How old is my Daikin packaged unit?

Serial number age decoder for Daikin packaged rooftop and ground units: 3 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

• Daikin packaged unit serial numbers in the era not stated format encode the year as digits 5-6 (YY, after the 4 prefix letters) and the month as digits 7-8 (source: building-center.org).
• Example: serial FBOU0905048200 decodes to May 2009.
• Daikin packaged unit serial numbers in the 1995 to 1999 format encode the year as digit 2 = last digit of year, 1995-1999 only (5=1995 ... 9=1999) and the month as letter 3 (A=Jan..M=Dec, I skipped) (source: building-center.org).
• Example: serial 55A1234501 decodes to January 1995.
• Daikin packaged unit serial numbers in the 1971 to 1994 format encode the year as letter 2 (table below) and the month as letter 3 (A=Jan..M=Dec, I skipped) (source: building-center.org).
• Example: serial 5PB1234503 decodes to February 1984.
• Daikin's official lookup at warranty.goodmanmfg.com returns entitlement.

Format eras

• 1995 to 1999 VERIFIED
  ##A#######digit 2 = last digit of year, 1995-1999 only (5=1995 ... 9=1999)
• 1971 to 1994 VERIFIED
  #AA#######letter 2: A=1971 B=1972 C=1973 D=1974 E=1975 F=1976 G=1977 H=1978 J=1979 K=1980 L=1981 M=1
• era not stated VERIFIED
  AAAA##########digits 5-6 (YY, after the 4 prefix letters)

How to read the serial

1995 to 1999 formatVERIFIED

Shape ##A####### · example 55A1234501 · confidence high

Year

digit 2 = last digit of year, 1995-1999 only (5=1995 ... 9=1999)

Week or month

month = letter 3 (A=Jan..M=Dec, I skipped)

Plant

digit 1: 1 = Minneapolis MN, 3 = Faribault MN, 4 = Grenada MS, 5 = Staunton VA, 9 = Scottsboro AL

Example: serial 55A1234501 decodes to January 1995.

1971 to 1994 formatVERIFIED

Shape #AA####### · example 5PB1234503 · confidence high

Year

letter 2: A=1971 B=1972 C=1973 D=1974 E=1975 F=1976 G=1977 H=1978 J=1979 K=1980 L=1981 M=1982 N=1983 P=1984 Q=1985 R=1986 S=1987 T=1988 U=1989 V=1990 W=1991 X=1992 Y=1993 Z=1994 (I and O skipped)

Week or month

month = letter 3 (A=Jan..M=Dec, I skipped)

Plant

digit 1: 1 = Minneapolis, 3 = Faribault, 4 = Grenada, 5 = Staunton, 7 = Spirit Lake IA / Auburn

Example: serial 5PB1234503 decodes to February 1984.

era not stated formatVERIFIED

Shape AAAA########## · example FBOU0905048200 · confidence high

Year

digits 5-6 (YY, after the 4 prefix letters)

Week or month

month = digits 7-8

Plant

letters 1-3: FBO = Faribault MN, SCO = Scottsboro AL, STN = Staunton VA; letter 4 = unit style

Example: serial FBOU0905048200 decodes to May 2009.

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.

What we could not confirm

• building-center lists 10 styles; most are Daikin-McQuay (Daikin Applied) commercial formats, referenced to McQuay replacement-parts manuals. Houston-built Daikin-brand residential units (Daikin Manufacturing Company L.P.) use the Goodman YYMM###### style (style 10). Japan/Thailand-built ductless & VRV serials (e.g. 7-digit A000129) do NOT encode the date; read the MFG. DATE printed on the plate (style 1). Warranty lookup URL returned 200 this session (sources/daikincomfort_com_...html).

Sources

• https://www.building-center.org/daikin-hvac-age/
• img: DAIKIN2-HVAC-Age.jpg (ref McQuay parts list 552250.pdf)
• img: DAIKIN5-HVAC-Age.png (ref McQuay 552250.pdf)
• img: DAIKIN6-HVAC-Age.png (ref McQuay 552316.PDF, 55210900.pdf)
• https://warranty.goodmanmfg.com/entitlement/GenericEntitlementLookup.htm?site=Daikinofficial
• https://daikincomfort.com/my-daikin-systems/standard-warranty-information/warranty-lookupofficial

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