How old is my Sub-Zero refrigerator?

Serial number age decoder for Sub-Zero refrigerators: 1 format era, the decode rule in plain English, transcribed tables, and the official lookup.

Sub-Zero's official lookup at subzero-wolf.com returns warranty / registration lookup.

Format eras

era not stated VERIFIED
no date in serialNOT encoded in the serial. Sub-Zero prints the manufacture date in a separate 'Date Code'

How to read the serial

era not stated formatVERIFIED

Year: NOT encoded in the serial. Sub-Zero prints the manufacture date in a separate 'Date Code' field on the serial tag (bottom-right corner before April 2020, upper-right after April 2020); Cove dishwashers print it under 'MFG' (bottom right)
Week or month: read the Date Code field

Documented but not evaluated by the decoder: no pattern (no date encoded, or format unknown).

Trap: Official Sub-Zero/Wolf/Cove answer page: tags 'may or may not list the date of manufacture'; for a unit without one, contact Customer Care (800-222-7820, customerservice@subzero.com) with the serial. Building-center confirms 'no formal coding built into their serial numbers'. Third-party blogs claiming 'first digit = year' are unsourced - do not ship them.

Where the data plate is on a refrigerator

Inside the fresh-food compartment: on a side wall, the ceiling, or behind the crisper drawers.

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 Refrigerator at 9 to 13 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

Official lookup: the authority

Open the official Sub-Zero lookup takes serial number; returns warranty / registration lookup; URL verified live

This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.

What we could not confirm

The era not stated format is documented but not decodable here: no pattern (no date encoded, or format unknown).
Official answer: manufacture date is printed as a separate 'Date Code' on the tag (position moved April 2020); the serial itself is not decodable by the public - call Customer Care. Building-center's Wolf/Sub-Zero page agrees (no formal coding).