How old is my York unit?
York is part of Bosch Home Comfort (ex Johnson Controls / Unitary Products). 2 serial formats sourced across central air conditioner, heat pump, furnace, packaged unit.
Serial number decoder for York
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 air conditioner 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 air conditioner serial numbers in the 1971 to 2004 format encode the year as letter 3 via 21-letter table (table below) and the month as letter 2 (A-N, I/J skipped like style 1) (source: building-center.org).
- Example: serial WAKM011379 decodes to 1980 or 2001 (January).
- The 1971 to 2004 format is ambiguous: Letters A-N repeat (1971-1984 vs 1992-2004): 21-year cycle. Some serials carry a parenthesized leading letter e.g. (S)EBHM062202 - ignore it. Style ran to Oct 2004, so 2004 has BOTH styles.
- York's official lookup at york.bosch-hcgroup.com returns warranty details ('HVAC WARRANTY LOOKUP').
Decoder pages by product
Format eras
- 2004 to present VERIFIED
A#A#######Central Air Conditioner, Heat Pump, Furnace, Packaged Unit - 1971 to 2004 VERIFIED
AAAA######Central Air Conditioner, Heat Pump, Furnace
Official lookup: the authority
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)
- img: YORK-Serial-Number-Style-2.jpg (transcribed)
- https://york.bosch-hcgroup.com/residential-equipment/warranty-and-registrationofficial