HVAC Serial Number Lookup
LG Serial Number Lookup
LG is part of the LG. Enter the serial from the data plate below to get the manufacture date with a character-by-character explanation, the unit's age, its refrigerant era, and the warranty picture.
Decode schemes compiled from manufacturer literature and inspector references, cross-checked across two sources wherever possible (LG sources: building-center.org + howtolookatahouse). Single-sourced rules are labeled low confidence instead of being presented as fact. A date stamped or printed on the data plate always outranks a serial decode.
LG Serial Number Formats
| Format | Era | Example | Confidence |
|---|---|---|---|
| First digit = last digit of the year (decade not encoded), digits 2-3 = month 01-12 | ~2007 to present | 705KWPZ64912 = May of a year ending in 7 (2007 or 2017) | medium |
Some older or conflicting LG formats are recognized but deliberately not decoded; the decoder explains why when it sees one instead of guessing.
Worked Example: LG 705KWPZ64912
Expected decode: May of a year ending in 7 (2007 or 2017). Character by character:
7 = last digit of the year (decade not encoded): 2017 shown
05 = May (digits 2-3)
Decade not encoded; disambiguate via the refrigerant, the model generation, or the production date printed on the tag.
7 = last digit of the year (decade not encoded): 2007 shown
05 = May (digits 2-3)
More than one reading passes the validity checks for this serial, so all of them are shown, ranked, instead of a single guess.
LG Refrigerant Timeline
| Manufacture year | Typical refrigerant | Notes |
|---|---|---|
| through 2024 | R-410A | LG US residential and light-commercial systems ran R-410A through 2024. |
| 2025 and later | R-32 | LG chose R-32 for US split systems, VRF, and chillers from 2025. |
The refrigerant printed on the nameplate is authoritative; this timeline tells you what is typical for the age, not what is in a specific unit.
LG Warranty Baseline
Standard: 5-year parts / 7-year compressor. Qualified registered systems: 10 / 10. LG Excellence Contractor install adds 2 years (12 / 12).
Source: lghvac.com/warranty-page. Decode the manufacture date above, then confirm coverage through the manufacturer's own serial-number warranty lookup.
Frequently Asked Questions
How old is my LG unit?
Decode the serial number from the data plate. The dominant LG format (~2007 to present) is: First digit = last digit of the year (decade not encoded), digits 2-3 = month 01-12. Example: 705KWPZ64912 decodes to May of a year ending in 7 (2007 or 2017). Subtract the decoded year from the current year for the age. Units past 15 years are replacement candidates, and past 20 a major repair rarely pays off.
Why can a LG serial number decode to more than one date?
The main LG rule carries medium confidence, so treat the result as an estimate to check against the data plate. Decade not encoded; disambiguate via the refrigerant, the model generation, or the production date printed on the tag.
What refrigerant does a LG unit use?
By manufacture year: through 2024: R-410A; 2025 and later: R-32. The refrigerant printed on the nameplate is authoritative; the year-based mapping tells you what is typical for the age, not what is in a specific unit.
Is my LG unit still under warranty?
Standard: 5-year parts / 7-year compressor. Qualified registered systems: 10 / 10. LG Excellence Contractor install adds 2 years (12 / 12). Decode the manufacture date above, then confirm coverage by running the full serial through the manufacturer's own warranty lookup. Terms shown are the current policy; older units often carried different terms.
Why do some LG serial numbers refuse to decode?
This legacy LG format is documented by a single source with an internally inconsistent position spec, so this tool does not decode it. Check the production date printed on the tag.
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