How old is my LG mini split?

Serial number age decoder for LG mini splits: 2 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

• LG mini split serial numbers in the 2000 to present format encode the year as position 1 = last digit of year (2 = 2012 or 2022); decade NOT distinguished - use the plate's printed manufacture date or model era. A 13-char variant carries two year digits (1201KAPB00104 = Jan 2012) and the month as positions 2-3 (01-12) (source: building-center.org).
• Example: serial 207KRMK0Y171 decodes to 2002 or 2012 or 2022 (July).
• The 2000 to present format is ambiguous: Decade ambiguity (407HAVN79423 = Jul 2024 or Jul 2014; plate said 2024). Regex tolerates the 2-digit-year variant; a decoder must reject month > 12.
• LG mini split serial numbers in the before 2012 format encode the year as positions 6-9 = 4-digit year and the month as position 10 (1-9, A=Oct, B=Nov, C=Dec); day as positions 11-12 (source: building-center.org).
• Example: serial EQ11220013150001 decodes to March 2001.
• LG's official lookup at lghvac.com returns warranty / registration lookup.

Format eras

• before 2012 VERIFIED
  AA##############positions 6-9 = 4-digit year
• 2000 to present VERIFIED
  ###AAAA#A###position 1 = last digit of year (2 = 2012 or 2022); decade NOT distinguished - use the pla

How to read the serial

before 2012 formatVERIFIED

Shape AA############## · example EQ11220013150001 · confidence medium

Year

positions 6-9 = 4-digit year

Week or month

month = position 10 (1-9, A=Oct, B=Nov, C=Dec); day = positions 11-12

Plant

positions 1-2 = buyer code, 3-4 = model code, 5 = line number

Example: serial EQ11220013150001 decodes to March 2001.

2000 to present formatVERIFIED

Shape ###AAAA#A### · example 207KRMK0Y171 · confidence high

Year

position 1 = last digit of year (2 = 2012 or 2022); decade NOT distinguished - use the plate's printed manufacture date or model era. A 13-char variant carries two year digits (1201KAPB00104 = Jan 2012).

Week or month

month = positions 2-3 (01-12)

Example: serial 207KRMK0Y171 decodes to 2002 or 2012 or 2022 (July).

Where the data plate is on a mini split

Two plates: one on the side of the outdoor unit, one on the indoor head (lift the front cover or look under the unit). The two serials differ; decode the outdoor unit for the system age.

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

• HVAC and appliances share one style: position 1 = last digit of year, positions 2-3 = month (207KRMK0Y171 on an LG refrigerator plate stamped MANUFACTURED 2012.07; 407HAVN79423 on a 2024 mini-split). Decade must be inferred; newer plates print the manufacture date. Building-center's LG APPLIANCE page mislabels positions 2-3 as 'week' but its own plate photo (2012.07) proves month. lghvac.com/warranty-page/ = 200 (warranty terms, not a serial lookup); lg.com/us/support = 200. LG's own help-library article on manufacture dates could not be located this session (search budget exhausted).

Sources

• https://www.building-center.org/lg-hvac-age/
• https://www.building-center.org/lg-appliances/
• img: LG-1-Serial-Number.jpg, lg-tag-2.jpg (plate: 207KRMK0Y171 / MANUFACTURED 2012.07)
• img: LG-2-Serial-Number.jpg
• https://lghvac.com/warranty-page/official

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