode the year as digit 2 + digit 4 concatenated (0+5 = 2005) and the month as letter 3 (table below) (source: building-center.org).
- Example: serial W0K5896070 decodes to September 2005.
- York's official lookup at york.bosch-hcgroup.com returns warranty details ('HVAC WARRANTY LOOKUP').
Format eras
- 2004 to present VERIFIED
A#A#######digit 2 + digit 4 concatenated (0+5 = 2005)
How to read the serial
2004 to present formatVERIFIED
Shape A#A####### · example W0K5896070 · confidence high
- Year
- digit 2 + digit 4 concatenated (0+5 = 2005)
- Week or month
- month = letter 3: A=Jan B=Feb C=Mar D=Apr E=May F=Jun G=Jul H=Aug K=Sep L=Oct M=Nov N=Dec
- Plant
- letter 1: A=Apodaca N=Norman S=Source One W=Wichita
| Month code | Month |
|---|---|
| A | January |
| B | February |
| C | March |
| D | April |
| E | May |
| F | June |
| G | July |
| H | August |
| K | September |
| L | October |
| M | November |
| N | December |
| Plant code | Plant |
|---|---|
| A | Apodaca |
| N | Norman |
| S | Source One |
| W | Wichita |
Example: serial W0K5896070 decodes to September 2005.
Where the data plate is on a packaged unit
On the cabinet exterior near the electrical access panel, or inside the panel door.
General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.
Open the official York lookup takes serial; returns warranty details ('HVAC WARRANTY LOOKUP'); URL partial
This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.
Sources
- https://www.building-center.org/york/
- img: YORK-Serial-Number-Style-1.jpg (transcribed)
- https://york.bosch-hcgroup.com/residential-equipment/warranty-and-registrationofficial
Frequently asked questions
How do I tell the age of a York packaged unit from the serial number?
In the 2004 to present format the year is digit 2 + digit 4 concatenated (0+5 = 2005) and the month as letter 3 (table below). Example: serial W0K5896070 decodes to September 2005.
Where is the serial number on a York packaged unit?
On the data plate. On the cabinet exterior near the electrical access panel, or inside the panel door.