How old is my Champion air conditioner?

Serial number age decoder for Champion central air conditioners: 2 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

• Champion 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.
• Champion 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.
• Champion'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)
• 1971 to 2004 VERIFIED
  AAAA######letter 3 via 21-letter table: A=1971/1992 B=1972/1993 C=1973/1994 D=1974/1995 E=1975/1996

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

Example: serial W0K5896070 decodes to September 2005.

Listed under York in the source; Champion is named in that format's family.

1971 to 2004 formatVERIFIED

Shape AAAA###### · example WAKM011379 · confidence high

Year

letter 3 via 21-letter table: A=1971/1992 B=1972/1993 C=1973/1994 D=1974/1995 E=1975/1996 F=1976/1997 G=1977/1998 H=1978/1999 J=1979/2000 K=1980/2001 L=1981/2002 M=1982/2003 N=1983/2004 P=1984 R=1985 S=1986 T=1987 V=1988 W=1989 X=1990 Y=1991

Week or month

month = letter 2 (A-N, I/J skipped like style 1)

Plant

letter 1: A=Addison B=Blackville C=Canada D=Medina E=Elyria M=Madville N=Norman W=Wichita X=Mexico Y=York

Example: serial WAKM011379 decodes to 1980 or 2001 (January).

Listed under York in the source; Champion is named in that format's family.

Where the data plate is on an air conditioner

On the outdoor condenser: a metal or foil plate on the side or back of the cabinet, often near the refrigerant line connections. Some brands repeat it inside the electrical access panel.

General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.

For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Air Conditioner (central) at 7 to 15 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

What we could not confirm

• UNSOURCED for dating: championpowerequipment.com/faq/ (200) only says the serial is on the owner's-manual cover or a silver/white sticker on the frame; no date code published.

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
• https://www.championhomecomfort.com/residential-equipment/warranty-and-registrationofficial

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