How old is my Daikin heat pump?

Serial number age decoder for Daikin heat pumps: 2 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

• Daikin heat pump serial numbers in the 2012 to present format encode the year as digits 1-2 (YY) and the month as digits 3-4 (source: building-center.org).
• Example: serial 1602393269 decodes to February 2016.
• Daikin heat pump serial numbers in the 1977 to 1989 format encode the year as digit 3 = last digit of year (9 = 1979, 0 = 1980, 1 = 1981, 2 = 1982 ...); decade by era (late 1970s-1980s) and the week as digits 4-5 (source: building-center.org).
• Example: serial 049270032 decodes to week 27 of 1979 or 1989.
• The 1977 to 1989 format is ambiguous: Auburn-built McQuay incremental/heat pump units (models EA, EAB, K, EK, EKG, JB, WM, CC, FV). Single year digit; 9-digit numeric collides with other brands.
• Daikin's official lookup at warranty.goodmanmfg.com returns entitlement.

Format eras

• 2012 to present VERIFIED
  ##########digits 1-2 (YY)
• 1977 to 1989 VERIFIED
  #########digit 3 = last digit of year (9 = 1979, 0 = 1980, 1 = 1981, 2 = 1982 ...); decade by era (

How to read the serial

2012 to present formatVERIFIED

Shape ########## · example 1602393269 · confidence high

Year

digits 1-2 (YY)

Week or month

month = digits 3-4

Example: serial 1602393269 decodes to February 2016.

1977 to 1989 formatVERIFIED

Shape ######### · example 049270032 · confidence medium

Year

digit 3 = last digit of year (9 = 1979, 0 = 1980, 1 = 1981, 2 = 1982 ...); decade by era (late 1970s-1980s)

Week or month

week = digits 4-5

Plant

digits 1-2 = unit type

Example: serial 049270032 decodes to week 27 of 1979 or 1989.

Where the data plate is on a heat pump

On the outdoor unit, same place as a condenser: a plate on the side or back of the cabinet near the line set. The indoor air handler carries its own plate with its own serial.

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 Heat Pump at 10 to 15 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

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: DAIKIN10-HVAC-Age.png (Daikin Manufacturing Co. plate photo)
• img: DAIKIN4-HVAC-Age.png (ref McQuay 55205900.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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